CN106576108A - Communication method and device, and system in communication system - Google Patents

Abstract

A communication method in a communication system, which is used for solving the technical problem that a large amount of TCP information needs to be synchronized in real time between a main and a backup controller in an existing SDN, resulting in a heavy burden of the main and the backup controller, thereby affecting system performance. Also provided are a corresponding device and system. In some feasible embodiments of the present invention, the communication system comprises a main controller, a backup controller, a forwarder and a network device, wherein the forwarder is used for receiving a packet of the main controller and forwarding same to the network device, or receiving a packet of the network device and forwarding same to the main controller. The method comprises: after receiving a packet from a main controller or a network device, a forwarder buffering the received packet; monitoring a processing state of the buffered packet, and deleting a processed packet in the buffered packet; and when a backup controller switches to a new main controller, sending an unprocessed packet in the buffered packet to the new controller.

Description

Communication method and device and system in communication system technical field

The present invention relates to the technical field of communication, in particular to a communication method, equipment and system in a communication system.

Background technique

Software Defined Network (SDN) is an implementation of network virtualization. Its core technology, OpenFlow, realizes flexible control of network traffic by separating the control plane of network equipment from the data plane, making the network as a Pipelines just got smarter. SDN strips all high-level processing functions of the switch except traffic forwarding, and moves this part of high-level processing functions to a separate device, the controller. The switch and the controller use a control channel protocol (such as the OpenFlow protocol) to communicate, the controller issues control commands, and the switch is responsible for receiving commands and forwarding corresponding data.

In order to improve the reliability of the controllers in the SDN, it is generally necessary to deploy dual controllers, wherein the primary controller completes service processing, and the standby controller acts as a backup. When the primary controller fails, the standby controller replaces the primary controller in real time to perform business processing; during the whole process, the peer device communicating with the primary and secondary controllers does not perceive the switching process of the primary and secondary controllers.

In the existing technical solution, the reliability of the protocol based on the TCP connection is realized by synchronizing TCP (Transmission Control Protocol, Transmission Control Protocol) message information between the active and standby controllers in real time. In order to realize the protection function of the active and standby controllers, the peer device that communicates with the controller based on the protocol of the TCP connection does not perceive the switching process of the active and standby controllers, and the standby controller needs to monitor the protocol packets in real time.

Practice has found that this solution requires a large amount of TCP information to be synchronized between the active and standby controllers in real time. The burden on the server is heavy, which has a great impact on the performance of the entire system.

Contents of the invention

Embodiments of the present invention provide a communication method, device, and system in a communication system to solve the problem that a large amount of TCP information needs to be synchronized in real time between the active and standby controllers in the existing SDN, resulting in heavy burden on the active and standby controllers. Heavy, technical issues affecting system performance.

The first aspect of the present invention provides a communication method in a communication system, the communication system includes a master controller, a backup controller, a repeater and a network device, the repeater is located between the master controller and the network device During the interval, it is used to receive the message of the main controller and forward it to the network device, or receive the message of the network device and forward it to the main controller, the method includes: the forwarder receiving After receiving the message from the main controller or the network device, cache the received message; the forwarder monitors the processing status of the cached message, and deletes the cached message A message that has been processed; when the standby controller is switched to a new master controller, the forwarder sends the messages that have not been processed in the buffered messages to the new master controller.

With reference to the first aspect, in a first possible implementation manner, the forwarder monitors the processing status of the buffered messages, and deleting the processed messages in the buffered messages includes: the forwarder receiving an indication value sent by the main controller or the network device for indicating the processed message, and deleting the processed message in the buffered messages according to the indicated value.

With reference to the first possible implementation of the first aspect, in the second possible implementation, the message is a transmission control protocol TCP message, and the message received by the cache includes: the forwarder according to The source IP address, destination IP address, source port and destination port in the message header of the received message confirm the corresponding TCP connection; the forwarder determines the message based on the confirmed TCP connection The TCP sequence number of the received message is cached and the TCP sequence number of the received message is cached.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner, the cached message includes an inbound message sent by the network device to the main controller, and the forwarding The device monitors the processing status of the buffered messages, and deleting the processed messages in the buffered messages includes: the forwarder receives the response message returned by the master controller, and the response message includes: Include a first indication value, the first indication value indicates the TCP sequence number of the end byte of the last inbound message that the main controller has processed; the forwarder from the cached message, Deleting at least one incoming packet whose TCP sequence number of the end byte is not greater than the first indication value.

With reference to any one of the first to third possible implementation manners of the first aspect, in a fourth possible implementation manner, the cached message includes out of Direction message, the forwarder monitors the processing status of the cached message, and when it is determined that at least one message in the cached message has been processed, the processed message in the cached message Deleting at least one message includes: the forwarder receiving a feedback message returned by the network device, the feedback message including a second indication value, the second indication value indicating the next outbound direction that the network equipment expects to receive The TCP sequence number of the message; from the buffered messages, delete at least one outbound message whose TCP sequence number of the end byte is smaller than the second indication value.

With reference to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner, the method further includes: the forwarder sends a response message to the main controller, and the response message includes the The TCP sequence number of the end byte of the last outgoing message in the cached message; the forwarder receives the notification message sent by the master controller, and the notification message includes a third indication value, the The third indication value indicates the TCP sequence number of the end byte of the last outbound message that the main controller has processed; the TCP sequence number of the end byte from the buffered message is less than the Deleting at least one outbound packet of the second indication value includes: from the cached message, at least An outgoing packet is deleted.

In combination with any one of the first to fifth possible implementations of the first aspect, in a sixth possible implementation, the data part of the TCP message includes a sub-message, and the sub-message It is a Border Gateway Protocol BGP packet or a Label Distribution Protocol LDP packet.

With reference to any one of the second to fifth possible implementations of the first aspect, in a seventh possible implementation, the buffering of the received message and the received message The TCP sequence numbers include: the forwarder caches the received packets after sorting them according to the TCP sequence numbers.

With reference to any one of the first to seventh possible implementation manners of the first aspect, in an eighth possible implementation manner, the buffering the received message includes: the forwarder receives the When the main controller or the network device retransmits the message, cache the retransmitted message; when the standby controller is switched to a new main controller, the forwarder will store the cached Sending the message that has not been processed in the message to the new master controller includes: when the standby controller is switched to the new master controller, if the retransmitted message is a message that has not been processed, The forwarder sends the retransmitted message and the original message of the retransmitted message to the new main controller together.

With reference to the fourth or fifth possible implementation of the first aspect, in a ninth possible implementation, the method further includes: the forwarder, according to the Fragmentation flag bit, identifying whether the received outgoing direction message is a fragment of a complete TCP message; The network device forwards the fragments of the complete TCP message.

The second aspect of the present invention provides a communication method in a communication system, the communication system includes a master controller, a standby controller, a repeater and a network device, the repeater is located between the master controller and the network device During the period, it is used to receive the message of the main controller and forward it to the network device, or receive the message of the network device and forward it to the main controller, and the method includes: the main controller receives The forwarder forwards the message from the network device, and processes the received message; the main controller sends an indication value to the forwarder to indicate the message that has been processed.

With reference to the second aspect, in a first possible implementation manner, the message is a transmission control protocol TCP message, and the main controller sends the main controller to the forwarder to indicate that the processing has been completed The indication value of the message includes: the main controller sends a response message to the transponder, the response message includes a first indication value, and the first indication value indicates that the main controller has processed the last The TCP sequence number of the end byte of a TCP message, the response message is used by the forwarder to save the TCP sequence number of the end byte in the TCP message cached by itself at least not greater than the first indication value A TCP packet is deleted.

In combination with the second aspect or the first possible implementation of the second aspect, in the second possible implementation, the data part of the TCP message includes a sub-message, and the sub-message is a border gateway protocol BGP packets, or Label Distribution Protocol LDP packets.

With reference to the second possible implementation of the second aspect, in a third possible implementation, the main controller processing the received TCP message includes: removing the header of the TCP message , obtaining the data part of the TCP message; recovering a complete sub-message from the data part of the TCP message; and performing persistent processing on the sub-message.

The third aspect of the present invention provides a communication method in a communication system, the communication system includes a master controller, a standby controller, a repeater and a network device, the repeater is located between the master controller and the network device time, used to receive the message of the master controller and forward it to the network device, or receive Receive the message of the network device and forward it to the main controller, the method includes: the main controller sends a message to the forwarder, and the sent message is used for buffering by the forwarder and then forwarded to the main controller The network device sends the message; the main controller processes the sent message; the main controller sends an indication value for indicating the message that has been processed to the forwarder.

With reference to the third aspect, in a first possible implementation manner, the message is a Transmission Control Protocol TCP message, and processing the message by the main control includes: receiving, by the main control, the message sent by the forwarder. A response message, the response message includes the TCP sequence number of the end byte of the last TCP message that the forwarder has cached; the master control processes the TCP message according to the response message; The main controller sending the indication value of the main controller to the forwarder to indicate that the message has been processed includes: the main controller sends a notification message to the forwarder, and the notification message includes The third indication value, the third indication value indicates the TCP sequence number of the end byte of the last TCP message that the main controller has processed, and the notification message is used by the forwarder to forward the buffered message In the text, the TCP sequence number of the end byte is not greater than the third indication value and less than the second indication value, and one or more TCP packets are deleted, and the second indication value indicates that the network device expects to receive the next The TCP sequence number of a TCP packet.

In combination with the third aspect or the first possible implementation of the third aspect, in the second possible implementation, the data part of the TCP message includes a sub-message, and the sub-message is a border gateway protocol BGP packets, or Label Distribution Protocol LDP packets.

With reference to the second possible implementation of the third aspect, in a third possible implementation, the main controller processing the TCP message includes: acquiring routing information of the TCP message, and The above routing information is persisted.

The fourth aspect of the present invention provides a repeater in a communication system, the communication system includes a master controller, a backup controller, the repeater and network equipment, the repeater is located between the master controller and the network Between devices, it is used to receive the message of the main controller and forward it to the network device, or receive the message of the network device and forward it to the main controller, and the forwarder includes: a cache module, After the forwarder receives the message from the main controller or the network device, cache the received message; the processing module is used to monitor the processing status of the cached message, and delete the A message that has been processed in the cached message; a sending module, used to switch the standby controller to the new When the main controller is used, the unprocessed messages in the buffered messages are sent to the new main controller.

With reference to the fourth aspect, in a first possible implementation manner, the forwarder further includes: a receiving module, configured to receive a message sent by the main controller or the network device to indicate that processing has been completed The indication value; the processing module where it is located is specifically configured to delete the processed message in the buffered messages according to the indication value.

With reference to the first possible implementation of the fourth aspect, in the second possible implementation, the message is a transmission control protocol TCP message, and the cache module includes: a confirmation unit, configured to receive The source IP address, destination IP address//source port and destination port in the message header of the received message confirm the corresponding TCP connection; the determining unit is used to determine the address of the message based on the confirmed TCP connection TCP sequence number; a cache unit, configured to cache the received message and the TCP sequence number of the received message.

With reference to the second possible implementation manner of the fourth aspect, in a third possible implementation manner, the cached message includes an inbound message sent by the network device to the main controller, and the forwarding The controller also includes: a receiving module, configured to receive a response message returned by the main controller, wherein the response message includes a first indication value, and the first indication value indicates that the main controller has processed the last input The TCP sequence number of the end byte of the direction message; the processing module is specifically configured to, from the buffered messages, at least one inbound direction message whose TCP sequence number of the end byte is not greater than the first indication value The text is deleted.

With reference to any one of the first to third possible implementation manners of the fourth aspect, in a fourth possible implementation manner, the cached message includes The forwarder further includes: a receiving module, configured to receive a feedback message returned by the network device, the feedback message includes a second indication value, and the second indication value indicates that the network equipment The TCP sequence number of the next outgoing direction message that is expected to be received; the processing module is specifically configured to, from the buffered message, at least one outgoing direction whose TCP sequence number of the end byte is less than the second indication value The message is deleted.

With reference to the fourth possible implementation manner of the fourth aspect, in a fifth possible implementation manner, the sending module is further configured to send a response message to the main controller, and the response message includes the The TCP sequence number of the end byte of the last outgoing message in the buffered message; the receiving module is also used to receive the notification message sent by the main controller, and the notification message includes a third indication value , the third indication value indicates the TCP sequence number of the end byte of the last outgoing message that has been processed by the main controller; the processing module is specifically used to, from the buffered message, end At least one outbound packet whose byte TCP sequence number is less than the second indication value and not greater than the third indication value is deleted.

In combination with the fourth aspect or any one of the first to fifth possible implementations of the fourth aspect, in a sixth possible implementation, the data part of the TCP message includes a sub-message, so The sub-message is a Border Gateway Protocol BGP message or a Label Distribution Protocol LDP message.

With reference to any one of the second to fifth possible implementations of the fourth aspect, in a seventh possible implementation, the cache unit is specifically configured to process the received message according to the TCP The sequence numbers are sorted and cached.

With reference to any one of the first to seventh possible implementation manners of the fourth aspect, in an eighth possible implementation manner, the cache module is further configured to receive the master When the controller or the network device retransmits the message, cache the retransmitted message; the sending module is also used for when the standby controller is switched to a new master controller, if the retransmitted The transmitted message is an unprocessed message, and the forwarder sends the retransmitted message and the original message of the retransmitted message to the new master controller together.

With reference to any one of the fourth to fifth possible implementations of the fourth aspect, in a ninth possible implementation, the transponder further includes: an identification module, configured to Fragmentation flag in the message header of the message, identifying whether the received outgoing message is a fragment of a complete TCP message; the sending module is also used to identify the The received outgoing message is a fragment of a complete TCP message, and after receiving all the fragments of the complete TCP message, start to forward the fragments of the complete TCP message to the network device.

The fifth aspect of the present invention provides a main controller in a communication system, the communication system includes the main controller, a standby controller, a repeater and a network device, and the repeater is located between the main controller and the Between network devices, it is used to receive the message of the main controller and forward it to the network device, or receive the message of the network device and forward it to the main controller, and the main controller includes: receiving A module, configured to receive a message from the network device forwarded by the forwarder; a processing module, configured to process the received message; a sending module, configured to send a message indicating that it has been processed to the forwarder Indicates the completed message.

With reference to the fifth aspect, in a first possible implementation manner, the main controller further includes: a receiving module, configured to receive a response message sent by the forwarder, where the response message includes The TCP sequence number of the end byte of the last TCP message; the processing module is specifically used to process the TCP message according to the response message; the sending module is specifically used to send to the transponder Send a notification message, the notification message includes a third indication value, the third indication value indicates the TCP sequence number of the end byte of the last TCP message that the main controller has processed, and the notification message is received The forwarder is used to delete one or more TCP packets in which the TCP sequence number of the end byte is not greater than the third indication value and less than the second indication value in the cached message, and the second indication The value indicates the TCP sequence number of the next TCP packet that the network device expects to receive.

In combination with the fifth aspect or the first possible implementation of the fifth aspect, in the second possible implementation, the data part of the TCP message includes a sub-message, and the sub-message is a border gateway protocol BGP packets, or Label Distribution Protocol LDP packets.

In combination with the second possible implementation of the fifth aspect, in the third possible implementation, the processing module is specifically configured to remove the header of the TCP message and obtain the data of the TCP message part; recover a complete sub-message from the data part of the TCP message; and perform persistent processing on the sub-message.

The sixth aspect of the present invention provides a main controller in a communication system, the communication system includes a main controller, a standby controller, a repeater and a network device, and the repeater is located between the main controller and the network device In between, it is used to receive the message of the main controller and forward it to the network device, or receive the message of the network device and forward it to the main controller, and the main controller includes: a sending module, Used to send a message to the forwarder, the message is buffered by the forwarder and then sent to the network device; the processing module is used to process the message; the sending module is also used The main controller sends an indication value for indicating that the message has been processed to the forwarder.

With reference to the sixth aspect, in a first possible implementation manner, the main controller further includes: a receiving module, configured to receive a response message sent by the transponder, and the response message includes the The TCP sequence number of the end byte of the last TCP message that has been cached; the processing module is specifically used to process the TCP message according to the response message; the sending module is specifically used to send the The forwarder sends a notification message, the notification message includes a third indication value, the third indication value indicates the TCP sequence number of the end byte of the last TCP message that the main controller has processed, the notification The message is used by the forwarder to delete one or more TCP packets whose TCP sequence number of the end byte is not greater than the third indication value and less than the second indication value in the cached messages, and the first The two indication values indicate the TCP sequence number of the next TCP message that the network device expects to receive.

In combination with the sixth aspect or the first possible implementation of the sixth aspect, in the second possible implementation of the sixth aspect, the data part of the TCP message includes a sub-message, and the sub-message It is a Border Gateway Protocol BGP packet or a Label Distribution Protocol LDP packet.

In combination with the second possible implementation of the sixth aspect, in a third possible implementation, the processing module is specifically configured to obtain routing information of the TCP message, and perform persistent processing on the routing information .

A seventh aspect of the present invention provides a communication system, the communication system includes a master controller, a standby controller, a repeater, and a network device, wherein the repeater is located between the master controller and the network device, It is used to receive the message of the main controller and forward it to the network device, or receive the message of the network device and forward it to the main controller; and, after receiving the message from the main controller or the After the message of the network device, cache the received message, monitor the processing status of the cached message, and delete the processed message in the cached message; when the standby controller switches to the new When the master controller is used, the forwarder sends the unprocessed messages in the buffered messages to the new master controller; the master controller is used to send messages to the forwarder, for Processing the sent message, or receiving a message from the network device forwarded by the forwarder, and processing the received message; and sending a message indicating that the process has been completed to the forwarder The indication value of the message; the network device is used to send a message to the forwarder, or receive the message from the master controller forwarded by the forwarder; the standby controller is used to When the master controller fails, switch to a new master controller.

It can be seen from the above that in some feasible embodiments of the present invention, the forwarder caches the received message and deletes the cached message after confirming that the cached message has been processed. If the active and standby controllers perform identity switching, Then upload the cached and unprocessed messages to the technical solution of the new master controller, The following technical effects have been achieved: by using the forwarder to cache messages for data backup, data backup between the active and standby controllers is avoided, the burden on the active and standby controllers can be reduced, the system load can be reduced, and the system efficiency and reliability can be effectively improved.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that are required in the description of the embodiments and prior art. Obviously, the accompanying drawings in the following description are only some implementations of the present invention For example, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1a is a schematic diagram of the network structure of SDN in the embodiment of the present invention;

Figure 1b is a schematic structural diagram of an IP packet;

Fig. 1c is a structural schematic diagram of an IP header;

Figure 1d is a schematic structural diagram of a TCP header;

Fig. 1e is a schematic diagram of identity switching between active and standby controllers;

Fig. 1f is a schematic diagram of TCP packet fragmentation;

Fig. 1g is a schematic diagram of TCP packet retransmission;

FIG. 2 is a flowchart of a communication method in a communication system provided by Embodiment 1 of the present invention;

FIG. 3a is a flowchart of a communication method in a communication system provided by Embodiment 2 of the present invention;

Fig. 3b is a schematic diagram of a specific application scenario of the present invention;

FIG. 4a is a flowchart of a communication method in a communication system provided by Embodiment 3 of the present invention;

Fig. 4b is a schematic diagram of another specific application scenario of the present invention;

Fig. 4c is a schematic diagram of another specific application scenario of the embodiment of the present invention;

FIG. 5 is a flowchart of a communication method in a communication system provided by Embodiment 4 of the present invention;

FIG. 6 is a flowchart of a communication method in a communication system provided by Embodiment 5 of the present invention;

Fig. 7a is a schematic diagram of a transponder in a communication system provided by Embodiment 6 of the present invention;

Fig. 7b is a schematic diagram of a transponder in another communication system provided by Embodiment 6 of the present invention;

FIG. 8 is a schematic diagram of a main controller in a communication system provided by Embodiment 7 of the present invention;

Fig. 9a is a schematic diagram of a main controller in a communication system provided by Embodiment 8 of the present invention;

Fig. 9b is a schematic diagram of a main controller in another communication system provided by Embodiment 8 of the present invention;

FIG. 10 is a schematic diagram of a transponder in a communication system according to an embodiment of the present invention;

Fig. 11 is a schematic diagram of a main controller in a communication system provided by an embodiment of the present invention;

Fig. 12 is a schematic diagram of a main controller in a communication system provided by an embodiment of the present invention.

detailed description

Embodiments of the present invention provide a communication method, device, and system in a communication system to solve the problem that a large amount of TCP information needs to be synchronized in real time between the active and standby controllers in the existing SDN, resulting in a heavy burden on the active and standby controllers and affecting system performance. technical problem. The embodiment of the present invention also provides a corresponding transponder.

In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

In the following, specific examples will be used to describe in detail respectively.

Embodiment one

Please refer to FIG. 1a, which is a schematic diagram of a network structure of a communication system involved in an embodiment of the present invention.

Specifically, the communication system may be a software-defined network (SDN), and the SDN includes a controller, a repeater, and a network device. Wherein, there are two or more controllers, specifically including one master controller and at least one standby controller. The controller may be a hardware device, or a virtual machine, for example, specifically, a physical server or a virtual machine running in the physical server. The forwarder can be a forwarding device such as a physical or virtual switch or router. The controller and the forwarder use the OpenFlow protocol to interact. The forwarder performs data forwarding according to the instruction of the controller, and is used to forward the message of the main controller to the network device, or forward the message of the network device to the main controller. The packets sent by the controller or the packets sent by the network equipment all pass through the transponder.

The communication system mentioned is not limited to the telecommunication communication system, and may also be a communication system in other fields, such as a communication system composed of IT (Information Technology, information technology) equipment.

Wherein, the primary controller completes business processing, and the standby controller acts as a backup. The transponder only interacts with the main controller and accepts the command and control of the main controller. When the master controller fails, the standby controller replaces the master controller in real time The controller acts as a new master controller to perform business processing; during the whole process, the peer device (such as the network device in Figure 1a) that communicates with the master controller does not perceive it.

In this paper, the message exchanged between the main controller and the network device can be any protocol message based on the TCP connection, for example, it can be a BGP (Border Gateway Protocol, Border Gateway Protocol) message, or an LDP (Label Distribution Protocol, label distribution protocol) messages, etc. Generally, IP (Internet Protocol, a protocol for interconnection between networks) packets are used to carry TCP packets, and TCP packets are used to carry BGP packets or LDP packets. The outer-encapsulated message header of the BGP message or LDP message exchanged between the main controller and the network device includes a TCP header and an IP header.

As shown in FIG. 1b, the BGP message or the LDP message is carried in the data field of the TCP message, and the TCP message is carried in the data field of the IP message.

As shown in FIG. 1c, it is a structural schematic diagram of the IP header of the IP message. The IP header includes the source IP address of the IP packet (that is, the 32-bit source IP address in FIG. 1c ) and the destination IP address (that is, the 32-bit destination IP address in FIG. 1c ).

As shown in FIG. 1d, it is a schematic structural diagram of a TCP header of a TCP message. The TCP header includes the source port of the TCP message (i.e. the 16-bit source port in Figure 1d) and the destination port (i.e. the 16-bit destination port in Figure 1d), and also includes the TCP serial number of the TCP message (i.e. the 16-bit source port in Figure 1d). 32-bit serial number).

Each byte of the data field of the TCP message corresponds to a TCP sequence number. Generally, the TCP sequence number of the start byte of the data field of the TCP message is carried in the TCP header (32-bit sequence number) as The TCP sequence number of the TCP packet. For example, if the TCP sequence number of a TCP message is 100, it means that the TCP sequence number of the start byte of the data field of the TCP message is 100, and the TCP sequence number of each byte after the start byte The order is 101, 102, 103....

The length value of the TCP message is generally carried in the IP header (that is, the 16-bit total length in Figure 2b). According to the TCP sequence number of the TCP message and the length of the TCP message, the end of the data field of the TCP message can be calculated The TCP sequence number of the byte (referred to as the end byte of the TCP packet). For example, if the TCP serial number of a TCP message is 100, and the length of the TCP message is 50 (indicating that the data field of the TCP message includes 50 bytes), then the TCP sequence number of the end byte of the TCP message The serial number is 100+50-1=149.

For the convenience of identification, in this paper, the TCP sequence number of the TCP message can be called the starting TCP sequence number of the TCP message; the TCP sequence number of the end byte of the TCP message can be called the ending TCP sequence number.

Referring to FIG. 2 , an embodiment of the present invention provides a communication method in a communication system.

Wherein, the communication system includes a main controller, a standby controller, a repeater, and a network device, and the repeater is located between the main controller and the network device, and is used to receive the message of the main controller and forward it to the network device, or receive the message from the network device and forward it to the main controller.

The core idea of the technical solution of the embodiment of the present invention is that the forwarder replaces the standby controller to listen to the messages sent by the master controller or the network equipment in real time, and cache the intercepted messages until they are confirmed. After the cached packets are processed, the cached packets are deleted. In this way, the unprocessed packets will be buffered in the forwarder. When the master controller fails and the identity of the master controller and the standby controller are switched, the forwarder will upload all the buffered messages that have not been processed to the new master controller, so that the business will not be interrupted when the master controller is switched. , the data is not lost.

As shown in Figure 2, the method of the embodiment of the present invention may include:

201. After receiving a packet from the main controller or the network device, the forwarder buffers the received packet.

In the embodiment of the present invention, among the messages received from the main controller or the network device, the forwarder first buffers the received messages, and only forwards the messages that have been buffered. The cache may be stored in a local storage device of the transponder, or may be stored in other third-party storage devices. Moreover, after forwarding, the forwarded message will not be deleted.

In this document, the message mentioned can be any protocol message based on the TCP connection, referred to as TCP message. The buffering of the received message may include: confirming the corresponding TCP connection according to the source IP address, destination IP address, source port and destination port in the message header of the received message; based on the confirmation determine the TCP sequence number of the received message, and cache the received message and the TCP sequence number of the message. The message is a TCP message, and the TCP sequence number of the message refers to the TCP sequence number of the initial byte of the data field of the TCP message (which may be referred to as the initial TCP sequence number of the message). In communication based on a TCP connection, a set of source IP address, destination IP address, source port, and destination port uniquely correspond to a TCP connection.

When there are multiple TCP connections, in order to uniquely identify the received message, the forwarder needs to confirm the TCP connection corresponding to the received message, and further confirm the TCP sequence number of the message, and use the corresponding TCP connection The two parameters of connection and TCP sequence number are used to mark the received message.

Optionally, the forwarder can set multiple storage units in the storage device, the multiple storage units correspond to multiple TCP connections respectively, and buffer the received messages in different storage units according to the TCP connections to which they belong, so as to It is convenient for follow-up processing.

There are two ways to cache the message and the TCP sequence number of the message. One is to only cache the message. Since the message contains the TCP sequence number of the message, the cache message means At the same time, the TCP sequence number of the message is cached; the other is that when the message is cached, the TCP sequence number of the message is extracted from the message, and it corresponds to the TCP sequence number of the cached message.

202. The forwarder monitors the processing status of the cached packets, and deletes the processed packets in the cached packets.

In this embodiment, the forwarder monitors the processing status of all messages cached in the cache device, and judges whether each cached message has been processed. Said processing refers to being processed by the main controller and/or the network device, wherein, for the inbound message sent by the network device to the main controller, it is only necessary to monitor whether the main controller has finished processing; for The main controller sends the outbound packets of the network equipment, and can only monitor whether the network equipment has been processed, or can monitor whether the main controller and the network equipment have both been processed.

Optionally, the main controller or the network device may send an indication value for indicating the message that has been processed to the forwarder, and the indication value may include the message that the main controller or the network device has processed The number of the message, the number of each message at the main controller and the network device is the same, so as to inform the forwarder which messages have been processed, and the forwarder receives the data from the main controller or the network device The indication value sent to indicate the message that has been processed is used to confirm which messages have been processed, and the message that has been processed in the buffered messages is deleted according to the indication value. Among the cached messages, the processed messages are deleted; the unprocessed messages are not deleted. The number in the indication value may be the TCP sequence number of the message, or other numbers may be used, for example, to generate a new number to mark the message.

203. When the standby controller is switched to be a new master controller, the forwarder sends unprocessed packets among the cached messages to the new master controller.

In this embodiment, when the master controller fails and the standby controller is switched to be a new master controller, The forwarder can learn that the identity switch of the active and standby controllers has been performed by interacting with the active or standby controllers. At this time, due to the failure of the original master controller, the unprocessed messages cached in the forwarder will not be processed by the original master controller, so the forwarder can save the buffered messages that have not been processed The message is sent to the new master controller for processing by the new master controller. Therefore, when the active and standby controllers are switched, it can ensure that services are not interrupted and data is not lost.

It can be seen from the above that the embodiment of the present invention provides a communication method in a communication system, which achieves the following technical effects: the forwarder caches the message, realizes the controller hot standby communication based on the TCP connection, and avoids the communication between the active and standby controllers. Data backup between active and standby controllers can reduce the burden on the active and standby controllers, reduce system load, and effectively improve system efficiency and reliability; at the same time, different forwarders can be used to cache their respective TCP information, which can realize system load sharing to multiple devices , which can prevent the main controller from becoming a performance bottleneck.

In the following, the method of the embodiment of the present invention will be further described respectively from the outgoing direction (direction from the main controller to the network device) and the incoming direction (direction from the network device to the main controller).

Embodiment two

Please refer to FIG. 3a. An embodiment of the present invention provides a communication method in a communication system. The method is used in the SDN shown in FIG. Methods can include:

301. The forwarder receives and buffers an inbound packet sent by a network device to the forwarder; and forwards the inbound packet to the main controller.

In the embodiment of the present invention, based on the TCP connection, the forwarder monitors and caches the inbound message sent by the network device to the main controller (or to the forwarder). Since the forwarder is responsible for forwarding the messages exchanged between the main controller and the network device, the inbound messages sent by the network device to the main controller will pass through the forwarder, and the forwarder can cache each passing inbound message.

Specifically, the transponder can receive in real time a network device, such as a router, from an inbound packet sent to the main controller through a TCP connection; according to the source IP address, destination IP address, and source port in the header of the inbound packet 1. The destination port, confirming the corresponding TCP connection; based on the confirmed TCP connection, determining the TCP sequence number of the message, and caching the incoming message and the TCP sequence number of the incoming message.

Among them, the source IP address of the inbound packet is the IP address of the network device, and the destination IP address is the forwarder IP address. Specifically, the source IP address of the incoming message is, for example, the BGP neighbor address of the network device, and the destination IP address is, for example, the local IP address of the BGP neighbor established between the main controller and the network device, and the local IP address is the IP address on the forwarder . A set of source IP address, destination IP address, source port, and destination port can determine a pair of BGP neighbors (including the main controller and a network device), and a pair of BGP neighbors corresponds to a TCP connection.

Optionally, when caching the inbound packets, the inbound packets may be stored in different storage units according to different TCP connections to which the packets belong. The incoming packets of each TCP connection are stored in an independent storage unit, and correspondingly store the TCP sequence numbers of the incoming packets of the TCP connection. Preferably, the cached inbound packets are sorted according to the TCP sequence numbers, so as to facilitate subsequent sequential processing.

It can be seen from the above that in this embodiment, the forwarder first caches the received inbound packets, and the cached inbound packets are sent to the main controller for processing.

302. The forwarder monitors the processing status of the cached inbound packets, and deletes at least one inbound packet in the cached inbound packets that has been processed.

After the incoming packets arrive at the main controller through the forwarder, the main controller processes the incoming packets. When the forwarder confirms that the inbound packet has been processed, it deletes the cached packet. In one embodiment, after the main controller finishes processing the incoming message, it will send a response message to the forwarder, and the response message includes a first indication value, and the first indication value indicates that the main controller has The TCP serial number of the end byte of the last incoming direction message that has been processed; At least one inbound packet (that is, a packet that has been processed) of the first indication value is deleted. In other implementation manners, the forwarder may also confirm that the inbound message has been processed in other ways, for example, after forwarding the inbound message to the main controller for a certain period of time, it considers that the inbound message has been processed; Confirmation methods are not limited.

In a specific implementation, a protocol stack SOCK module and a specific protocol processing module, such as a BGP processing module or an LDP processing module, are generally deployed in the main controller. This document takes the BGP processing module as an example.

The inbound message received by the main controller first arrives at the SOCK module, and the SOCK module removes the message header (including the IP header and the TCP header) of the inbound message to obtain the carried message such as a BGP message, and then converts the BGP The message and the TCP sequence number of the BGP message are passed to the BGP processing module. The TCP sequence number can be to obtain from the TCP header.

The BGP processing module processes the incoming packets, and returns a response message to the forwarder after processing. The processing may be, for example, persistent processing, that is, storing the received inbound message in a database; the processing may also be, for example, other processing methods. The response message may include a first indication value, where the first indication value indicates the TCP sequence number of the end byte of the last incoming message that has been processed by the master controller. The TCP sequence number of the end byte of the message can be obtained by adding the TCP sequence number of the message to the message length and then subtracting 1. Specifically, the first indication value may be the TCP sequence number of the end byte of the last inbound packet that has been processed by the main controller, or the first indication value may also include the last inbound packet that has been processed by the main controller. The TCP sequence number of the direction packet and its packet length.

The forwarder receives the response message returned by the main controller, and obtains the first indication value contained in the response message; then, according to the first indication value, finds out at least one inbound direction message that has been processed from all cached inbound direction messages The message is deleted.

303. When the standby controller is switched to be a new master controller, the forwarder sends unprocessed packets among the cached messages to the new master controller.

The active and standby controllers can interact with the forwarder through the OpenFlow protocol, and the forwarder can perceive the status and role of the controller in real time, that is, it can perceive whether the identity of the active and standby controllers has been switched, and which controller is currently the active controller .

As shown in Figure 1e, when the master controller fails, the forwarder detects that the master controller and a standby controller have switched identities, and when a standby controller switches to the new master controller, the forwarder and the new master controller The device performs data smoothing. The data smoothing specifically includes: the forwarder uploads all cached inbound messages that have not been processed to the new main controller, and the new main controller processes them. Since unprocessed packets are retransmitted to the new primary controller, the primary controller can resume services based on this, and when the primary and secondary controllers are switched, the service of incoming packets will not be interrupted and data will not be lost.

It should be noted that, in the embodiment of the present invention, an agent (AGENT) module can be deployed in the forwarder, taking BGP packets as an example, a BGP AGENT module can be deployed. The process of the above method can be specifically implemented by the proxy module deployed in the repeater. The agent module can only interact with the main controller.

Please refer to FIG. 3b , which is a schematic diagram of a specific application scenario of an embodiment of the present invention. As shown in Figure 3b, The processing flow for incoming packets may include:

(1) After receiving and buffering packets TCP1 and TCP2, the BGP AGENT module in the forwarder sends TCP1 and TCP2 to the SOCK module in the master controller. Among them, the TCP sequence number of TCP1 is 100, and the packet length is 50; the TCP sequence number of TCP2 is 150, and the packet length is 50.

(2) In the main controller, the SOCK module reports to the BGP processing module the TCP1 and TCP2 whose message headers have been removed, and the respective TCP sequence numbers of TCP1 and TCP2. Wherein, TCP1 and TCP2 may be, for example, BGP packets after removing packet headers.

(3) In the master controller, the BGP processing module reports the complete BGP message carried in TCP1 and TCP2 such as an update (update) message to the BGP processing module, and the TCP sequence number of the end byte of the update message is one And report to BRM (BGP Route Management, BGP routing management) module. Among them, assuming that the length of the update message is 75, carried by TCP1 and TCP2, the TCP sequence number of the update message is 100, and the TCP sequence number of the end byte is 175, that is, the first 50 bytes of the update message are carried in In TCP1, the last 25 bytes are carried in TCP2.

(4) The BRM module performs persistent processing on the update message. After the processing is completed, it notifies the BGP processing module that the processing has been completed. Specifically, it can notify the TCP sequence number 175 to the BGP processing module.

(5) The BGP processing module returns the response message carrying the TCP sequence number 175 to the BGP AGENT module. The BGP-AGENT module deletes the complete inbound packets whose TCP sequence number of the end byte is not greater than the specific sequence number 175, so: only TCP1 is deleted, and TCP2 is reserved.

Optionally, in the embodiment of the present invention, the proxy module deployed in the forwarder can sense the TCP sequence number and protocol message boundary, and support corresponding processing on TCP retransmission, out-of-sequence, and fragmentation. TCP packets may be retransmitted, and the receiving end needs to use the TCP sequence number to distinguish which are retransmitted packets; TCP packets follow different network paths, and the order of packet arrival may be different from that of the sending end; TCP packets are too large, and may It is divided into multiple pieces of packets on the network path, and the fragmented packets need to be reassembled at the receiving end. In the embodiment of the present invention, several special cases for incoming packets can be handled in the following manner:

1. Out-of-order TCP messages: out-of-order TCP messages may occur during transmission, and the BGP AGENT module can sort the cached TCP messages according to the TCP sequence number to facilitate subsequent deletion of cached messages; that is, the forwarding The device can sort the received packets according to the TCP sequence numbers and then cache them.

2. TCP Fragmentation: In the transmission of a TCP message, according to the link MTU (Maximum Transmission Unit (Maximum Transmission Unit) has different sizes and may be fragmented. The BGP AGENT module can identify TCP packets that are divided into multiple fragments according to the fragmentation flag in the IP header, and delete a TCP packet uniformly. Wherein, the fragment flag bit may specifically be a 13-bit slice offset in the IP header in FIG. 2 b , and different fragments are represented by different fragment flag bits. As shown in Figure 1f, it is a schematic diagram of TCP fragmentation.

In other words, the forwarder can identify whether the received inbound message is a fragment of a complete TCP message according to the fragmentation flag in the message header of the inbound message; if so, The forwarder deletes at least one inbound packet whose TCP sequence number of the end byte is not greater than the first indication value from the buffered packets, including: at the end byte of the complete TCP packet When the TCP sequence number is not greater than the first indication value, all fragments of the complete TCP message are deleted together.

3. TCP retransmission: The main controller or network device may retransmit the TCP message and reassemble the message. As shown in Figure 1g, at this time, the BGP-AGENT module can save the messages before and after retransmission, and when the forwarder receives the message retransmitted by the main controller or the network device, it can cache the retransmitted message message; when the standby controller is switched to a new master controller, if the retransmitted message is an unprocessed message, the forwarder will send the retransmitted message and the retransmitted The original message of the message is sent to the new main controller together.

Embodiment three

Please refer to FIG. 4a. The embodiment of the present invention provides another communication method in a communication system. This method is used in the SDN shown in FIG. , the method can include:

401. The forwarder receives and buffers an outbound packet sent by the main controller to the forwarder; and forwards the outbound packet to a network device.

In the embodiment of the present invention, based on the TCP connection, the forwarder intercepts and caches the outgoing message sent by the main controller to the network device (or to the forwarder). Since the forwarder is responsible for forwarding the messages exchanged between the master controller and the network device, the outbound messages sent by the master controller to the network device will pass through the forwarder, and the forwarder can cache each passing outbound message.

Specifically, the transponder receives in real time the outbound message sent by the main controller to the network device such as a router through the TCP connection; according to the source IP address in the message header of the outbound message, the destination IP address, and the source port, The purpose port is to confirm the corresponding TCP connection; based on the confirmed TCP connection, determine the The TCP sequence number of the message, cache the outgoing direction message and the TCP sequence number of the outgoing direction message; in addition, it can return the TCP sequence number containing the end byte of the last outgoing message that has been cached Response message to the master controller.

Wherein, the destination IP address of the outgoing message is the IP address of the network device, and the source IP address is the IP address of the forwarder. Specifically, the destination IP address of the outgoing message is, for example, the BGP neighbor address of the network device, and the source IP address is, for example, the local IP address of the BGP neighbor established between the main controller and the network device, and the local IP address is the IP address on the forwarder . A set of source IP address, destination IP address, source port, and destination port can determine a pair of BGP neighbors (including the main controller and a network device), and a pair of BGP neighbors corresponds to a TCP connection.

Among them, the BGP processing module in the main controller specifies the TCP sequence number for the outgoing message, and sends the TCP sequence number and the outgoing message to the SOCK module; TCP is based on flow, such as the TCP sequence number specified by the BGP processing module is 100, send a BGP message with a length of 100, the TCP sequence number of the BGP message is 100, and the TCP sequence number of the end byte of the BGP message is 100+100-1=199. The SOCK module encapsulates the BGP message including the TCP/IP header and sends it to the forwarder.

In this embodiment, the forwarder first caches the received outbound packets, and then forwards the cached outbound packets to the network device. At the same time, record the TCP sequence number of the end byte of the cached outgoing message, and send a response message carrying the sequence number to notify the BGP processing module that the outgoing message has been received.

Specifically, the processing flow of outgoing packets between the main controller and the forwarder may include:

1. The main controller sends the outgoing message to the transponder in a transparent way;

2. The transponder sends a response message to the main controller for receiving the outgoing message; the response message carries the TCP sequence number of the end byte of the outgoing message;

3. The main controller processes the outbound packets;

The processing may include: obtaining the routing information of the corresponding outbound packet according to the received response message, and persisting the routing information of the packet, such as storing it in a database. In other words, the main controller knows the routing information that has been received by the forwarder according to the received response message, and marks the routing information that has been received and cached by the forwarder (meaning that if a switching occurs, this message) will be marked with "already processing" mark, record in the database (the standby controller restores the service based on the data in this database), and consider it marked as "processed" The routing information marked with "Management" does not need to be resent to the neighbors after the switchover occurs.

4. The main controller sends a processing completed notification message to the transponder; the notification message carries the TCP sequence number of the end byte of the processed outgoing message.

402. The forwarder monitors the processing status of the cached outbound packets, and deletes at least one outbound packet that has been processed in the cached outbound packets.

In some embodiments, the processing flow of the outbound packet between the network device and the forwarder may include:

1. The transponder sends the outbound packet to the network device;

2. After receiving the outbound packet, the network device sends a feedback message to the transponder. Optionally, the feedback message may specifically be a TCP ACK (Acknowledgment, confirmation character).

Above, the transponder receives the feedback message returned by the network device, the feedback message includes a second indication value, and the second indication value indicates the TCP sequence number of the next outbound message that the network device expects to receive; the transponder At least one outbound packet whose end byte TCP sequence number is smaller than the second indication value (that is, the outbound packet that has been processed) may be deleted from the buffered packets. Specifically, the second indication value may be the TCP sequence number of the next outgoing message that the network device expects to receive, or the second indication value may also include the TCP sequence number of the last outgoing message received by the network device number and its message length.

Optionally, the forwarder may also receive a notification message sent by the master controller, where the notification message includes a third indication value, and the third indication value indicates the last outgoing message that has been processed by the master controller The TCP sequence number of the end byte; the transponder may, from the buffered message, at least one outbound direction whose TCP sequence number of the end byte is less than the second indication value and not greater than the third indication value The message (that is, the outbound message that has been processed) is deleted. Specifically, the third indication value may be the TCP sequence number of the end byte of the last outgoing message that has been processed by the main controller, or the third indication value may also include the TCP sequence number and packet length of the last outbound packet processed.

In other implementation manners, the forwarder may also confirm that the outgoing message has been processed in other ways. For example, after the forwarder forwards the outgoing message to the network device for a certain period of time, it considers that the outgoing message has been processed; in this paper, There is no restriction on the confirmation method.

It should be noted that the feedback message is sent by the network device after receiving the outgoing message, and the The notification message is sent by the master controller after performing persistent processing (for example, storing in a database) the routing information corresponding to the outgoing message.

403. When the standby controller is switched to be a new master controller, the forwarder sends unprocessed packets among the cached messages to the new master controller.

The active and standby controllers interact with the forwarder through the OpenFlow protocol. The forwarder can perceive the status and role of the controller in real time, that is, it can perceive whether the identity of the active and standby controllers has been switched, and which controller is currently the active controller.

As shown in Figure 1e, when the primary controller fails, the forwarder detects that the identity of the primary controller and the standby controller has been switched, and when a standby controller is switched to be the new primary controller, the forwarder and the new primary controller Perform data smoothing. The data smoothing specifically includes: the forwarder uploads all cached outbound messages that have not been processed to the new master controller, and the new master controller processes them. Since unprocessed packets are retransmitted to the new primary controller, the primary controller can restore services based on this, so that when the primary and secondary controllers are switched, the service of outgoing packets will not be interrupted and data will not be lost.

It should be noted that, in the embodiment of the present invention, an agent (AGENT) module can be deployed in the forwarder, taking BGP packets as an example, a BGP AGENT module can be deployed. The process of the above method can be specifically implemented by the proxy module deployed in the repeater. The agent module can only interact with the main controller. Optionally, the proxy module used for the outbound direction in this embodiment and the proxy module used for the inbound direction in the embodiment of FIG. 3a may be the same proxy module, or may be different proxy modules.

Please refer to FIG. 4b, which is a schematic diagram of a specific application scenario according to an embodiment of the present invention. As shown in Figure 4b, the processing flow for outgoing packets may include:

(1) The protocol processing module in the main controller, such as the BGP processing module, sends a BGP message with a message length of 200 and a TCP sequence number of 200 to the SOCK module. It is easy to know that the TCP sequence number of the start byte of the data field of the BGP message is 200, and the TCP sequence number of the end byte is 399.

(2) The SOCK module encapsulates the header of the BGP message, that is, the TCP header and the IP header, and the message after the header is represented by TCP1, and then sends TCP1 to the BGP AGENT module of the forwarder.

(3) The BGP AGENT module caches TCP1, and then sends TCP1 to the network device.

(3') After the BGP AGENT module receives TCP1, it also returns the response message of the TCP serial number (that is, 399) that includes the end byte of TCP1 to the master controller;

(4) The BGP processing module in the main controller stores the routing information corresponding to TCP1 into the database, and after realizing data persistence, sends a notification message that the processing is completed to the transponder; the notification message carries the third indication value, that is, processed The TCP sequence number of the end byte of the completed TCP1 is 399, for example.

(5) After the BGP AGENT module sends TCP1 to the network device, it will receive the feedback message returned by the network device, which contains the second indication value, that is, the TCP sequence of the next outgoing message to be processed by the network device number, such as 401.

(6) After the BGP AGENT module receives the notification message and the response message, it deletes the outgoing direction message whose TCP sequence number of the end byte is not greater than 399.

It is worth noting that the BGP AGENT module needs to sense the boundaries of BGP packets and send them out after receiving complete BGP packets. Otherwise, if the BGP AGENT module only receives half of the BGP packets and the second half of the BGP packets is If the identity switchover of the standby controller is not received, half of the unreceived BGP packets cannot be recovered, and the neighbor session will be interrupted. For example, in the application scenario shown in Figure 4c, the process includes:

(1) The BGP processing module sends BGP messages with lengths of 600 and 300 to the SOCK module, and the initial TCP sequence numbers of the two BGP messages before and after are respectively 200 and 800;

(2) The SOCK module encapsulates two BGP messages into three TCP messages, namely, TCP1, TCP2, and TCP3, wherein the length of TCP1 and the TCP serial number are 400 and 200 respectively, and the length of TCP2 and the TCP serial number are respectively are 400 and 600, and the TCP3 length and TCP sequence number are 100 and 1000, respectively.

(3) The SOCK module sends TCP1 to the BGP AGENT module, and the BGP AGENT module checks TCP1 and finds that the BGP message is incomplete, then caches it locally but does not send it to a network device such as an LDM (Local Distribute Management, local distribution management) device.

(4) The SOCK module continues to send TCP2 to the BGP AGENT module.

(5) The BGP AGENT module receives and checks TCP1 and TCP2, and finds that the BGP message with a length of 600 is complete, then begins to send TCP1 to the network device; and, after buffering TCP2, sends TCP2 to the network device.

In some embodiments of the present invention, the proxy module deployed in the forwarder can sense the TCP sequence number and protocol message boundaries, and support corresponding processing of TCP retransmission, out-of-sequence, and fragmentation. TCP packets may be retransmitted, and the receiving end needs to use the serial number to distinguish which are retransmitted packets; TCP packets follow different network paths, and the arrival order of the packets may be different from that of the sending end; network road The packet is divided into multiple fragments along the path, and the fragmented packets need to be reassembled at the receiving end. For the handling of special cases such as retransmission, out-of-sequence, and fragmentation of outbound packets, refer to the previous section for processing inbound packets. Wherein, the processing of fragmentation is slightly different from the processing of incoming packets, the difference is that the transponder can identify the whether the received outgoing message is a fragment of a complete TCP message; if so, the forwarder starts to forward the complete TCP message to the network device after receiving all the fragments of the complete TCP message; Fragmentation of the TCP message; if all the fragments of the complete TCP message have not been received, it will only be cached and not forwarded. For retransmission and out-of-sequence processing, the processing of outbound and inbound packets can be the same.

Embodiment four

Please refer to FIG. 5 , an embodiment of the present invention also provides a communication method in a communication system, the communication system includes a master controller, a backup controller, a repeater and a network device, and the repeater is located between the master controller and Between the network devices, it is used to receive the message of the main controller and forward it to the network device, or receive the message of the network device and forward it to the main controller, and the method includes:

501. The main controller receives the packet forwarded by the forwarder from the network device, and processes the received packet;

502. The main controller sends, to the repeater, an indication value of the main controller used to indicate that a packet has been processed.

In some specific implementations, the message is a transmission control protocol TCP message, and the main controller may send a response message to the forwarder, and the response message includes a first indication value, and the first indication value indicates The TCP sequence number of the end byte of the last TCP message that the main controller has processed, and the response message is used by the forwarder to save the TCP sequence number of the end byte in the TCP message cached by itself At least one TCP packet not greater than the first indication value is deleted.

Optionally, the data part of the TCP message includes a sub-message, and the sub-message is a Border Gateway Protocol (BGP) message or a Label Distribution Protocol (LDP) message.

In some embodiments of the present invention, the processing of the received TCP message by the main controller includes:

removing the header of the TCP message to obtain the data part of the TCP message;

Recovering a complete sub-message from the data part of the TCP message;

Perform persistent processing on the sub-message.

It can be seen from the above that the embodiment of the present invention provides a communication method in a communication system, which achieves the following technical effects: the forwarder caches the message, realizes the controller hot standby communication based on the TCP connection, and avoids the communication between the active and standby controllers. Data backup between active and standby controllers can reduce the burden on the active and standby controllers, reduce system load, and effectively improve system efficiency and reliability; at the same time, different forwarders can be used to cache their respective TCP information, which can realize system load sharing to multiple devices , which can prevent the main controller from becoming a performance bottleneck.

Embodiment five

Please refer to FIG. 6, an embodiment of the present invention also provides a communication method in a communication system, the communication system includes a main controller, a backup controller, a repeater and a network device, and the repeater is located between the main controller and Between the network devices, it is used to receive the message of the main controller and forward it to the network device, or receive the message of the network device and forward it to the main controller, and the method includes:

601. After the main controller generates a Transmission Control Protocol TCP message, it sends the message to the forwarder, and the sent message is cached by the forwarder and then sent to the network device.

602. The master controller processes the sent message.

Optionally, the master control may receive a response message sent by the forwarder, and the response message includes the TCP sequence number of the end byte of the last TCP message that the forwarder has cached; according to the response The message processes the TCP packet.

603. The main controller sends, to the forwarder, an indication value of the main controller used to indicate that the packets have been processed.

In some specific implementations, the main controller may send a notification message to the repeater, and the notification message includes a third indication value, and the third indication value indicates the last TCP that the main controller has processed. The TCP sequence number of the end byte of the message, the notification message is used by the forwarder to set the TCP sequence number of the end byte in the buffered message not greater than the third indication value and less than the second indication value One or more TCP packets with values are deleted, and the second indication value indicates the TCP sequence number of the next TCP packet that the network device expects to receive.

Optionally, the data part of the TCP message includes a sub-message, and the sub-message is a Border Gateway Protocol (BGP) message or a Label Distribution Protocol (LDP) message.

In some embodiments of the present invention, the processing of the TCP message by the main controller includes:

Obtain the routing information of the TCP message, and perform persistent processing on the routing information.

It can be seen from the above that the embodiment of the present invention provides a communication method in a communication system, which achieves the following technical effects: the forwarder caches the message, realizes the controller hot standby communication based on the TCP connection, and avoids the communication between the active and standby controllers. Data backup between active and standby controllers can reduce the burden on the active and standby controllers, reduce system load, and effectively improve system efficiency and reliability; at the same time, different forwarders can be used to cache their respective TCP information, which can realize system load sharing to multiple devices , which can prevent the main controller from becoming a performance bottleneck.

In order to better implement the above solutions of the embodiments of the present invention, related devices for coordinating the implementation of the above solutions are also provided below.

Embodiment six

Please refer to Fig. 7a, an embodiment of the present invention provides a repeater 700 in a communication system, the communication system includes a main controller, a backup controller, the repeater and network equipment, the repeater is located in the main control Between the router and the network device, it is used to receive the message of the main controller and forward it to the network device, or receive the message of the network device and forward it to the main controller, and the forwarder May include:

A cache module 701, configured to cache the received message after the forwarder receives the message from the main controller or the network device;

A processing module 702, configured to monitor the processing status of the cached messages, and delete the processed messages in the cached messages;

The sending module 703 is configured to send unprocessed messages among the cached messages to the new master controller when the standby controller is switched to the new master controller.

Please refer to FIG. 7b. In some embodiments of the present invention, the transponder 700 further includes:

The receiving module 704 is configured to receive an indication value sent by the main controller or the network device to indicate that the message has been processed; the processing module 702 can be specifically configured to delete the message according to the indication value Packets that have been processed in the buffered packets.

In some embodiments of the present invention, the caching module 701 may specifically include:

A confirmation unit, configured to confirm the corresponding TCP connection according to the source IP address, destination IP address, source port and destination port in the message header of the received message;

A determining unit, configured to determine the TCP sequence number of the message based on the confirmed TCP connection;

A cache unit, configured to cache the received message and the TCP sequence number of the received message.

In some embodiments of the present invention, the cached message includes an inbound message sent by the network device to the forwarder, please refer to FIG. 7b, the forwarder 700 may further include: a receiving module 704;

The receiving module 704 is configured to receive a response message returned by the main controller, the response message includes a first indication value, and the first indication value indicates the last incoming packet that has been processed by the main controller The TCP sequence number of the end byte;

The processing module 702 is specifically configured to delete at least one inbound packet whose end byte TCP sequence number is not greater than the first indication value from the buffered packets.

In some embodiments of the present invention, the cached message includes an outbound message sent by the main controller to the forwarder, please refer to FIG. 7b, the forwarder 700 may also include: a receiving module 704; The receiving module 704 is configured to receive a feedback message returned by the network device, the feedback message includes a second indication value, and the second indication value indicates the TCP address of the next outgoing message that the network equipment expects to receive. Sequence number: the processing module 702 is specifically configured to delete at least one outbound packet whose TCP sequence number of the end byte is smaller than the second indicated value from the buffered packets.

In some embodiments of the present invention, the sending module 703 is further configured to send a response message to the main controller, and the response message includes the end of the last outgoing message in the buffered messages The TCP sequence number of bytes; the receiving module 704 is also configured to receive a notification message sent by the main controller, the notification message includes a third indication value, and the third indication value indicates the main controller The TCP sequence number of the end byte of the last outbound message that has been processed; the processing module 702 is specifically configured to set the TCP sequence number of the end byte smaller than the second indication from the buffered message at least one outbound packet whose value is not greater than the third indicated value is deleted.

Optionally, the data part of the TCP message includes a sub-message, and the sub-message is a Border Gateway Protocol (BGP) message or a Label Distribution Protocol (LDP) message.

In some embodiments of the present invention, the buffering unit may specifically be configured to buffer the received packets after sorting them according to TCP sequence numbers.

In some embodiments of the present invention, the caching module 701 is further configured to cache the retransmitted message when the forwarder receives the retransmitted message from the main controller or the network device ; said The sending module 703 is further configured to send the retransmitted message and The original message of the retransmitted message is sent to the new main controller together.

In some embodiments of the present invention, the processing module 702 is further configured to identify whether the received outgoing message is a complete Fragmentation of a TCP message; the sending module 703 is also used for if the identification module recognizes that the received outbound message is a fragment of a complete TCP message, then upon receiving the complete TCP After all the fragments of the message are fragmented, start to forward the fragments of the complete TCP message to the network device.

It can be understood that the functions of each functional module of the transponder in the embodiment of the present invention can be specifically implemented according to the method in the above method embodiment, and the specific implementation process can refer to the relevant description in the above method embodiment, and will not be repeated here.

It can be seen from the above that in some feasible implementations of the present invention, a transponder in a communication system is provided. The transponder can receive a message and delete the cached message after confirming that the cached message has been processed. In this paper, if the active and standby controllers switch their identities, they will upload the cached and unprocessed messages to the new active controller, achieving the following technical effects:

By using the forwarder to cache messages for data backup, data backup between the active and standby controllers is avoided, which can reduce the burden on the active and standby controllers, reduce the system load, and effectively improve system efficiency and reliability;

In addition, multiple transponders can be used to cache messages, and the system load can be shared among multiple devices, which can prevent the main controller from becoming a performance bottleneck.

Embodiment seven

Please refer to FIG. 8 , an embodiment of the present invention provides a main controller 800 in a communication system, the communication system includes the main controller, a standby controller, a repeater and a network device, and the repeater is located Between the controller and the network device, it is used to receive the message of the master controller and forward it to the network device, or receive the message of the network device and forward it to the master controller, and the master Controller 600 may include:

A receiving module 801, configured to receive a message from the network device forwarded by the forwarder;

A processing module 802, configured to process the received message;

A sending module 803, configured to send an instruction to the forwarder to indicate that the message has been processed Indication.

In some embodiments of the present invention, the sending module 803 may be specifically configured to send a response message to the transponder, where the response message includes a first indication value, and the first indication value indicates that the main controller has The TCP sequence number of the end byte of the last TCP message that has been processed, and the response message is used by the forwarder to save the TCP sequence number of the end byte in the TCP message cached by itself not greater than the first At least one TCP packet with the indicated value is deleted.

In some embodiments of the present invention, the data part of the TCP message includes a sub-message, and the sub-message is a Border Gateway Protocol (BGP) message or a Label Distribution Protocol (LDP) message.

In some embodiments of the present invention, the processing module 802 is specifically configured to remove the header of the TCP message, obtain the data part of the TCP message; recover from the data part of the TCP message Output a complete sub-message; perform persistent processing on the sub-message.

It can be understood that the functions of each functional module of the transponder in the embodiment of the present invention can be specifically implemented according to the method in the above method embodiment, and the specific implementation process can refer to the relevant description in the above method embodiment, and will not be repeated here.

It can be seen from the above that in some feasible implementation manners of the present invention, a main controller in a communication system is provided, the main controller can send a response message to the transponder, and the response message includes a first indication value, the first indication value indicates the TCP sequence number of the end byte of the last TCP message that the main controller has processed, and the response message is used by the forwarder to store the , the TCP sequence number of the end byte is not greater than at least one TCP message deletion of the first indication value, and the following technical effects are obtained:

It avoids the data backup between the active and standby controllers, which can reduce the burden on the active and standby controllers, reduce the system load, and effectively improve the system efficiency and reliability;

In addition, multiple transponders can be used to cache messages, and the system load can be shared among multiple devices, which can prevent the main controller from becoming a performance bottleneck.

Embodiment eight

Please refer to Fig. 9a, an embodiment of the present invention provides a main controller 900 in a communication system, the communication system includes the main controller, a standby controller, a repeater and a network device, and the repeater is located in the main Between the controller and the network device, it is used to receive the message of the main controller and forward it to the The network device, or receive the message of the network device and forward it to the main controller, the main controller 900 may include:

A sending module 901, configured to send a message to the forwarder, and the message is cached by the forwarder and then sent to the network device;

A processing module 902, configured to process the message;

The sending module 901 is further configured for the main controller to send an indication value for indicating the processed message to the repeater.

In some embodiments of the present invention, as shown in FIG. 9b, the main controller further includes: a receiving module 904;

The receiving module 904 is configured to receive a response message sent by the forwarder, where the response message includes the TCP sequence number of the end byte of the last TCP message that the forwarder has cached;

The processing module 902 is specifically configured to process the TCP message according to the response message;

The sending module 901 is specifically configured to send a notification message to the forwarder, the notification message includes a third indication value, and the third indication value indicates the last TCP message that has been processed by the main controller The TCP sequence number of the end byte of the notification message is used by the forwarder to send the TCP sequence number of the end byte in the cached message not greater than the third indication value and less than the second indication value One or more TCP packets are deleted, and the second indication value indicates the TCP sequence number of the next TCP packet expected to be received by the network device.

In some embodiments of the present invention, the data part of the TCP message includes a sub-message, and the sub-message is a Border Gateway Protocol (BGP) message or a Label Distribution Protocol (LDP) message.

In some embodiments of the present invention, the processing module 902 is specifically configured to obtain routing information of the TCP message, and perform persistent processing on the routing information.

As can be seen from the above, in some feasible implementation manners of the present invention, a master controller in a communication system is provided, and the master controller can send a notification message to the transponder, and the notification message includes a third indication value, the third indication value indicates the TCP sequence number of the end byte of the last TCP message that the main controller has processed, and the notification message is used by the forwarder to convert the buffered message 1. Delete one or more TCP packets whose TCP sequence number of the end byte is not greater than the third indication value and less than the second indication value, and the second indication value indicates that the network device expects to receive the next The TCP serial number of the TCP message has achieved the following technical effects:

It avoids the data backup between the active and standby controllers, which can reduce the burden on the active and standby controllers, reduce the system load, and effectively improve the system efficiency and reliability;

In addition, multiple transponders can be used to cache messages, and the system load can be shared among multiple devices, which can prevent the main controller from becoming a performance bottleneck.

An embodiment of the present invention also provides a computer storage medium, where the computer storage medium can store a program, and when the program is executed, some or all steps of the communication method in the communication system described in the above method embodiments are included.

Referring to FIG. 10 , an embodiment of the present invention further provides a transponder 1000 in a communication system.

The transponder 1000 may be a microprocessor computer or a communication device. For example: the transponder 1000 may be one of portable devices such as a general computer, a customized machine, a mobile terminal or a tablet. The transponder 1000 includes: a processor 1004 , a memory 1006 , a communication interface 1002 and a bus 1008 . The processor 1004, the memory 1006 and the communication interface 1002 are connected through the bus 1008 and complete the mutual communication.

The bus 1008 may be an Industry Standard Architecture (Industry Standard Architecture, referred to as ISA) bus or a Peripheral Component (abbreviated as PCI) bus or an Extended Industry Standard Architecture (Extended Industry Standard Architecture, referred to as EISA) bus etc. The bus can be classified into one or more of address bus, data bus and control bus. For ease of representation, only one thick line is used in FIG. 10 , but it does not mean that there is only one bus or one type of bus.

The memory 1006 is used to store executable program codes including computer operation instructions. When the transponder 1000 executes the program code, the transponder 1000 can complete steps 201-203 of the method embodiment shown in FIG. 2, and can also realize all functions of the transponder 700 in the device embodiment shown in FIG. 7a . The memory 1006 may include a high-speed RAM (Ramdom Access Memory) memory. Optionally, the memory 1006 may further include a non-volatile memory (non-volatile memory). For example, storage 1006 may include disk storage.

The processor 1004 may be a central processing unit (Central Processing Unit, CPU for short), or the processor 1004 may be an Application Specific Integrated Circuit (Application Specific Integrated Circuit, ASIC for short), or processor 1004 may be one or more integrated circuits configured to implement embodiments of the present invention.

The processor 1004 is configured to cache the received message after the forwarder 1000 receives the message from the main controller or the network device; monitor the processing status of the cached message, and delete the cached Messages that have been processed in the message;

The communication interface 1002 is configured to send unprocessed messages among the cached messages to the new master controller when the standby controller is switched to the new master controller.

Optionally, the communication interface 1002 is further configured to receive an indication value sent by the main controller or the network device for indicating a message that has been processed, and delete the cached message according to the indication value. of packets that have been processed.

Optionally, the processor 1004 is further configured to confirm the corresponding TCP connection according to the source IP address, destination IP address, source port and destination port in the header of the received message; Connecting, determining the TCP sequence number of the received message; buffering the received message and the TCP sequence number of the message.

Optionally, the communication interface 1002 is further configured to receive a response message returned by the main controller, where the response message includes a first indication value, and the first indication value indicates that the main controller has processed the last The TCP sequence number of the end byte of the incoming packet;

Optionally, the processor 1004 is further configured to delete at least one incoming packet whose TCP sequence number of the end byte is not greater than the first indication value from the buffered packets

Optionally, the communication interface 1002 is further configured to receive a feedback message returned by the network device, where the feedback message includes a second indication value, and the second indication value indicates the next outbound report that the network equipment expects to receive. The TCP sequence number of the file;

Optionally, the processor 1004 is further configured to, from the cached messages, delete at least one outbound message whose TCP sequence number of the end byte is smaller than the second indication value.

Optionally, the communication interface 1002 is further configured to send a response message to the main controller, the response message including the TCP sequence number of the end byte of the last outbound message in the cached message; receiving The notification message sent by the main controller, the notification message includes a third indication value, and the third indication value indicates the end byte of the last outgoing message that the main controller has processed TCP sequence number; the processor 1004 is further configured to, from the buffered message, at least one outgoing direction whose TCP sequence number of the end byte is less than the second indication value and not greater than the third indication value The message is deleted.

Optionally, the data part of the TCP message includes a sub-message, and the sub-message is a Border Gateway Protocol (BGP) message or a Label Distribution Protocol (LDP) message.

Optionally, the processor 1004 is further configured to sort the received packets according to the TCP sequence numbers and then cache them.

Optionally, the processor 1004 is further configured to buffer the retransmitted message when receiving the retransmitted message from the main controller or the network device;

Optionally, the communication interface 1002 is also used for when the standby controller is switched to be a new master controller, if the retransmitted message is a message that has not been processed, the forwarder sends the retransmitted The transmitted message and the original message of the retransmitted message are sent to the new main controller together.

Optionally, the processor 1004 is further configured to identify whether the received outbound message is a fragment of a complete TCP message according to the fragmentation flag in the message header of the outbound message ;

Optionally, the communication interface 1002 is further configured to start forwarding fragments of the complete TCP message to the network device if the processor 1004 identifies it as yes, after receiving all the fragments of the complete TCP message. piece.

It is worth noting that each functional unit of the network device provided in the embodiment of the present invention may be based on the specific implementation of the functions provided by the method provided in Embodiment 1 and the device provided in the embodiment shown in Figure 6, and the definitions and descriptions of terms It is consistent with Embodiment 1 and Embodiment 6, and will not be repeated here.

It can be seen from the above that in some feasible implementations of the present invention, a transponder in a communication system is provided. The transponder can receive a message and delete the cached message after confirming that the cached message has been processed. In this paper, if the active and standby controllers switch their identities, they will upload the cached and unprocessed messages to the new active controller, achieving the following technical effects:

By using the forwarder to cache messages for data backup, data backup between the active and standby controllers is avoided, which can reduce the burden on the active and standby controllers, reduce the system load, and effectively improve system efficiency and reliability;

In addition, multiple transponders can be used to cache messages, and the system load can be shared among multiple devices, which can prevent the main controller from becoming a performance bottleneck.

Please refer to FIG. 11 , an embodiment of the present invention further provides a main controller 1100 in a communication system.

The master controller 1100 may be a microprocessor computer. For example: the main controller 1100 may be one of portable devices such as a general computer, a customized machine, a mobile terminal or a tablet. The main controller 1100 includes: a processor 1104 , a memory 1106 , a communication interface 1102 and a bus 1108 . The processor 1104, the memory 1106 and the communication interface 1102 are connected through the bus 1108 and complete the mutual communication.

The bus 1108 may be an Industry Standard Architecture (Industry Standard Architecture, referred to as ISA) bus or a Peripheral Component (abbreviated as PCI) bus or an Extended Industry Standard Architecture (Extended Industry Standard Architecture, referred to as EISA) bus etc. The bus can be classified into one or more of address bus, data bus and control bus. For ease of representation, only one thick line is used in FIG. 11 , but it does not mean that there is only one bus or one type of bus.

The memory 1106 is used to store executable program codes including computer operation instructions. When the main controller 1100 executes the program code, the main controller 1100 can complete the steps 501-502 in the fourth embodiment above, and can also realize all the functions of the main controller 800 in the seventh embodiment of the device. The memory 1106 may include a high-speed RAM (Ramdom Access Memory) memory. Optionally, the memory 1106 may further include a non-volatile memory (non-volatile memory). For example, storage 1106 may include disk storage.

The processor 1104 can be a central processing unit (Central Processing Unit, referred to as CPU for short), or the processor 1104 can be a specific integrated circuit (Application Specific Integrated Circuit, referred to as ASIC for short), or the processor 1104 can be configured to implement the present invention One or more integrated circuits of an embodiment of the invention.

a communication interface 1102, configured to receive a message from the network device forwarded by the forwarder;

Processor 1104, configured to process the received message;

The communication interface 1102 is further configured to send, to the transponder, an indication value of the master controller for indicating the message that has been processed.

Optionally, the communication interface 1102 is further configured to send a response message to the repeater, where the response message includes a first indication value, and the first indication value indicates the last TCP that has been processed by the master controller. The TCP sequence number of the end byte of the message, the reply message is used by the forwarder to At least one TCP message whose TCP sequence number of the end byte is not greater than the first indication value in the cached message is deleted.

Optionally, the data part of the TCP message includes a sub-message, and the sub-message is a Border Gateway Protocol (BGP) message or a Label Distribution Protocol (LDP) message.

Optionally, the processor 1104 is further configured to remove the header of the TCP message to obtain the data part of the TCP message; recover the complete sub-message from the data part of the TCP message ; Perform persistent processing on the sub-message.

It is worth noting that each functional unit of the network device provided by the embodiment of the present invention may be based on the specific realization of the functions of the method provided by the fourth embodiment and the device provided by the seventh embodiment. The fourth is consistent with the seventh embodiment, and will not be repeated here.

It can be seen from the above that in some feasible implementation manners of the present invention, a main controller in a communication system is provided, the main controller can send a response message to the transponder, and the response message includes a first indication value, the first indication value indicates the TCP sequence number of the end byte of the last TCP message that the main controller has processed, and the response message is used by the forwarder to store the , the TCP sequence number of the end byte is not greater than at least one TCP message deletion of the first indication value, and the following technical effects are obtained:

It avoids the data backup between the active and standby controllers, which can reduce the burden on the active and standby controllers, reduce the system load, and effectively improve the system efficiency and reliability;

In addition, multiple transponders can be used to cache messages, and the system load can be shared among multiple devices, which can prevent the main controller from becoming a performance bottleneck.

Please refer to FIG. 12 , an embodiment of the present invention further provides a main controller 1200 in a communication system.

The main controller 1200 may be a microprocessor computer. For example: the main controller 1200 may be one of portable devices such as a general computer, a customized machine, a mobile terminal or a tablet. The main controller 1200 includes: a processor 1204 , a memory 1206 , a communication interface 1202 and a bus 1208 . The processor 1204, the memory 1206 and the communication interface 1202 are connected through the bus 1208 and complete mutual communication.

The bus 1208 may be an Industry Standard Architecture (Industry Standard Architecture, referred to as ISA) bus or a Peripheral Component (abbreviated as PCI) bus or an Extended Industry Standard Architecture (Extended Industry Standard Architecture, referred to as EISA) bus, etc. The bus can be classified into one or more of address bus, data bus and control bus. For ease of representation, only one thick line is used in FIG. 12 , but it does not mean that there is only one bus or one type of bus.

The memory 1206 is used to store executable program codes including computer operation instructions. When the main controller 1200 executes the program code, the main controller 1100 can complete steps 601 to 604 in the fifth embodiment above, and can also realize all the functions of the main controller 900 in the eighth embodiment of the device. The memory 1206 may include a high-speed RAM (Ramdom Access Memory) memory. Optionally, the memory 1206 may further include a non-volatile memory (non-volatile memory). For example, storage 1206 may include disk storage.

The processor 1204 may be a central processing unit (Central Processing Unit, referred to as CPU), or the processor 1204 may be a specific integrated circuit (Application Specific Integrated Circuit, referred to as ASIC), or the processor 1204 may be configured to implement the present invention. One or more integrated circuits of an embodiment of the invention.

A communication interface 1202, configured to send a message to the transponder;

a processor 1204, configured to process the sent message;

The communication interface 1202 is configured to send, to the repeater, an indication value of the main controller used to indicate the message that has been processed.

Optionally, the communication interface 1202 is also configured to send the TCP message to the forwarder, and the TCP message is cached by the forwarder and then sent to the network device; receiving the TCP message sent by the forwarder Response message, including the TCP sequence number of the end byte of the last TCP message that the forwarder has cached in the response message; sending a notification message to the forwarder, including a third indication value in the notification message, The third indication value indicates the TCP sequence number of the end byte of the last TCP message that the main controller has processed, and the notification message is used by the forwarder to send the end byte in the buffered message to One or more TCP packets whose TCP sequence number is not greater than the third indication value and less than the second indication value are deleted, and the second indication value indicates the next TCP message that the network device expects to receive TCP sequence number.

Optionally, the data part of the TCP message includes a sub-message, and the sub-message is a Border Gateway Protocol (BGP) message or a Label Distribution Protocol (LDP) message.

Optionally, the processor 1104 is further configured to obtain routing information of the TCP packet, and perform persistent processing on the routing information.

It is worth noting that each functional unit of the network device provided by the embodiment of the present invention may be based on the specific realization of the functions of the method provided by the fifth embodiment and the device provided by the eighth embodiment, and the definitions, descriptions and implementation of the terms The fifth example is consistent with the eighth embodiment, and will not be repeated here.

As can be seen from the above, in some feasible implementation manners of the present invention, a master controller in a communication system is provided, and the master controller can send a notification message to the transponder, and the notification message includes a third indication value, the third indication value indicates the TCP sequence number of the end byte of the last TCP message that the main controller has processed, and the notification message is used by the forwarder to convert the buffered message 1. Delete one or more TCP packets whose TCP sequence number of the end byte is not greater than the third indication value and less than the second indication value, and the second indication value indicates the next TCP packet that the network device expects to receive The TCP sequence number of the text has achieved the following technical effects:

It avoids the data backup between the active and standby controllers, which can reduce the burden on the active and standby controllers, reduce the system load, and effectively improve the system efficiency and reliability;

In addition, multiple transponders can be used to cache messages, and the system load can be shared among multiple devices, which can prevent the main controller from becoming a performance bottleneck.

An embodiment of the present invention also provides a communication system. As shown in FIG. 1a, the communication system includes a master controller, a backup controller, a repeater, and a network device, wherein,

The forwarder is located between the main controller and the network device, and is used to receive the message of the main controller and forward it to the network device, or receive the message of the network device and forward it to the network device. the main controller; and, after receiving the message from the main controller or the network device, cache the received message, monitor the processing status of the cached message, and delete the cached message the packets that have been processed; when the standby controller is switched to a new primary controller, the forwarder sends the unprocessed packets in the buffered packets to the new primary controller device;

The main controller is configured to send a message to the forwarder, process the sent message, or receive a message from the network device forwarded by the forwarder, and process the received message; And, sending the main controller to the forwarder an indication for indicating that the message has been processed value;

The network device is configured to send a message to the forwarder, or receive a message from the main controller forwarded by the forwarder;

The backup controller is configured to switch to a new master controller when the master controller fails;

The communication system avoids data backup between the active and standby controllers, can reduce the burden on the active and standby controllers, lighten the system load, and effectively improve system efficiency and reliability.

In the foregoing embodiments, the descriptions of each embodiment have their own emphases, and for parts not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

It should be noted that for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because Certain steps may be performed in other orders or simultaneously in accordance with the present invention. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium can include: ROM, RAM, disk or CD, etc.

The communication method and equipment in the communication system provided by the embodiment of the present invention have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiment is only used to help understand the present invention. The method of the invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, the content of this specification should not be understood To limit the present invention.

Claims (37)

1. A kind of communication means in communication system, it is characterized in that, the communication system includes master controller, preparation controller, transponder and the network equipment, the transponder is located between the master controller and the network equipment, for receiving the message of the master controller and being transmitted to the network equipment, or receive the message of the network equipment and be transmitted to the master controller, methods described includes：

   The transponder caches the message received after the message from the master controller or the network equipment is received；

   The processing state of the message of the transponder monitoring caching, and delete the message being disposed in the message of the caching；

   When the preparation controller switches to new master controller, the message being not yet disposed in the message of the caching is sent to the new master controller by the transponder.
2. According to the method described in claim 1, it is characterised in that the processing state of the message of transponder monitoring caching, and delete the message being disposed in the message of the caching and include：

   The transponder receives the message being disposed for being used for the indicated value for the message that instruction has been disposed, deleting in the message of the caching according to the indicated value that the master controller or the network equipment are sent.
3. Method according to claim 2, it is characterised in that the message is transmission control protocol TCP message, the message that the caching is received includes：

   Source IP address, purpose IP address, source port and destination interface in the heading for the message that the transponder is received according to, confirm corresponding TCP connections；

   TCP connection of the transponder based on the confirmation, determines the TCP sequence number of the message, the message and the TCP sequence number of the message received received described in caching.
4. Method according to claim 3, it is characterized in that, the message of the caching enters direction message including the network equipment to what the master controller was sent, the transponder monitors the processing state of the message of the caching, and deletes the message being disposed in the message of the caching and include：

   The transponder receives the response message that the main controller is returned, and the response message includes the first indicated value, the first indicated value instruction master controller be disposed last enter direction message end byte TCP sequence number；

   The transponder is according to first indicated value, from the message of the caching, and by the TCP sequence number of end byte is not more than first indicated value, at least one enters the deletion of direction message.
5. Method according to Claims 2 or 3 or 4, it is characterized in that, the message of the caching includes the outgoing packet that the master controller is sent to the network equipment, the transponder monitors the processing state of the message of the caching, and deletes the message being disposed in the message of the caching and include：

   The transponder receives the feedback message that the network equipment is returned, and the feedback message includes the second indicated value, and second indicated value indicates that the network equipment expects the TCP sequence number of next outgoing packet of reception；

   From the message of the caching, at least one outgoing packet that the TCP sequence number of end byte is less than second indicated value is deleted.
6. Method according to claim 5, it is characterised in that also include：

   The transponder sends response message to the master controller, and the response message includes the TCP sequence number of the end byte of last outgoing packet in the message of the caching；

   The transponder receives the notification message that the master controller is sent, and the notification message includes the 3rd indicated value, and the 3rd indicated value indicates the TCP sequence number of the end byte of processed last outgoing packet finished of master controller；

   It is described from the message of the caching, by the TCP sequence number of end byte be less than second indicated value at least one outgoing packet delete include：From the message of the caching, at least one outgoing packet that the TCP sequence number of end byte is less than second indicated value and no more than described 3rd indicated value is deleted.
7. According to any described method in claim 2 to 6, it is characterised in that

   The data division of the TCP message includes sub- message, and the sub- message is Border Gateway Protocol (BGP) message, or tag distribution protocol LDP messages.
8. According to any described method in claim 3 to 6, it is characterised in that the message and the TCP sequence number of the message received received described in the caching includes：

   The transponder is cached after being sorted to the message received according to TCP sequence number.
9. According to any described method in claim 1 to 8, it is characterised in that

   The message received that caches includes：The transponder receives the master controller or the net During the message that network equipment is retransmitted, the message of the re-transmission is cached；

   Described when new master controller is switched to when the preparation controller, the message being not yet disposed in the message of the caching is sent to the new master controller by the transponder to be included：When the preparation controller switches to new master controller, if the message of the re-transmission is still untreated message, the former message of the message of the re-transmission and the message of the re-transmission is sent jointly to the new master controller by the transponder.
10. According to any described method in claim 5 to 6, it is characterised in that also include：

    The transponder indicates position according to the burst in the heading of the outgoing packet, the outgoing packet received described in identification whether be a complete TCP message burst；

    If so, the transponder is after whole bursts of the complete TCP message are received, start to forward the burst of the complete TCP message to the network equipment.
11. A kind of communication means in communication system, it is characterized in that, the communication system includes master controller, preparation controller, transponder and the network equipment, the transponder are located between the master controller and the network equipment, for receiving the message of the master controller and being transmitted to the network equipment, or receive the message of the network equipment and be transmitted to the master controller, methods described includes：

    The master controller receives the message from the network equipment of the transponder forwarding, and the message received is handled；

    The master controller sends the indicated value of the message for indicating to be disposed to the transponder.
12. Method according to claim 11, it is characterised in that the message is transmission control protocol TCP message, the indicated value of message of the master controller to the transponder transmission master controller, for indicating to be disposed includes：

    The master controller sends response message to the transponder, the response message includes the first indicated value, first indicated value indicates the TCP sequence number of the end byte for last TCP message that the master controller has been disposed, and the response message is used to delete at least one TCP message that the TCP sequence number of in the TCP message of own cache, end byte is not more than first indicated value by the transponder.
13. Method according to claim 11 or 12, it is characterised in that

    The data division of the TCP message includes sub- message, and the sub- message is Border Gateway Protocol (BGP) message, or tag distribution protocol LDP messages.
14. Method according to claim 13, it is characterised in that the described pair of message progress processing received includes：

    The heading of the TCP message is removed, the data division of the TCP message is obtained；

    Complete sub- message is recovered from the data division of the TCP message；

    Persistence processing is carried out to the sub- message.
15. A kind of communication means in communication system, it is characterized in that, the communication system includes master controller, preparation controller, transponder and the network equipment, the transponder are located between the master controller and the network equipment, for receiving the message of the master controller and being transmitted to the network equipment, or receive the message of the network equipment and be transmitted to the master controller, methods described includes：

    The master controller sends message to the transponder, and the message of transmission is used to send to the network equipment after caching by the transponder；

    The main control is handled the message of the transmission；

    The master controller sends the indicated value of the message for indicating to be disposed to the transponder.
16. Method according to claim 15, it is characterised in that the message is transmission control protocol TCP message, the main control includes to message progress processing：

    The main control receives the response message that the transponder is sent, and the response message includes the TCP sequence number of the end byte for last TCP message that the transponder has been cached；

    The main control is handled the TCP message according to the response message；

    The indicated value of message of the master controller to the transponder transmission master controller, for indicating to be disposed includes：

    The master controller sends a notification message to the transponder, the notification message includes the 3rd indicated value, 3rd indicated value indicates the TCP sequence number of the end byte for last TCP message that the master controller has been disposed, the notification message is not more than the 3rd indicated value by the TCP sequence number that the transponder is used in the message that will cache, end byte and one or more TCP messages less than the second indicated value are deleted, and second indicated value indicates that the network equipment expects the TCP sequence number of next TCP message received.
17. Method according to claim 15 or 16, it is characterised in that

    The data division of the TCP message includes sub- message, and the sub- message is Border Gateway Protocol (BGP) report Text, or tag distribution protocol LDP messages.
18. Method according to claim 17, it is characterised in that the master controller includes to TCP message progress processing：

    The routing iinformation of the TCP message is obtained, persistence processing is carried out to the routing iinformation.
19. A kind of transponder in communication system, it is characterized in that, the communication system includes master controller, preparation controller, the transponder and the network equipment, the transponder is located between the master controller and the network equipment, for receiving the message of the master controller and being transmitted to the network equipment, or receive the message of the network equipment and be transmitted to the master controller, the transponder includes：

    Cache module, after receiving the message from the master controller or the network equipment in the transponder, caches the message received；

    Processing module, the processing state of the message for monitoring caching, and delete the message being disposed in the message of the caching；

    Sending module, for when the preparation controller switches to new master controller, the message being not yet disposed in the message of the caching to be sent into the new master controller.
20. Transponder in communication system according to claim 19, it is characterised in that

    The transponder also includes：Receiving module, for receive it is that the master controller or the network equipment are sent, for the indicated value for the message for indicating to be disposed；

    The message being disposed in message of the residing processing module specifically for deleting the caching according to the indicated value.
21. Transponder in communication system according to claim 20, it is characterised in that the message is transmission control protocol TCP message, the cache module includes：

    Confirmation unit, for source IP address, purpose IP address, source port and the destination interface in the heading of the message received according to, confirms corresponding TCP connections；

    Determining unit, for the TCP connections based on the confirmation, determines the TCP sequence number of the message；

    Buffer unit, the TCP sequence number for caching the message received and the message received.
22. Transponder in communication system according to claim 21, it is characterised in that the message of the caching enters direction message including the network equipment to what the master controller was sent,

    The transponder also includes：Receiving module, for receiving the response message that the main controller is returned, the response message includes the first indicated value, the first indicated value instruction master controller be disposed last enter direction message end byte TCP sequence number；

    The processing module is specifically for from the message of the caching, and by the TCP sequence number of end byte is not more than first indicated value, at least one enters direction message deletion.
23. The transponder in communication system according to claim 20 or 21 or 22, it is characterised in that the message of the caching includes the outgoing packet that the master controller is sent to the network equipment,

    The transponder also includes：Receiving module, for receiving the feedback message that the network equipment is returned, the feedback message includes the second indicated value, and second indicated value indicates that the network equipment expects the TCP sequence number of next outgoing packet of reception；

    The processing module is specifically for from the message of the caching, at least one outgoing packet that the TCP sequence number of end byte is less than second indicated value is deleted.
24. Transponder in communication system according to claim 23, it is characterised in that

    The sending module, is additionally operable to send response message to the master controller, the response message includes the TCP sequence number of the end byte of last outgoing packet in the message of the caching；

    The receiving module, it is additionally operable to receive the notification message that the master controller is sent, the notification message includes the 3rd indicated value, and the 3rd indicated value indicates the TCP sequence number of the end byte of processed last outgoing packet finished of master controller；

    The processing module is specifically for from the message of the caching, at least one outgoing packet that the TCP sequence number of end byte is less than second indicated value and no more than described 3rd indicated value is deleted.
25. According to the transponder in any described communication system of claim 19 to 24, it is characterised in that

    The data division of the TCP message includes sub- message, and the sub- message is Border Gateway Protocol (BGP) message, or tag distribution protocol LDP messages.
26. According to the transponder in any described communication system of claim 21 to 24, it is characterised in that

    The buffer unit, specifically for being cached after being sorted to the message received according to TCP sequence number.
27. According to the transponder in any described communication system of claim 20 to 26, it is characterised in that

    The cache module, is additionally operable to receive the master controller in the transponder or the network is set During the message of standby re-transmission, the message of the re-transmission is cached；

    The sending module, it is additionally operable to when the preparation controller switches to new master controller, if the message of the re-transmission is still untreated message, the former message of the message of the re-transmission and the message of the re-transmission is sent jointly to the new master controller by the transponder.
28. According to the transponder in any described communication system of claim 23 to 24, it is characterised in that

    The processing module, is additionally operable to the burst sign position in the heading according to the outgoing packet, the outgoing packet that receives described in identification whether be a complete TCP message burst；

    The sending module, if being additionally operable to the identification module identifies that the outgoing packet received is the burst of a complete TCP message, then after whole bursts of the complete TCP message are received, start to forward the burst of the complete TCP message to the network equipment.
29. A kind of master controller in communication system, it is characterized in that, the communication system includes the master controller, preparation controller, transponder and the network equipment, the transponder are located between the master controller and the network equipment, for receiving the message of the master controller and being transmitted to the network equipment, or receive the message of the network equipment and be transmitted to the master controller, the master controller includes：

    Receiving module, the message from the network equipment for receiving the transponder forwarding；

    Processing module, for handling the message received；

    Sending module, the indicated value for sending the message for indicating to be disposed to the transponder.
30. Master controller in communication system according to claim 29, it is characterised in that the message is transmission control protocol TCP message,

    Sending module, specifically for sending response message to the transponder, the response message includes the first indicated value, first indicated value indicates the TCP sequence number of the end byte for last TCP message that the master controller has been disposed, and the response message is used to delete at least one TCP message that the TCP sequence number of in the TCP message of own cache, end byte is not more than first indicated value by the transponder.
31. The master controller in communication system according to claim 29 or 30, it is characterised in that

    The data division of the TCP message includes sub- message, and the sub- message is Border Gateway Protocol (BGP) message, or tag distribution protocol LDP messages.
32. Master controller in communication system according to claim 31, it is characterised in that

    The processing module is specifically for by the heading removal of the TCP message, obtaining the data division of the TCP message；Complete sub- message is recovered from the data division of the TCP message；Persistence processing is carried out to the sub- message.
33. A kind of master controller in communication system, it is characterized in that, the communication system includes master controller, preparation controller, transponder and the network equipment, the transponder are located between the master controller and the network equipment, for receiving the message of the master controller and being transmitted to the network equipment, or receive the message of the network equipment and be transmitted to the master controller, the master controller includes：

    Sending module, for sending message to the transponder, the message is used to send to the network equipment after caching by the transponder；

    Processing module, for handling the message；

    The sending module, is additionally operable to the indicated value that the master controller sends the message for indicating to be disposed to the transponder.
34. Master controller in communication system according to claim 33, it is characterised in that

    The master controller also includes：Receiving module, for receiving the response message that the transponder is sent, the response message includes the TCP sequence number of the end byte for last TCP message that the transponder has been cached；

    The processing module, specifically for being handled according to the response message the TCP message；

    The sending module, specifically for being sent a notification message to the transponder, the notification message includes the 3rd indicated value, 3rd indicated value indicates the TCP sequence number of the end byte for last TCP message that the master controller has been disposed, the notification message is used in the message that will cache by the transponder, the TCP sequence number of end byte is not more than the 3rd indicated value and one or more TCP messages less than the second indicated value are deleted, second indicated value indicates that the network equipment expects the TCP sequence number of next TCP message of reception.
35. The master controller in communication system according to claim 33 or 34, it is characterised in that

    The data division of the TCP message includes sub- message, and the sub- message is Border Gateway Protocol (BGP) message, or tag distribution protocol LDP messages.
36. Master controller in communication system according to claim 35, it is characterised in that

    The processing module, the routing iinformation specifically for obtaining the TCP message, persistence processing is carried out to the routing iinformation.
37. A kind of communication system, it is characterised in that the communication system includes master controller, preparation controller, transponder and the network equipment, wherein,

    The transponder is located between the master controller and the network equipment, for receiving the message of the master controller and being transmitted to the network equipment, or receives the message of the network equipment and be transmitted to the master controller；And, after the message from the master controller or the network equipment is received, the message received is cached, the processing state of the message of caching is monitored, and deletes the message being disposed in the message of the caching；When the preparation controller switches to new master controller, the message being not yet disposed in the message of the caching is sent to the new master controller by the transponder；

    The master controller is used to send message to the transponder, and the message of transmission is handled, or, the message from the network equipment of the transponder forwarding is received, the message received is handled；And, the indicated value of the message for indicating to be disposed is sent to the transponder；

    The network equipment is used to send message to the transponder, or, receive the message from the master controller of the transponder forwarding；

    The preparation controller, in the master controller fault, switching to new master controller.