CN111756588B - Communication link detection method and related device - Google Patents

Abstract

A communication link detection method and a related device belong to the technical field of networks. The first network device sends a link detection request message to the second network device through the communication link in the nth detection cycle, and receives the link detection response message sent by the second network device through the communication link. The detection response message includes the number of messages received and the number of messages sent by the second network device through the communication link in the m detection cycles before the n detection cycle. The first network device determines the number of packets sent and received by the first network device through the communication link within m detection periods, and according to the packets sent by the first network device within m detection periods The number of received packets and the number of packets received and sent by the second network device within m detection periods determine the packet loss amount of the first communication link. The application is able to determine the network quality of the communication link.

Description

Communication link detection method and related device

technical field

The present application relates to the field of network technology, in particular to a communication link detection method and a related device.

Background technique

A communication network, such as a software-defined wide area network (SD-WAN), usually includes multiple network devices and multiple hosts, communication links are established between the network devices, and the hosts communicate with the network devices. The network device forwards the data packets of the host through the communication link to realize the data communication between the hosts. In order to ensure communication reliability, network devices usually need to detect communication links.

Currently, a network device may use a bidirectional forwarding detection (bidirectional forwarding detection, BFD) technology to detect a communication link. The detection process includes: after the network devices at both ends of the communication link establish a BFD session, they respectively send a link detection request message to the peer device through the communication link, and receive the link detection request message returned by the peer device for the link detection request message. If within a certain period of time, the network devices at the two ends do not receive the link detection response message returned by the peer device, the network devices at the two ends determine that the communication link is faulty.

However, the BFD technology can only determine whether the communication link is faulty, but cannot determine the network quality of the communication link.

Contents of the invention

Embodiments of the present application provide a communication link detection method and a related device, which can determine the network quality of the communication link. Described technical scheme is as follows:

In the first aspect, a method for detecting a communication link is provided, which is used for a first network device in a communication network. The communication network includes a first network device and a second network device, and a relationship is established between the first network device and the second network device. A first communication link, the method comprising:

In the nth detection cycle, send a first link detection request message to the second network device through the first communication link, where n>1, and n is an integer;

Receive the first link detection response message sent by the second network device for the first link detection request message through the first communication link, the first link detection response message includes the second network device in the nth detection period The number of packets received through the first communication link in the previous m detection periods, and the number of packets sent by the second network device through the first communication link within the m detection periods, n>m≥1 , and m is an integer;

determining the number of packets sent by the first network device through the first communication link within the m detection periods, and the number of packets received by the first network device through the first communication link within the m detection periods ;

According to the number of packets sent by the first network device through the first communication link within the m detection periods, and the number of packets received by the second network device through the first communication link within the m detection periods, the first The number of packets sent by the second network device through the first communication link within the m detection periods, and the number of packets received by the first network device through the first communication link within the m detection periods are determined The packet loss amount of the first communication link, where the packet loss amount is used to characterize the network quality of the first communication link.

Since the number of packets sent and received by the first network device through the first communication link within the m detection periods can be used, and the second network device passes the first communication link within the m detection periods The number of packets sent by the communication link and the number of packets received determine the amount of packet loss of the first communication link, which is used to characterize the network quality of the first communication link, so the technology provided in the embodiment of this application Scenarios can determine the network quality of communication links.

Optionally, determine the number of packets sent by the first network device through the first communication link within the m detection periods, and the first network device receives the packets through the first communication link within the m detection periods The number of messages, including:

For the i-th detection cycle in the m detection cycles, count the messages sent through the first communication link from the moment when the link detection request message of the i-th detection cycle is sent through the first communication link The number of messages, until the moment when the link detection request message of the i+1 detection cycle is sent through the first communication link, the statistics are stopped, and the counted number of sent messages is determined as the first network device in the i-th The number of messages sent through the first communication link in the first detection cycle, the i-th detection cycle is any detection cycle in the m detection cycles, 1≤i≤m, and i is an integer; according to the first The number of packets sent by a network device through the first communication link in each of the m detection cycles, determining the number of packets sent by the first network device through the first communication link in the m detection cycles number of messages;

For the i-th detection cycle in the m detection cycles, start counting the link detection response message received through the first communication link from the moment when the link detection response message of the i-th detection cycle is received through the first communication link The number of messages, until the moment when the link detection response message of the i+1 detection period is received through the first communication link, the statistics are stopped, and the number of received messages counted is determined as the first network device in the said The number of packets received through the first communication link in the i-th detection cycle; determined according to the number of packets received by the first network device through the first communication link in each detection cycle of the m detection cycles The number of packets received by the first network device through the first communication link within the m detection periods.

In the second aspect, a method for detecting a communication link is provided, which is used for a second network device in a communication network. The communication network includes a first network device and a second network device, and a relationship is established between the first network device and the second network device. A first communication link, the method comprising:

In the nth detection cycle, receive the first link detection request message sent by the first network device through the first communication link, the first link detection request message includes the first network device before the nth detection cycle The number of messages sent through the first communication link within m detection periods, n>m≥1, and both n and m are integers;

Sending a first link detection response message to the first network device through the first communication link according to the first link detection request message;

In the n+1th detection period, receive a second link detection request message sent by the first network device through the first communication link, the second link detection request message includes the first network device in the m detection The number of messages received through the first communication link within the period;

determining the number of packets received by the second network device through the first communication link within the m detection periods, and the number of packets sent by the second network device through the first communication link within the m detection periods ;

According to the number of packets sent by the first network device through the first communication link within the m detection periods, and the number of packets received by the second network device through the first communication link within the m detection periods, the first The number of packets sent by the second network device through the first communication link within the m detection periods, and the number of packets received by the first network device through the first communication link within the m detection periods are determined The packet loss amount of the first communication link, where the packet loss amount is used to characterize the network quality of the first communication link.

Since the number of packets sent and received by the first network device through the first communication link within the m detection periods can be used, and the second network device passes the first communication link within the m detection periods The number of packets sent by the communication link and the number of packets received determine the amount of packet loss of the first communication link, which is used to characterize the network quality of the first communication link, so the technology provided in the embodiment of this application Scenarios can determine the network quality of communication links.

Optionally, determine the number of packets received by the second network device through the first communication link within the m detection periods, and send the second network device through the first communication link within the m detection periods The number of messages, including:

For the i-th detection cycle in the m detection cycles, start counting the link detection request message received through the first communication link from the moment when the link detection request message of the i-th detection cycle is received through the first communication link The number of messages, until the moment when the link detection request message of the i+1 detection cycle is received through the first communication link, the statistics are stopped, and the number of received messages counted is determined as the second network device in the said The number of messages received through the first communication link in the i-th detection cycle, the i-th detection cycle is any one of the m detection cycles, 1≤i≤m, and i is an integer; According to the number of packets received by the second network device through the first communication link in each of the m detection periods, determine that the second network device passes through the first communication link within the m detection periods The number of received messages;

For the i-th detection cycle in the m detection cycles, count the messages sent through the first communication link from the moment when the link detection response message of the i-th detection cycle is sent through the first communication link The number of messages is stopped until the moment when the link detection response message of the i+1 detection period is sent through the first communication link, and the counted number of sent messages is determined as the number of messages sent by the second network device in the i-th The number of packets sent through the first communication link in each detection cycle; according to the number of packets sent by the second network device through the first communication link in each detection cycle of the m detection cycles, determine the second The number of packets sent by the network device through the first communication link within the m detection periods.

Optionally, in the first aspect or the second aspect above, the number of packets sent by the first network device through the first communication link during the m detection periods includes: The number of data packets sent through the first communication link and the number of link detection request packets within the cycle; the number of packets received by the first network device through the first communication link within the m detection cycles includes: The number of data packets and the number of link detection response packets received by the first network device through the first communication link within the m detection periods; the second network device passes the first communication link within the m detection periods The number of packets received by the communication link includes: the number of data packets and the number of link detection request packets received by the second network device through the first communication link within the m detection periods; The number of packets sent through the first communication link within the m detection periods includes: the number of data packets sent by the second network device through the first communication link within the m detection periods and the link detection response The number of messages.

Optionally, in the above first or second aspect, the first link detection request message is a spontaneous message of the first network device. In this way, the sending interval (that is, the detection period) of the link detection request message can be flexibly configured according to needs, thereby improving the flexibility, precision and sensitivity of detection.

Optionally, in the first aspect or the second aspect above, the detection period is 100 milliseconds. In this way, intelligent route selection can be realized in a relatively short period of time.

Optionally, in the first aspect or the second aspect above, m=10, n-m=1.

In a third aspect, a communication link detection device is provided, the communication link detection device includes at least one module, and the at least one module is used to implement the communication link provided in the first aspect or any optional mode of the first aspect road detection method.

In a fourth aspect, a communication link detection device is provided, the communication link detection device includes at least one module, and the at least one module is used to implement the communication link provided in the second aspect or any optional manner of the second aspect. road detection method.

In the solution provided by the embodiment of the present application, since the number of packets sent and the number of packets received in statistics include the number of data packets and link detection packets (including link detection request packets and link detection response packets) ), in this way, it is determined that the network quality of the communication link is closer to the network quality of the communication link actually used by the host, and the detection reliability is higher. In addition, the link detection messages exchanged between network devices can carry the last m statistics of the number of messages. In this way, when a certain link detection message is lost, the network device can detect The statistical result carried in the link detection message after the message restores the lost link detection message, further improving the reliability of detection.

In a fifth aspect, a computer-readable storage medium is provided. Instructions are stored in the computer-readable storage medium. When the instructions are run on a processing component of a computer, the processing component executes any one of the first aspect or the first aspect. The communication link detection method provided by the optional mode.

According to a sixth aspect, a computer-readable storage medium is provided. Instructions are stored in the computer-readable storage medium. When the instructions are run on a processing component of a computer, the processing component executes any one of the second aspect or the second aspect. The communication link detection method provided by the optional mode.

In a seventh aspect, a computer program product including instructions is provided, and when the computer program product is run on a computer, the computer is made to execute the communication link detection method provided in the first aspect or any optional manner of the first aspect.

In an eighth aspect, a computer program product including instructions is provided, and when the computer program product is run on a computer, the computer is made to execute the communication link detection method provided in the second aspect or any optional manner of the second aspect.

In the ninth aspect, there is provided a chip, the chip includes a programmable logic circuit and/or program instructions, and when the chip is running, it is used to realize the communication link detection provided by the first aspect or any optional method of the first aspect method.

In a tenth aspect, a chip is provided, the chip includes a programmable logic circuit and/or program instructions, and when the chip is running, it is used to realize the communication link detection provided by the second aspect or any optional method of the second aspect method.

In the eleventh aspect, a communication link detection system is provided, the communication link detection system includes a first network device and a second network device, the first network device includes the communication link detection device provided in the third aspect, and the second network device The network equipment includes the device for detecting a communication link provided in the fourth aspect.

In the technical solution provided by the embodiment of this application, the first network device sends the first link detection request message to the second network device through the first communication link in the nth detection period, and receives the second link detection request message through the first communication link. The first link detection response message sent by the network device, the first link detection response message includes the number of messages received by the second network device through the first communication link in the m detection cycles before the n detection cycle and the number of packets sent, and the first network device can determine the number of packets sent and received by the first network device through the first communication link within the m detection periods, and then the first network device can be based on The number of packets sent and received by the first network device through the first communication link within the m detection periods, and the number of packets sent by the second network device through the first communication link within the m detection periods The number of messages and the number of received messages determine the amount of packet loss of the first communication link, which is used to characterize the network quality of the first communication link, so the technical solution provided by the embodiment of the application can determine the road network quality.

Description of drawings

FIG. 1 is a schematic diagram of an implementation environment involved in an embodiment of the present application;

FIG. 2 is a signaling diagram of a communication link detection method provided in an embodiment of the present application;

FIG. 3 is a schematic diagram of a method for detecting a communication link provided in an embodiment of the present application;

FIG. 4 is a schematic diagram of a logic structure of a communication link detection device provided in an embodiment of the present application;

FIG. 5 is a schematic diagram of a logic structure of another communication link detection device provided in an embodiment of the present application;

FIG. 6 is a schematic diagram of a hardware structure of a device for detecting a communication link provided by an embodiment of the present application.

detailed description

In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.

In a communication network, a communication link is established between network devices, and the network device forwards a data packet of a host through the communication link to realize data communication between hosts. In order to ensure the reliability of data communication between hosts, network devices usually need to detect communication links and select routes based on the detection results. At present, solutions for detecting communication links mainly include: using BFD technology to detect communication links and using Internet Protocol (Internet Protocol, IP) flow performance management (flow performance management, FPM) technology to detect communication links. However, the use of BFD technology can only determine whether the communication link is faulty, and cannot determine the network quality of the communication link. The use of IP FPM technology to detect communication links needs to rely on the clock synchronization of the Network Time Protocol (NTP), and the detection is flexible. The performance, precision and sensitivity are all low, and it is usually detected once every 10 seconds, so it is impossible to realize route selection in a short period of time (less than 10 seconds, for example, 3 seconds).

Embodiments of the present application provide a communication link detection method and a related device, which can not only detect whether the communication link is faulty, but also determine the network quality of the communication link, and have high flexibility, precision and sensitivity. Among them, the network quality of the communication link can be the packet loss amount of the communication link, the packet loss rate of the communication link, the time delay of the communication link or the jitter of the communication link, etc. The amount of packet loss within, the delay may be at least one of a one-way delay and a two-way delay, and the jitter may be determined based on the delay. The solution of the embodiment of the present application will be described below mainly by taking the network quality of the communication link as the packet loss amount of the communication link as an example.

Please refer to FIG. 1, which shows a schematic diagram of an implementation environment involved in the embodiment of the present application. The implementation environment provides a communication network, which may be SD-WAN, and the communication network includes multiple network devices and There are multiple hosts, communication links are established between the network devices, and the hosts communicate with the network devices. The network device forwards the data packets of the host through the communication link to realize the data communication between the hosts.

Exemplarily, in FIG. 1, a plurality of network devices including network devices 001-003, and a plurality of hosts including hosts 004-005 are used as an example for illustration. A communication link L12 is established between network device 001 and network device 002, and network device 001 and A communication link L13 is established between the network devices 003, a communication link L23 and a communication link L213 are established between the network device 002 and the network device 003, and the communication link L213 is composed of the communication link L12 and the communication link L13; the host 004 communicates with the network device 002, and the host 005 communicates with the network device 003. The network device 002 can forward the data message of the host 004 to the network device 003 through the communication link L23, and can also forward the data message of the host 004 to the network device 003 through the communication link L213, so that the data message of the network device 003 The message is forwarded to the host 005 to realize the data communication between the host 004 and the host 005; the network device 003 can forward the data message of the host 005 to the network device 002 through the communication link L23, and can also transmit the data message of the host 005 to the network device 002 through the communication link L213. The data message of 005 is forwarded to the network device 002, so that the network device 002 forwards the data message to the host 004, so as to realize the data communication between the host 005 and the host 004.

Network devices usually need to detect communication links to select routes according to the detection results, so as to ensure the reliability of data communication between hosts. For example, the network device 002 needs to detect the communication link L23 and the communication link L213, so as to select a communication link among the communication link L23 and the communication link L213 to forward the data message, for example, the network quality of the communication link L23 When it is poor, the network device 002 switches the data message to the communication link L213 for forwarding; similarly, the network device 003 needs to detect the communication link L23 and the communication link L213, so as to select between the communication link L23 and the communication link L213 A communication link forwards the data message. For example, when the network quality of the communication link L213 is poor, the network device 003 switches the data message to the communication link L23 for forwarding. Through the above route selection, the reliability of data communication between the host 004 and the host 005 can be guaranteed.

Wherein, in the implementation environment shown in FIG. 1, each of the network devices 001-003 may be a switch, an access router (access router, AR) and other devices used to forward data packets in a communication network, and the network Devices 001 to 003 can be the same network devices. For example, network devices 001 to 003 can all be ARs, or network devices 001 to 003 can be different network devices. For example, network devices 001 and 002 are ARs. Device 003 is a switch. Each of the hosts 004-005 may be a communication device with a wireless communication function, for example, each of the hosts 004-005 may be a smart phone, a tablet computer, a desktop computer, or an Internet of Things (Internet of things, IoT) devices, etc., and the hosts 004-005 can be the same communication devices, for example, the hosts 004-005 can all be smart phones, or the hosts 004-005 can be different communication devices, for example, the host 004 is a smart phone, and the host 005 It is an IoT device. Among them, IoT devices can be household appliances, smart homes, vehicles, tool equipment, service equipment, service facilities or wearable devices, etc. IoT devices are for example but not limited to: smart refrigerators, smart washing machines, smart water meters, smart electricity meters, smart cars , in-vehicle devices or wearable devices, etc.

It should be pointed out that, for the convenience of description, the communication link L213 is shown in the form of a dotted line in FIG. (that is, L213=L12+L13), rather than a link independent of the communication link L12 and the communication link L13. In some scenarios, the communication link described in the embodiment of the present application may also be called a communication path, a communication tunnel, or a tunnel path, etc., and it is easy to understand that each of the communication link L12, the communication link L13, and the communication link 23 A communication link may be a transport network.

It should also be pointed out that the communication network shown in FIG. 1 is only used as an example, and is not used to limit the technical solutions of the embodiments of the present application. Those skilled in the art should understand that in the specific implementation process, the communication network may also include other devices. For example, the communication network may also include a control device. The control device may be a controller, for example, and the control device may send Network configuration information to facilitate the establishment of the above-mentioned communication link. And it is easy to understand that in a specific implementation process, the number of network devices can be configured according to needs.

Please refer to FIG. 2, which shows a signaling diagram of a communication link detection method provided by an embodiment of the present application. The communication link detection method can be applied to a communication network, and the communication network includes a first network device and a second network device. A network device, a first communication link is established between the first network device and the second network device. Referring to Figure 2, the method may include the following steps:

Step 201, the first network device determines the number of packets sent by the first network device through the first communication link in the m detection cycles before the n detection cycle.

Wherein, the number of packets sent by the first network device through the first communication link in the m detection periods before the n detection period may include: The number of data packets sent by the link and the number of link detection request packets, n>m≥1, and both n and m are integers. Since the first communication link is a communication link between the first network device and the second network device, it is easy to understand that the data packet and the link detection request message sent by the first network device through the first communication link The receiving end is the second network device.

Optionally, n-m=1, that is, the mth detection period among the m detection periods is adjacent to the nth detection period; further optionally, m=10, that is, the first network device Determine the number of packets sent by the first network device through the first communication link in the 10 detection cycles before the nth detection cycle, and the 10th detection cycle in the 10 detection cycles is the same as the nth detection cycle adjacent. For example, T represents the detection cycle, when n=13, the nth detection cycle can be the detection cycle T13, then the 10 detection cycles before the nth detection cycle can be the detection cycle T3 ~ T12, the 10 detection cycles The tenth detection cycle in the cycle may be the detection cycle T12.

In this embodiment of the application, the link detection request message may be a spontaneous message sent by the first network device, and the spontaneous message refers to a message generated and sent by the first network device for detecting a communication link , the data packet sent by the first network device refers to a packet generated by the host and forwarded by the first network device, and the data packet is used for communication between hosts. Since the link detection request message can be a spontaneous message of the first network device, the sending interval (that is, the detection period) of the link detection request message can be configured according to actual needs. In this way, the communication link can be improved. Detection flexibility, precision and sensitivity. Exemplarily, the detection period may be 100 milliseconds. It is easy to understand that the detection period of 100 milliseconds is only exemplary. In practical applications, the detection period can be flexibly configured, and the detection period can be less than 100 milliseconds or greater than 100 milliseconds.

Optionally, the first network device determining the number of packets sent by the first network device through the first communication link within the m detection periods may include: for the i-th detection period in the m detection periods, The first network device counts the number of packets sent through the first communication link from the moment when the link detection request packet of the i-th detection period is sent through the first communication link until the number of packets sent through the first communication link Stop counting at the moment of the link detection request message in the i+1 detection cycle, and determine the number of packets sent that have been counted as being sent by the first network device through the first communication link in the i-th detection cycle number of packets; for each detection cycle in the m detection cycles, the first network device may determine that the first network device passes the first detection cycle in each detection cycle in the same manner as the ith detection cycle The number of packets sent by a communication link, and then, the first network device can determine the number of packets sent by the first network device through the first communication link in each of the m detection cycles in each detection cycle. The number of packets sent by a network device through the first communication link within the m detection periods. Wherein, the i-th detection period is any one of the m detection periods, 1≤i≤m, and i is an integer.

Optionally, the first network device may have a communication interface and a processor, and the processor may have a timing function and a counting function. For the i-th detection period, when the starting moment of the i-th detection period arrives, the processor triggers the communication interface to send the link detection request message of the i-th detection period through the first communication link At the same time, the processor starts to count the number of packets sent by the first network device through the first communication link in the i-th detection cycle, and when the start moment of the i+1th detection cycle arrives, the processor triggers the communication interface to pass The first communication link sends the link detection request message of the i+1 detection cycle, and stops counting the number of messages sent by the first network device through the first communication link in the i-th detection cycle, and processes The device can count the sent packets within the time period (that is, the time period between the start time of the i-th detection cycle and the start time of the i+1-th detection cycle) The number is determined as the number of packets sent by the first network device through the first communication link within the i-th detection period. It should be noted that the number of packets sent by the first network device through the first communication link during the ith detection period includes the number of packets sent by the first network device through the first communication link during the ith detection period The number of link detection request packets and the number of data packets. It is easy to understand that the number of link detection request packets sent by the first network device through the first communication link in each detection period is usually one.

For example, the number of packets sent by the first network device through the first communication link within the i-th detection period may be S1_SC[i]. The number of packets sent by the first network device through the first communication link within the m detection periods may be S1_SC[1~m], and S1_SC[1~m] includes S1_SC[m], S1_SC[m-1] , S1_SC[m-2], S1_SC[i]...S1_SC[1], S1_SC[m] indicates that the first network device passes the first The number of packets sent by the communication link, S1_SC[m-1] indicates the number of packets sent by the first network device through the first communication link in the m-1th detection cycle among the m detection cycles, in order By analogy, S1_SC[1] represents the number of packets sent by the first network device through the first communication link in the first detection cycle among the m detection cycles. It should be pointed out that the process of detecting the first communication link is continuously executed, and the first detection cycle among the m detection cycles may be the first detection cycle of the first communication link, or may not be the first detection cycle. The first detection cycle of the communication link.

Step 202, the first network device sends a first link detection request message to the second network device through the first communication link in the nth detection cycle, the first link detection request message includes the first network device in the The number of packets sent through the first communication link within the m detection periods.

The first link detection request packet is a spontaneous packet of the first network device.

In this embodiment of the present application, the first network device may send the first link detection request message to the second network device through the first communication link when the start moment of the nth detection period arrives.

Optionally, when the start moment of the nth detection period arrives, the first network device may first generate a first link detection request message, and then send the first link detection request message to the second network device through the first communication link. Detect request packets. Wherein, the first link detection request message includes the number of messages sent by the first network device through the first communication link within the m detection periods. Exemplarily, the first link detection request message includes S1_SC[1~m].

The description of the information contained in the first link detection request packet in this embodiment of the present application is only exemplary, and those skilled in the art should understand that the first link detection request packet may also include other information, for example, the first The link detection request message may also include the type (request type or response type) of the first link detection request message, the sequence number of the first link detection request message, and the first link detection request message. Sending time stamps S1_STn, etc., where S1_STn represents the time stamp of the link detection request message sent by the first network device through the first communication link in the nth detection cycle.

Step 203, the second network device receives the first link detection request message sent by the first network device through the first communication link in the nth detection period.

After receiving the first link detection request message, the second network device may parse the first link detection request message to obtain the message sent by the first network device through the first communication link within the m detection periods The number of packets sent by the first network device through the first communication link within the m detection periods may be S1_SC[1~m]. It is easy to understand that the second network device can also obtain the type of the first link detection request message, the serial number of the first link detection request message, and the first link detection request message by analyzing the first link detection request message. The sending time stamp S1_STn and other information.

Optionally, the second network device may determine the receiving timestamp S2_RTn of the first link detection request message. When the first link detection request message also includes the sending timestamp S1_STn of the first link detection request message, The second network device may determine the first one-way delay of the first communication link according to the receiving timestamp S2_RTn of the first link detection request message and the sending timestamp S1_STn of the first link detection request message. Exemplarily, the first one-way time delay may be ΔTn1=S2_RTn−S1_STn. S2_RTn indicates the time stamp when the second network device receives the link detection request message through the first communication link in the nth detection period, and △Tn1 indicates the first one-way time of the first communication link in the nth detection period Delay, the first one-way delay refers to the delay of the first communication link in the first direction, and the first direction refers to the direction from the first network device to the second network device.

Step 204, the second network device determines the number of packets received by the second network device through the first communication link within the m detection periods in the nth detection period.

Wherein, the number of packets received by the second network device through the first communication link within the m detection periods may include: datagrams received by the second network device through the first communication link within the m detection periods The number of messages and the number of link detection request messages. Since the first communication link is a communication link between the first network device and the second network device, it is easy to understand that the data packet and the link detection request message received by the second network device through the first communication link The sending ends are all first network devices. As described in step 201, the link detection request packet may be a spontaneous packet of the first network device.

Optionally, the second network device determining the number of packets received by the second network device through the first communication link within the m detection periods may include: for the i-th detection period in the m detection periods, The second network device starts counting the number of packets received through the first communication link from the moment when it receives the link detection request message of the i-th detection period through the first communication link until the number of packets received through the first communication link Stop counting when the link detection request message of the i+1th detection cycle is received, and determine the number of received packets counted as the second network device passing through the first communication link within the i-th detection cycle The number of packets received by the path; for each detection period in the m detection periods, the second network device can determine the second network device in each detection period in the same way as the i-th detection period The number of packets received through the first communication link, and then, the second network device may, according to the number of packets received by the second network device through the first communication link in each of the m detection cycles, Determine the number of packets received by the second network device through the first communication link within the m detection periods. Wherein, the i-th detection period is any one of the m detection periods, 1≤i≤m, and i is an integer.

Optionally, the second network device may have a communication interface and a processor, and the processor may have a timing function and a counting function. For the i-th detection period, when the processor receives the link detection request message of the i-th detection period through the communication interface, the processor starts to count the i-th detection period when the second network device passes through the first The number of messages received by the communication link. When the processor receives the link detection request message of the i+1th detection cycle through the communication interface, the processor stops counting the second network device passing through the i-th detection cycle. The number of messages received by a communication link, the processor can compare the period of time (that is, the time when the link detection request message of the i+1 detection cycle is received with the time when the i-th detection cycle is received) The number of received data packets counted in the period between the moments of the link detection request message of the detection cycle) is determined as the second network device passing the first communication link in the i-th detection cycle The number of packets received. It should be noted that the number of packets received by the second network device through the first communication link during the ith detection period includes the number of packets received by the second network device through the first communication link during the ith detection period The number of link detection request packets and the number of data packets, excluding the number of link detection request packets of the i+1th detection cycle. It is easy to understand that the number of link detection request packets received by the second network device through the first communication link in each detection cycle is usually one.

For example, the number of packets received by the second network device through the first communication link within the i-th detection period may be S2_RC[i]. The number of packets received by the second network device through the first communication link within the m detection periods may be S2_RC[1~m], and S2_RC[1~m] includes S2_RC[m], S2_RC[m-1] , S2_RC[m-2], S2_RC[i]...S2_RC[1], S2_RC[m] indicates that the second network device passes the first The number of packets received by the communication link, S2_RC[m-1] indicates the number of packets received by the second network device through the first communication link in the m-1th detection cycle among the m detection cycles, in order By analogy, S2_RC[1] represents the number of packets received by the second network device through the first communication link in the first detection cycle among the m detection cycles.

After the second network device determines the number of packets S2_RC[1~m] received by the second network device through the first communication link within the m detection periods, it may The number of packets S2_RC[1~m] received through the first communication link and the number of packets S1_SC[1~m] sent by the first network device through the first communication link within the m detection periods obtained from the analysis in step 203 m] to determine the first unidirectional packet loss amount of the first communication link. For example, the first unidirectional packet loss amount may be ΔRS1=S2_RC[1~m]-S1_SC[1~m]=(S2_RC[1]-S1_SC[1])+(S2_RC[2]-S1_SC[ 2])+...+(S2_RC[m-2]-S1_SC[m-2])+(S2_RC[m-1]-S1_SC[m-1])+(S2_RC[m]-S1_SC[m] ). The first unidirectional packet loss amount refers to the packet loss amount of the first communication link in a first direction, and the first direction refers to a direction from the first network device to the second network device.

Step 205, the second network device determines the number of packets sent by the second network device through the first communication link within the m detection periods in the nth detection period.

Wherein, the number of packets sent by the second network device through the first communication link within the m detection periods may include: datagrams sent by the second network device through the first communication link within the m detection periods The number of messages and the number of link detection response messages. Since the first communication link is a communication link between the first network device and the second network device, it is easy to understand that the data packet and the link detection response message sent by the second network device through the first communication link The receiving ends are all first network devices. After the first network device sends a link detection request message to the second network device through the first communication link, the second network device may send a link detection response message to the first network device through the first communication link. Wherein, the link detection response message may be sent immediately after the second network device receives the link detection request message, and the sending time of the link detection response message may be the same as the receiving time of the link detection request message. Neighboring two moments.

In this embodiment of the application, the link detection response message may be a spontaneous message sent by the second network device, and the spontaneous message refers to a message generated and sent by the second network device to respond to the link detection request message The data message sent by the second network device refers to a message generated by the host and forwarded by the second network device, and the data message is used for communication between hosts. Since the link detection response message can be a spontaneous message of the second network device, the sending interval (that is, the detection cycle) of the link detection response message can be configured according to actual needs. In this way, the communication link can be improved. Detection flexibility, precision and sensitivity. Exemplarily, the detection period may be 100 milliseconds. It is easy to understand that the detection period of 100 milliseconds is only exemplary. In practical applications, the detection period can be flexibly configured, and the detection period can be less than 100 milliseconds or greater than 100 milliseconds.

Optionally, the second network device determining the number of packets sent by the second network device through the first communication link within the m detection periods may include: for the i-th detection period in the m detection periods, The second network device starts counting the number of packets sent through the first communication link from the moment when the link detection response packet of the i-th detection period is sent through the first communication link until the number of packets sent through the first communication link Stop counting at the moment of the link detection response message in the i+1 detection cycle, and determine the number of packets sent that have been counted as being sent by the second network device through the first communication link in the i-th detection cycle number of packets; for each detection cycle in the m detection cycles, the second network device can determine that the second network device passes the first detection cycle in each detection cycle in the same manner as the i-th detection cycle The number of packets sent by a communication link, and then, the second network device can determine the second network device according to the number of packets sent by the second network device through the first communication link in each of the m detection cycles. The number of packets sent by the second network device through the first communication link within the m detection periods. Wherein, the i-th detection period is any one of the m detection periods, 1≤i≤m, and i is an integer.

Optionally, the second network device may have a communication interface and a processor, and the processor may have a timing function and a counting function. For the i-th detection cycle, when the processor receives the link detection request message of the i-th detection cycle through the communication interface, the processor triggers the communication interface to send the i-th detection cycle through the first communication link Periodic link detection response message, and the processor starts to count the number of messages sent by the second network device through the first communication link in the i-th detection cycle at the same time, when the processor receives the i+1th message through the communication interface When the link detection request message of the detection cycle is detected, the processor triggers the communication interface to send the link detection response message of the i+1 detection cycle through the first communication link, and at the same time, the processor stops counting the i-th The number of packets sent by the second network device in the detection cycle through the first communication link, and the processor can compare the time period (that is, the time when the link detection response message of the i+1th detection cycle is sent) with The time period between the moments when the link detection response message of the i-th detection period is sent) is determined as the second network device passing the first Number of telegrams sent on the communication link. It should be noted that the number of packets sent by the second network device through the first communication link during the ith detection period includes the number of packets sent by the second network device through the first communication link during the ith detection period The number of link detection response packets and the number of data packets, excluding the number of link detection response packets in the i+1th detection cycle. It is easy to understand that the number of link detection response packets sent by the second network device through the first communication link in each detection period is usually one.

For example, the number of packets sent by the second network device through the first communication link in the i-th detection period may be S2_SC[i]. The number of messages sent by the second network device through the first communication link within the m detection periods may be S2_SC[1~m], and S2_SC[1~m] includes S2_SC[m], S2_SC[m-1] , S2_SC[m-2], S2_SC[i]...S2_SC[1], S2_SC[m] indicates that the second network device passes the first The number of packets sent by the communication link, S2_SC[m-1] indicates the number of packets sent by the second network device through the first communication link in the m-1th detection cycle among the m detection cycles, in order By analogy, S2_SC[1] represents the number of packets sent by the second network device through the first communication link in the first detection cycle among the m detection cycles.

Step 206, the second network device sends a first link detection response message to the first network device through the first communication link according to the first link detection request message in the nth detection cycle, and the first link detection The response message includes the number of messages received and the number of messages sent by the second network device through the first communication link within the m detection periods.

After receiving the first link detection request message, the second network device may send the first link detection response message to the first network device through the first communication link according to the first link detection request message. The sending of the first link detection response message may be performed immediately after receiving the first link detection request message, of course, it may not be performed immediately, which is not limited in this embodiment of the present application.

Optionally, the second network device may first generate the first link detection response message, and then send the first link detection response message to the first network device through the first communication link. Wherein, the first link detection response message may include the number of messages received and the number of messages sent by the second network device through the first communication link within the m detection periods. Exemplarily, the first link detection response message includes S2_RC[1~m] and S2_SC[1~m].

The description of the information contained in the first link detection response packet in this embodiment of the present application is only exemplary, and those skilled in the art should understand that the first link detection response packet may also include other information, for example, the first The link detection response message may also include the type (request type or response type) of the first link detection response message, the serial number of the first link detection response message, and the sending time of the first link detection request message Stamp S1_STn, the receiving timestamp S2_RTn of the first link detection request message and the sending timestamp S2_STn of the first link detection response message, S1_STn indicates that the first network device passes the first communication link in the nth detection cycle The time stamp of sending the link detection request message, S2_RTn indicates the time stamp of the second network device receiving the link detection request message through the first communication link in the nth detection period, and S2_STn indicates that the second network device receives the link detection request message at the nth detection cycle The time stamp of the link detection response message sent through the first communication link within a detection period.

Step 207, the first network device receives the first link detection response message sent by the second network device through the first communication link in the nth detection period.

After receiving the first link detection response message, the first network device may parse the first link detection response message to obtain the messages received by the second network device through the first communication link within the m detection periods number, and the number of packets sent by the second network device through the first communication link within the m detection periods. Wherein, the number of packets received by the second network device through the first communication link during the m detection periods may be S2_RC[1~m], and the second network device passes the first communication link within the m detection periods The number of packets sent by the link can be S2_SC[1~m]. It is easy to understand that the first network device can also obtain the type of the first link detection response message, the serial number of the first link detection response message, and the first link detection request message by analyzing the first link detection response message. information such as the sending time stamp S1_STn of the first link detection request message, the receiving time stamp S2_RTn of the first link detection request message, and the sending time stamp S2_STn of the first link detection response message.

Optionally, the first network device may determine the receiving timestamp S1_RTn of the first link detection response message, and when the first link detection response message further includes the sending timestamp S2_STn of the first link detection response message, The first network device may determine the second one-way delay of the first communication link according to the sending timestamp S2_STn of the first link detection response packet and the receiving timestamp S1_RTn of the first link detection response packet. Exemplarily, the second one-way time delay may be ΔTn2=S1_RTn-S2_STn, S1_RTn represents the time stamp when the first network device receives the link detection response message through the first communication link in the nth detection period, ΔTn2 Tn2 represents the second one-way delay of the first communication link in the nth detection cycle, the second one-way delay refers to the delay of the first communication link in the second direction, and the second direction refers to is the direction from the second network device to the first network device.

Optionally, the first network device may determine the receiving time stamp S1_RTn of the first link detection response message, when the first link detection response message also includes the sending time stamp S1_STn, the first link detection request message When receiving the time stamp S2_RTn of a link detection request message and the sending time stamp S2_STn of the first link detection response message, the first network device may according to the receiving time stamp S1_RTn of the first link detection response message, the first The sending timestamp S2_STn of the link detection response message, the receiving timestamp S2_RTn of the first link detection request message, and the sending timestamp S1_STn of the first link detection request message determine the two-way delay of the first communication link . Exemplarily, the two-way time delay may be ΔTn=(S1_RTn-S2_STn)+(S2_RTn-S1_STn).

Step 208 , the first network device determines the number of packets received by the first network device through the first communication link within the m detection cycles in the nth detection cycle.

Wherein, the number of packets received by the first network device through the first communication link within the m detection periods may include: datagrams received by the first network device through the first communication link within the m detection periods The number of messages and the number of link detection response messages. Since the first communication link is a communication link between the first network device and the second network device, it is easy to understand that the data packet and the link detection response message received by the first network device through the first communication link The sending ends are all second network devices. As described in step 202, the link detection response packet may be a spontaneous packet of the second network device.

Optionally, the first network device determining the number of packets received by the first network device through the first communication link within the m detection periods may include: for the i-th detection period in the m detection periods, The first network device starts counting the number of packets received through the first communication link from the moment when it receives the link detection response message of the i-th detection period through the first communication link until the number of packets received through the first communication link Stop counting when the link detection response message of the i+1th detection cycle is received, and determine the number of received packets counted as the first network device passing the first communication link within the i-th detection cycle The number of packets received by the path; for each detection period in the m detection periods, the first network device can determine that the first network device is within each detection period in the same manner as the i-th detection period The number of packets received through the first communication link. Afterwards, the first network device may, according to the number of packets received by the first network device through the first communication link in each of the m detection cycles, Determine the number of packets received by the first network device through the first communication link within the m detection periods. Wherein, the i-th detection period is any one of the m detection periods, 1≤i≤m, and i is an integer.

Optionally, the first network device may have a communication interface and a processor, and the processor may have a timing function and a counting function. For the i-th detection period, when the processor receives the link detection response message of the i-th detection period through the communication interface, the processor starts to count The number of messages received by the communication link. When the processor receives the link detection response message of the i+1 detection cycle through the communication interface, the processor stops counting the first network device passing the first network device in the i-th detection cycle. The number of messages received by a communication link, the processor can compare the period of time (that is, the time when the link detection response message of the i+1 detection cycle is received with the time when the i-th detection cycle is received) The number of received data packets counted in the time period between the moments of the link detection response message in the detection cycle) is determined as the first network device passing the first communication link in the i-th detection cycle The number of packets received. It should be noted that the number of packets received by the first network device through the first communication link during the ith detection period includes The number of link detection response packets and the number of data packets, excluding the number of link detection response packets in the i+1th detection cycle. It is easy to understand that the number of link detection response packets received by the first network device through the first communication link in each detection cycle is usually one.

For example, the number of packets received by the first network device through the first communication link within the i-th detection period may be S1_RC[i]. The number of packets received by the first network device through the first communication link within the m detection periods may be S1_RC[1~m], and S1_RC[1~m] includes S1_RC[m], S1_RC[m-1] , S1_RC[m-2], S1_RC[i]...S1_RC[1], S1_RC[m] indicates that the first network device passes the first The number of packets received by the communication link, S1_RC[m-1] indicates the number of packets received by the first network device through the first communication link in the m-1th detection cycle among the m detection cycles, in order By analogy, S1_RC[1] represents the number of packets received by the first network device through the first communication link in the first detection cycle among the m detection cycles.

After the first network device determines the number of packets S1_RC[1~m] received by the first network device through the first communication link within the m detection periods, it may The number of packets S1_RC[1~m] received through the first communication link and the number of packets sent by the second network device through the first communication link within the m detection periods analyzed in step 207 may be S2_SC [1~m], determine the second unidirectional packet loss amount of the first communication link. For example, the second unidirectional packet loss amount may be ΔRS2=S1_RC[1~m]-S2_SC[1~m]=(S1_RC[1]-S2_SC[1])+(S1_RC[2]-S2_SC[ 2])+...+(S1_RC[m-2]-S2_SC[m-2])+(S1_RC[m-1]-S2_SC[m-1])+(S1_RC[m]-S2_SC[m] ). The second unidirectional packet loss amount refers to a packet loss amount of the first communication link in a second direction, and the second direction refers to a direction from the second network device to the first network device.

Step 209, the first network device according to the number of packets sent and received by the first network device through the first communication link within the m detection periods, and the second network device during the m detection periods The number of packets sent and received through the first communication link within a period determines the amount of packet loss of the first communication link, and the amount of packet loss is used to represent the network quality of the first communication link.

After the above step 201, step 207 and step 208, the first network device can obtain the number of packets S1_SC[1~m] sent by the first network device through the first communication link within the m detection periods, the first The number of packets S1_RC[1~m] received by the network device through the first communication link within the m detection periods, and the number of packets sent by the second network device through the first communication link within the m detection periods The number S2_SC[1~m], and the number S2_RC[1~m] of packets received by the second network device through the first communication link within the m detection periods, therefore, the first network device can use the first The number of packets S1_SC[1~m] sent by the network device through the first communication link within the m detection periods, and the number of packets received by the first network device through the first communication link within the m detection periods The number S1_RC[1~m], the number of packets S2_SC[1~m] sent by the second network device through the first communication link within the m detection periods, and, the number of packets S2_SC[1~m] sent by the second network device during the m detection periods The number of packets S2_RC[1~m] received through the first communication link within a period determines the packet loss amount of the first communication link. The packet loss amount can be a two-way packet loss amount, and the packet loss amount is used to represent the second A network quality of a communication link. For example, the packet loss amount of the first communication link may be ΔRS=(S2_RC[1˜m]−S1_SC[1˜m])+(S1_RC[1˜m]−S2_SC[1˜m]).

Step 210, the first network device sends a second link detection request message to the second network device through the first communication link in the n+1 detection cycle, the second link detection request message includes the first network device The number of packets received through the first communication link within the m detection periods.

In this embodiment of the present application, the first network device may send the second link detection request message to the second network device through the first communication link when the start moment of the n+1th detection period arrives.

Optionally, when the start moment of the n+1th detection period arrives, the first network device may first generate a second link detection request message, and then send the second link detection request message to the second network device through the first communication link. Link detection request message. Wherein, the second link detection request message includes the number of messages received by the first network device through the first communication link within the m detection periods. Exemplarily, the second link detection request message includes S1_RC[1~m].

The description of the information contained in the second link detection request message in this embodiment of the present application is only exemplary, and those skilled in the art should understand that the second link detection request message may also include other information, for example, the second The link detection request message can also include the type (request type or response type) of the second link detection request message, the serial number of the second link detection request message, and the sending time of the second link detection request message Stamp, the number of packets received by the first network device through the first communication link in the m detection cycles before the n+1th detection cycle, the two-way delay calculated by the first network device, etc., this embodiment of the present application No limit.

Step 211 , the second network device receives the second link detection request message sent by the first network device through the first communication link in the n+1th detection period.

After receiving the second link detection request message, the second network device may parse the second link detection request message to obtain the messages received by the first network device through the first communication link within the m detection periods The number of packets received by the first network device through the first communication link within the m detection periods may be S1_RC[1-m]. It is easy to understand that the second network device can also obtain information such as the sending time stamp of the second link detection request message and the two-way delay of the first communication link by parsing the second link detection request message. The first communication link may be calculated according to the sending timestamp of the first link detection request, the receiving timestamp of the first link detection request, the sending timestamp of the first link detection response, and the receiving timestamp of the first link detection response The two-way delay of the path is not limited in this embodiment of the present application.

Step 212, the second network device according to the number of packets sent and received by the first network device through the first communication link within the m detection periods, and the second network device detects The number of packets sent and received through the first communication link within a period determines the amount of packet loss of the first communication link, and the amount of packet loss is used to represent the network quality of the first communication link.

After the above steps 203-205 and step 211, the second network device can obtain the number of packets S1_SC[1-m] sent by the first network device through the first communication link within the m detection periods, the first The number of packets S1_RC[1~m] received by the network device through the first communication link within the m detection periods, and the number of packets sent by the second network device through the first communication link within the m detection periods The number S2_SC[1~m], and the number S2_RC[1~m] of packets received by the second network device through the first communication link within the m detection periods, therefore, the second network device can A packet loss amount of the first communication link is determined, and the packet loss amount may be a two-way packet loss amount. For the process of the second network device determining the packet loss amount of the first communication link, reference may be made to step 209, which will not be described again in this embodiment of the present application.

In this embodiment of the application, the number of packets sent and the number of packets received by the network equipment include the number of data packets and link detection packets (including link detection request packets and link detection response packets). ), in this way, it is determined that the network quality of the communication link is closer to the network quality of the communication link actually used by the host, so the solution detection provided by the embodiment of the present application has higher reliability. In addition, link detection packets exchanged between network devices can carry the last m times (m detection cycles) packet statistics results, so that when a link detection packet is lost, the network device can The statistical result carried in the link detection message subsequent to the certain link detection message restores the lost link detection message, further improving the reliability of detection.

There may be at least two communication links between the first network device and the second network device in this application, and each communication link may be detected according to the solution provided by the embodiment of this application, so that the at least two communication links may be connected according to the detection results. switch traffic. For example, there may be a first communication link and a second communication link between the first network device and the second network device, and when it is detected that the network quality of the first communication link is poor according to the solution provided in this embodiment, The traffic between the first network device and the second network device can be switched to the second communication link, so as to realize intelligent route selection. Exemplarily, in this embodiment, the first network device may be network device 002 in the implementation environment shown in FIG. 1, the second network device may be network device 003 in the implementation environment shown in FIG. 1, and the first communication link It can be the communication link L23 in the implementation environment shown in FIG. 1, and the second communication link can be the communication link L213 in the implementation environment shown in FIG. 1. When the network quality of the communication link L23 is poor, the network can be connected to Traffic between device 002 and network device 003 is switched to communication link L213.

The order of the steps of the communication link detection method provided in the embodiment of the application can be adjusted appropriately, and the steps can also be increased or decreased according to the situation. Any person familiar with the technical field can easily think of changes within the technical scope disclosed in the application. Methods should be covered within the scope of protection of the present application, so they will not be repeated here.

To sum up, in the communication link detection method provided by the embodiment of the present application, the first network device sends the first link detection request message to the second network device through the first communication link in the nth detection period, and The first link detection response message sent by the second network device is received through the first communication link, and the first link detection response message includes that the second network device passes the first detection cycle in the m detection cycle before the nth detection cycle. The number of packets received and the number of packets sent by a communication link, and the first network device can determine the number of packets sent and received by the first network device through the first communication link within the m detection periods Afterwards, the first network device can send and receive packets according to the number of packets sent and received by the first network device through the first communication link within the m detection periods, and the number of packets received by the second network device during the m detection periods The packet loss amount of the first communication link is determined by the number of packets sent and received through the first communication link, and the packet loss amount is used to characterize the network quality of the first communication link. Therefore, the implementation of the present application The technical solution provided by the example can determine the network quality of the communication link. Further, since the link detection request message is a spontaneous message of the first network device, the first network device can flexibly configure the sending interval (that is, the detection period) of the link detection request message, compared to IP FPM technology, the solutions provided in the embodiments of the present application can improve the flexibility, precision and sensitivity of detection.

The method for detecting a communication link provided in the embodiment of the present application will be described below by using an example with reference to FIG. 3 .

Please refer to FIG. 3 , which shows a schematic diagram of a method for detecting a communication link provided by an embodiment of the present application. In Figure 3, T1~T(n+1) represent n+1 detection cycles, each point in P1~P24 corresponds to a moment (or called a time stamp), and the KA req message is a link detection request message, and the KA Ack message is a link detection response message. Wherein, the time corresponding to the P1 point can be the starting time of the detection cycle T1, the time corresponding to the P5 point can be the starting time of the detection cycle T2 (or the end time of the detection cycle T1), and the time corresponding to the P9 point can be the detection cycle The start time of T3 (or the end time of the detection cycle T2), and so on, the time corresponding to the point P13 can be the start time of the detection cycle Tm (or the end time of the detection cycle T(m-1)), and the point P17 The corresponding moment can be the starting moment of the detection period Tn (or the end moment of the detection period Tm), and the corresponding moment of P21 point can be the starting moment of the detection period T(n+1) (or the end of the detection period Tn time). In this embodiment of the present application, both the KA req message and the KA Ack message are transmitted through the first communication link as an example for illustration. See Figure 3:

At the time corresponding to point P1, the first network device sends KA req message 1 to the second network device through the first communication link. After sending KA req message 1, including KA req message 1, the first network device Start counting the number of packets sent by the first network device through the first communication link within the detection period T1 until the time corresponding to point P5. The number of packets sent by the link is determined as the number of packets S1_SC[1] sent by the first network device through the first communication link within the detection period T1. Wherein, the KA req message 1 includes the sequence number seq=1 of the KA req message 1 and the sending timestamp S1_ST1 of the KA req message 1 (that is, the time corresponding to point P1).

The second network device receives KA req message 1 at the time corresponding to point P2. After receiving KA req message 1, including KA req message 1, the second network device starts to count the second network in the detection period T1 The number of packets received by the device through the first communication link, until the time corresponding to point P6, the second network device stops counting, and determines the number of packets received through the first communication link counted during this period as the first The number of packets S2_RC[1] received by the second network device through the first communication link within the detection period T1. At the time corresponding to point P2, the second network device can determine the receiving time stamp S2_RT1 of KA req message 1 (that is, the time corresponding to point P2), because KA req message 1 includes the sending time stamp of KA req message 1 S1_ST1, therefore, at the time corresponding to point P2, the second network device determines the first one-way time of the first communication link according to the receiving time stamp S2_RT1 of KA req message 1 and the sending time stamp S1_ST1 of KA req message 1 Delay, the first one-way time delay may be ΔT11=S2_RT1-S1_ST1.

At the time corresponding to point P3, the second network device sends KA Ack message 1 to the first network device through the first communication link. After sending KA Ack message 1, including KA Ack message 1, the second network device Start counting the number of packets sent by the first network device through the first communication link within the detection period T1, until the time corresponding to point P7, the second network device stops counting, and counts the number of packets sent by the first communication link during this period The number of packets sent by the link is determined as the number of packets S2_SC[1] sent by the second network device through the first communication link within the detection period T1. Among them, the KA Ack message 1 includes the serial number seq=1 of the KA Ack message 1, the sending timestamp S1_ST1 of the KA req message 1 (that is, the time corresponding to the P1 point), and the receiving time of the KA req message 1 Stamp S2_RT1 and the sending timestamp S2_ST1 of KA Ack message 1 (that is, the time corresponding to point P3). The sending of the KA Ack message 1 may be performed immediately after the KA req message 1 is received.

The first network device receives the KA Ack message 1 at the time corresponding to point P4, and after receiving the KA Ack message 1, including the KA Ack message 1, the first network device starts to count the first network data within the detection period T1. The number of packets received by the device through the first communication link, until the time corresponding to point P8, the first network device stops counting, and determines the number of packets received through the first communication link counted during this period as the first The number of packets S1_RC[1] received by a network device through the first communication link within the detection period T1. At the time corresponding to point P4, the first network device can determine the receiving time stamp S1_RT1 of KA Ack message 1, since KA Ack message 1 includes the sending time stamp S2_ST1 of KA Ack message 1, therefore, at the time corresponding to point P4 , the first network device can determine the second one-way delay of the first communication link according to the receiving time stamp S1_RT1 of the KA Ack message 1 and the sending time stamp S2_ST1 of the KA Ack message 1, and the second one-way time delay It can be ΔT12=S1_RT1-S2_ST1. In addition, since the KA Ack message 1 includes the sending timestamp S1_ST1 of the KA req message 1, the receiving timestamp S2_RT1 of the KAreq message 1, and the sending timestamp S2_ST1 of the KA Ack message 1, at the time corresponding to point P4, The first network device may receive the timestamp S1_RT1 of the KA Ack message 1, send the timestamp S2_ST1 of the KA Ack message 1, receive the timestamp S2_RT1 of the KA req message 1, and send the timestamp S1_ST1 of the KA req message 1, The two-way time delay of the first communication link is determined, and the two-way time delay may be ΔT1=(S1_RT1-S2_ST1)+(S2_RT1-S1_ST1).

At the time corresponding to point P5, the first network device sends KA req message 2 to the second network device through the first communication link. After sending KA req message 2, including KA req message 2, the first network device Start counting the number of packets sent by the first network device through the first communication link within the detection period T2, until the time corresponding to point P9, the first network device stops counting, and counts the number of packets sent by the first communication link during this period The number of packets sent by the link is determined as the number of packets S1_SC[2] sent by the first network device through the first communication link within the detection period T2. Wherein, the KA req message 2 includes the sequence number seq=2 of the KA req message 2, the sending timestamp S1_ST2 of the KA req message 2 (that is, the time corresponding to the P5 point) and the first network device's detection period T1 The number of messages S1_SC[1] sent through the first communication link in the first communication link. At this time, because the corresponding time of P6 point, P7 point and P8 point has not yet arrived, S2_RC[1], S2_SC[1] and S1_RC[1] ] are all 0.

The second network device receives the KA req message 2 at point P6, and after receiving the KA req message 2, the second network device can obtain S2_RC[1]. At the same time, after receiving the KA req message 2, including the KA req message 2, the second network device starts to count the number of messages received by the second network device through the first communication link within the detection period T2 until point P10 At the corresponding moment, the second network device stops counting, and determines the number of packets received through the first communication link counted during this period as the number of packets received by the second network device through the first communication link within the detection period T2. The number of telegrams S2_RC[2].

The second network device sends a KA Ack message 2 to the first network device through the first communication link at the time corresponding to point P7, and after sending the KA Ack message 2, including the KA Ack message 2, the second network device Start counting the number of packets sent by the first network device through the first communication link within the detection period T2, until the time corresponding to point P11, the second network device stops counting, and counts the number of packets sent by the first communication link during this period The number of packets sent by the link is determined as the number of packets S2_SC[2] sent by the second network device through the first communication link within the detection period T2. Wherein, at the moment corresponding to point P7, the second network device can obtain S2_SC[1], and the KA Ack message 2 includes the serial number seq=2 of the KA Ack message 2, and the sending timestamp S1_ST2 of the KAreq message 2 (also That is, the time corresponding to point P5), the receiving time stamp S2_RT2 of KA req message 2 (that is, the time corresponding to point P6), the sending time stamp S2_ST2 of KA req message 2 (that is, the time corresponding to point P7) , the number of packets S1_SC[1] sent by the first network device through the first communication link within the detection period T1, the number of packets S2_RC[1] received by the second network device through the first communication link within the detection period T1 , and, the number of packets S2_SC[1] sent by the second network device through the first communication link within the detection period T1. The sending of the KA Ack message 2 may be performed immediately after the KA req message 2 is received.

The first network device receives the KA Ack message 2 at the time corresponding to point P8, and after receiving the KA Ack message 2, including the KA Ack message 2, the first network device starts to count the first network data within the detection period T2. The number of packets received by the device through the first communication link, until the time corresponding to point P12, the first network device stops counting, and determines the number of packets received through the first communication link counted during this period as the first The number of packets S1_RC[2] received by a network device through the first communication link within the detection period T1. Wherein, at the moment corresponding to point P8, the first network device can determine the number of packets S1_RC[1] received by the first network device through the first communication link within the detection period T1, since the KA Ack message 2 includes the first The number of packets S1_SC[1] sent by the network device through the first communication link within the detection period T1, the number of packets S2_RC[1] received by the second network device through the first communication link within the detection period T1, and, The number of packets S2_SC[1] sent by the second network device through the first communication link within the detection period T1, therefore, at the time corresponding to point P8, the first network device can determine the packet loss amount of the first communication link, The packet loss amount may be (S2_RC[1]˜S1_SC[1])+(S1_RC[1]˜S2_SC[1]).

At the time corresponding to point P9, the first network device sends a KA req message 3 to the second network device through the first communication link. After sending the KA req message 3, the first network device starts to count the first network data within the detection period T3. The number of packets sent by the device through the first communication link. The KA req message 3 may include the number of packets S1_RC[1] received by the first network device through the first communication link within the detection period T1, so that the second network device calculates the packet loss amount of the first communication link, or , KA req message 3 may include (S2_RC[1]˜S1_SC[1])+(S1_RC[1]˜S2_SC[1]), so that the calculation process of the second network device can be avoided.

The subsequent process can be analogized with reference to the above description, and will not be repeated here.

The following are device embodiments of the present application, which can be used to implement the method embodiments of the present application. For details not disclosed in the device embodiments of the present application, please refer to the method embodiments of the present application.

Please refer to FIG. 4 , which shows a schematic diagram of a logical structure of a communication link detection device 400 provided in an embodiment of the present application. The communication link detection device 400 may be a first network device, or a functional components. Referring to FIG. 4 , the device 400 for detecting a communication link includes: a sending module 410 , a receiving module 420 , a first determining module 430 and a second determining module 440 . The sending module 410 is used to execute step 202 and step 210 in the embodiment shown in Figure 2; the receiving module 420 is used to execute step 207 in the embodiment shown in Figure 2; the first determination module 430 is used to execute the implementation shown in Figure 2 Step 201 and step 208 in the example; the second determining module 440 is used to execute step 209 in the embodiment shown in FIG. 2 .

In the embodiment of the present application, the first determination module 430 and the second determination module 440 may be the same determination module or different determination modules, and the first determination module 430 and the second determination module 440 may also be a processing module , the processing module executes steps such as determining in the above steps, which are not limited in this embodiment of the present application.

Please refer to FIG. 5 , which shows a schematic diagram of the logic structure of another communication link detection device 500 provided by the embodiment of the present application. The communication link detection device 500 can be the second network device, or the second network device functional components. Referring to FIG. 5 , the communication link detection device 500 includes: a first receiving module 510 , a sending module 520 , a second receiving module 530 , a first determining module 540 and a second determining module 550 . The first receiving module 510 is used to execute step 203 in the embodiment shown in Figure 2; the sending module 520 is used to execute step 206 in the embodiment shown in Figure 2; the second receiving module 530 is used to execute the embodiment shown in Figure 2 In step 211; the first determination module 540 is used to execute step 204 and step 205 in the embodiment shown in FIG. 2; the second determination module 550 is used to execute step 212 in the embodiment shown in FIG. 2.

In this embodiment of the application, the first receiving module 510 and the second receiving module 530 may be the same receiving module or different receiving modules, and the first receiving module 510, the sending module 520 and the second receiving module 530 may also be It is a transceiver module, which executes the steps of sending and receiving in the above steps; the first determining module 540 and the second determining module 550 can be the same determining module, or different determining modules, and the first determining module 540 and the second determination module 550 may also be a processing module, and the processing module performs steps such as determination in the above steps, which are not limited in this embodiment of the present application.

To sum up, in the communication link detection device provided in the embodiment of the present application, the first network device sends the first link detection request message to the second network device through the first communication link in the nth detection cycle, and The first link detection response message sent by the second network device is received through the first communication link, and the first link detection response message includes that the second network device passes the first detection cycle in the m detection cycle before the nth detection cycle. The number of packets received and the number of packets sent by a communication link, and the first network device can determine the number of packets sent and received by the first network device through the first communication link within the m detection periods Afterwards, the first network device can send and receive packets according to the number of packets sent and received by the first network device through the first communication link within the m detection periods, and the number of packets received by the second network device during the m detection periods The packet loss amount of the first communication link is determined by the number of packets sent and received through the first communication link, and the packet loss amount is used to characterize the network quality of the first communication link. Therefore, the implementation of the present application The technical solution provided by the example can determine the network quality of the communication link. Further, since the link detection request message is a spontaneous message sent by the first network device, the first network device can flexibly set the detection period. Compared with the IP FPM technology, the solution provided by the embodiment of the present application can improve the flexibility of detection performance, precision and sensitivity.

When the communication link detection device provided in the above-mentioned embodiment detects the communication link, it only uses the division of the above-mentioned functional modules as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional modules according to the needs. The internal structure is divided into different functional modules to complete all or part of the functions described above. In addition, the device for detecting a communication link provided in the above embodiment and the embodiment of the method for detecting a communication link belong to the same concept, and its specific implementation process is detailed in the method embodiment, and will not be repeated here.

Please refer to FIG. 6, which shows a schematic diagram of the hardware structure of a communication link detection device 600 provided by the embodiment of the present application. The communication link detection device 600 may be a network device, and the network device may be the above-mentioned embodiment. The first network device or the second network device. Referring to FIG. 6 , the communication link detection device 600 includes a processor 602 , a memory 604 , a communication interface 606 and a bus 608 , and the processor 602 , the memory 604 and the communication interface 606 are communicatively connected to each other through the bus 608 . Those skilled in the art should understand that the connection mode between the processor 602, the memory 604 and the communication interface 606 shown in FIG. They are communicatively connected to each other by means of connection other than the bus 608 .

Wherein, the memory 604 may be used to store instructions 6042 and data 6044 . In the embodiment of the present application, the memory 604 may be various types of storage media, such as random access memory (random access memory, RAM), read-only memory (read-only memory, ROM), non-volatile RAM (non-volatile RAM) -volatile RAM, NVRAM), programmable ROM (programmable ROM, PROM), erasable PROM (erasable PROM, EPROM), electrically erasable PROM (electrically erasable PROM, EEPROM), flash memory, optical memory and registers, etc.

Wherein, the processor 602 may be a general-purpose processor, and the general-purpose processor may be a processor that performs specific steps and/or operations by reading and executing instructions (such as instructions 6042) stored in a memory (such as the memory 604). The processor may use data (eg, data 6044 ) stored in a memory (eg, memory 604 ) during the process of performing the above steps and/or operations. A general processor may be, for example but not limited to, a central processing unit (central processing unit, CPU). In addition, the processor 602 may also be a special-purpose processor, which may be a processor specially designed to perform specific steps and/or operations, such as but not limited to, a digital signal processor ( digital signal processor (DSP), application-specific integrated circuit (application-specific integrated circuit, ASIC) and field-programmable gate array (field-programmable gate array, FPGA), etc. In addition, the processor 602 may also be a combination of multiple processors, such as a multi-core processor. The processor 602 may include at least one circuit to execute all or part of the steps of the method for detecting a communication link provided in the foregoing embodiments.

Among them, the communication interface 606 may include an input/output (input/output, I/O) interface, a physical interface and a logical interface, etc., which are used to realize the interconnection of devices inside the communication link detection device 600, and are used to realize the communication link. An interface for interconnecting the path detection apparatus 600 with other devices (such as network devices or hosts). The physical interface can be a gigabit Ethernet interface (gigabit Ethernet, GE), which can be used to interconnect the communication link detection device 600 with other devices (such as network equipment or hosts), and the logical interface is the communication link detection device 600 internal interface, which can be used to realize device interconnection inside the communication link detection device 600 . It is easy to understand that the communication interface 606 can be used for the communication link detection device 600 to communicate with other network devices and/or hosts, for example, the communication interface 606 is used for sending and receiving messages between the communication link detection device 600 and other network devices .

Wherein, the bus 608 may be any type of communication bus used to realize the interconnection of the processor 602 , the memory 604 and the communication interface 606 .

The above-mentioned devices may be respectively arranged on independent chips, or at least partly or all of them may be arranged on the same chip. Whether each device is independently arranged on different chips or integrated and arranged on one or more chips often depends on the needs of product design. The embodiments of the present application do not limit the specific implementation forms of the foregoing devices.

The device 600 for detecting a communication link shown in FIG. 6 is only exemplary. During implementation, the device 600 for detecting a communication link may also include other components, which will not be listed here. Wherein, the communication link detection apparatus 600 shown in FIG. 6 can determine the network quality of the communication link by executing all or part of the steps of the communication link detection method provided in the above embodiments.

An embodiment of the present application provides a communication link detection system, where the communication link detection system includes a first network device and a second network device. In a possible implementation, the first network device includes the communication link detection device 400 shown in FIG. 4, and the second network device includes the communication link detection device 500 shown in FIG. 5; in another possible implementation In the manner, at least one of the first network device and the second network device may be the communication link detection apparatus 600 shown in FIG. 6 .

An embodiment of the present application provides a computer-readable storage medium, and instructions are stored in the computer-readable storage medium, and when the instruction is run on a processing component of a computer, the processing component performs the communication provided by the embodiment shown in FIG. 2 All or part of the steps of the link method.

An embodiment of the present application provides a computer program product containing instructions, and when the computer program product is run on a computer, the computer is made to execute all or part of the steps of the communication link method provided by the embodiment shown in FIG. 2 .

An embodiment of the present application provides a chip, which includes a programmable logic circuit and/or program instructions, and is used to implement all or part of the steps of the communication link method provided by the embodiment shown in FIG. 2 when the chip is running.

It should be understood that the term "and/or" in this article is only an association relationship describing associated objects, which means that there may be three relationships, for example, A and/or B may mean: A exists alone, and A and B exist at the same time , there are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

It should be understood that, in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the order of execution, and the execution order of the processes should be determined by their functions and internal logic, and should not be used in the embodiments of the present application. The implementation process constitutes any limitation.

It should be understood that words such as "first" and "second" herein are only used for the purpose of distinguishing and describing, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order.

The serial numbers of the above embodiments of the present application are for description only, and do not represent the advantages and disadvantages of the embodiments.

The above descriptions are only optional embodiments of the application, and are not intended to limit the application. Any modifications, equivalent replacements, improvements, etc. made within the principles of the application shall be included in the protection scope of the application. Inside.

Claims (14)

1. A method for detecting a communication link, used for a first network device in a communication network, the communication network comprising a second network device and the first network device, the first network device and the second network A first communication link is established between the devices, wherein the method includes: In the nth detection cycle, send a first link detection request message to the second network device through the first communication link, where n>1, and n is an integer; Receive the first link detection response message sent by the second network device for the first link detection request message through the first communication link, and the first link detection response message includes the The number of packets received by the second network device through the first communication link in the m detection periods before the nth detection period, and the number of packets received by the second network device in the m detection periods The number of messages sent by the first communication link, n>m≥1, and m is an integer; determining the number of packets sent by the first network device through the first communication link within the m detection periods, and the first network device through the first communication link within the m detection periods The number of messages received by the communication link; According to the number of packets sent by the first network device through the first communication link within the m detection periods, the second network device through the first communication link within the m detection periods The number of packets received by the channel, the number of packets sent by the second network device through the first communication link within the m detection periods, and the first network device during the m detection periods The packet loss amount of the first communication link is determined by the number of packets received through the first communication link, and the packet loss amount is used to characterize the network quality of the first communication link, wherein the The number of packets received by each network device of the first network device and the second network device through the first communication link within the m detection periods includes the number of packets received by each network device in the m The number of packets received through the first communication link in each of the m detection cycles, the number of packets sent by each network device through the first communication link in the m detection cycles The quantity includes the number of packets sent by each network device through the first communication link in each of the m detection periods. 2. The method according to claim 1, wherein the number of packets sent by the first network device through the first communication link within the m detection periods is determined, and the first The number of packets received by the network device through the first communication link within the m detection periods includes: For the i-th detection cycle in the m detection cycles, start counting the link detection request message passing through the first communication link from the moment when the link detection request message of the i-th detection cycle is sent through the first communication link The number of packets sent by the communication link until the moment when the link detection request packet of the i+1th detection cycle is sent through the first communication link is stopped, and the counted number of packets sent is determined as the first communication link The number of packets sent by a network device through the first communication link within the i-th detection cycle, the i-th detection cycle being any one of the m detection cycles, 1≤i ≤m, and i is an integer; According to the number of packets sent by the first network device through the first communication link in each of the m detection periods, determine that the first network device is within the m detection periods the number of packets sent through the first communication link; For the i-th detection cycle in the m detection cycles, start counting the first communication through the first communication link from the moment when the link detection response message of the i-th detection cycle is received through the first communication link The number of messages received by the link is stopped until the moment when the link detection response message of the i+1 detection period is received through the first communication link, and the counted number of received messages is determined as the The number of packets received by the first network device through the first communication link within the i-th detection period; According to the number of packets received by the first network device through the first communication link in each of the m detection periods, determine that the first network device is within the m detection periods The number of packets received through the first communication link. 3. The method according to claim 1 or 2, characterized in that, The number of packets sent by the first network device through the first communication link during the m detection periods includes: the number of packets sent by the first network device through the first communication link within the m detection periods The number of data packets sent by the link and the number of link detection request packets; The number of packets received by the first network device through the first communication link during the m detection periods includes: the number of packets received by the first network device through the first communication link within the m detection periods The number of data packets received by the link and the number of link detection response packets; The number of packets received by the second network device through the first communication link during the m detection periods includes: the number of packets received by the second network device through the first communication link within the m detection periods The number of data packets received by the link and the number of link detection request packets; The number of packets sent by the second network device through the first communication link during the m detection periods includes: the number of packets sent by the second network device through the first communication link within the m detection periods The number of data packets sent by the link and the number of link detection response packets. 4. A method for detecting a communication link, used for a second network device in a communication network, the communication network comprising a first network device and the second network device, the first network device and the second network A first communication link is established between the devices, wherein the method includes: In the nth detection period, receiving a first link detection request message sent by the first network device through the first communication link, the first link detection request message including the first link detection request message of the first network device The number of messages sent through the first communication link in the m detection cycles before the nth detection cycle, n>m≥1, and n and m are both integers; Sending a first link detection response message to the first network device through the first communication link according to the first link detection request message; In the n+1th detection period, receiving a second link detection request message sent by the first network device through the first communication link, the second link detection request message including the first The number of packets received by the network device through the first communication link within the m detection periods; determining the number of packets received by the second network device through the first communication link within the m detection periods, and the second network device through the first communication link within the m detection periods The number of messages sent by the communication link; According to the number of packets sent by the first network device through the first communication link within the m detection periods, the second network device through the first communication link within the m detection periods The number of packets received by the channel, the number of packets sent by the second network device through the first communication link within the m detection periods, and the first network device during the m detection periods The packet loss amount of the first communication link is determined by the number of packets received through the first communication link, and the packet loss amount is used to characterize the network quality of the first communication link, wherein the The number of packets received by each network device of the first network device and the second network device through the first communication link within the m detection periods includes the number of packets received by each network device in the m The number of packets received through the first communication link in each of the m detection cycles, the number of packets sent by each network device through the first communication link in the m detection cycles The quantity includes the number of packets sent by each network device through the first communication link in each of the m detection periods. 5. The method according to claim 4, wherein the number of packets received by the second network device through the first communication link within the m detection periods is determined, and the second The number of packets sent by the network device through the first communication link within the m detection periods includes: For the i-th detection cycle in the m detection cycles, start counting the first communication through the first communication link from the moment when the link detection request message of the i-th detection cycle is received through the first communication link The number of messages received by the link is stopped until the moment when the link detection request message of the i+1 detection period is received through the first communication link, and the counted number of received messages is determined as the The number of packets received by the second network device through the first communication link within the i-th detection cycle, the i-th detection cycle is any one of the m detection cycles, 1 ≤i≤m, and i is an integer; According to the number of packets received by the second network device through the first communication link in each of the m detection periods, determine that the second network device is within the m detection periods the number of messages received via the first communication link; For the i-th detection cycle in the m detection cycles, start counting the time when the link detection response message of the i-th detection cycle is sent through the first communication link through the first communication link The number of packets sent by the communication link until the moment when the link detection response packet of the i+1th detection period is sent through the first communication link is stopped, and the counted number of packets sent is determined as the first 2. The number of packets sent by the network device through the first communication link in the i-th detection period; According to the number of packets sent by the second network device through the first communication link in each of the m detection periods, determine that the second network device is within the m detection periods The number of packets sent through the first communication link. 6. The method according to claim 4 or 5, characterized in that, The number of packets sent by the first network device through the first communication link during the m detection periods includes: the number of packets sent by the first network device through the first communication link within the m detection periods The number of data packets sent by the link and the number of link detection request packets; The number of packets received by the first network device through the first communication link during the m detection periods includes: the number of packets received by the first network device through the first communication link within the m detection periods The number of data packets received by the link and the number of link detection response packets; The number of packets received by the second network device through the first communication link during the m detection periods includes: the number of packets received by the second network device through the first communication link within the m detection periods The number of data packets received by the link and the number of link detection request packets; The number of packets sent by the second network device through the first communication link during the m detection periods includes: the number of packets sent by the second network device through the first communication link within the m detection periods The number of data packets sent by the link and the number of link detection response packets. 7. A communication link detection device, used for a first network device in a communication network, the communication network includes a second network device and the first network device, the first network device and the second network A first communication link is established between the devices, wherein the device includes: A sending module, configured to send a first link detection request message to the second network device through the first communication link in the nth detection period, where n>1, and n is an integer; A receiving module, configured to receive, through the first communication link, a first link detection response message sent by the second network device in response to the first link detection request message, the first link detection response The packets include the number of packets received by the second network device through the first communication link in the m detection periods before the nth detection period, and the second network device receives the number of packets in the m detection period The number of messages sent through the first communication link in each detection cycle, n>m≥1, and m is an integer; A first determining module, configured to determine the number of packets sent by the first network device through the first communication link within the m detection periods, and the first network device transmits during the m detection periods the number of packets received through the first communication link within a period; The second determination module is configured to, according to the number of packets sent by the first network device through the first communication link within the m detection periods, the second network device within the m detection periods The number of packets received through the first communication link, the number of packets sent by the second network device through the first communication link within the m detection periods, and the first network device Determine the packet loss amount of the first communication link by the number of packets received through the first communication link within the m detection periods, and the packet loss amount is used to characterize the first communication link network quality, wherein, the number of packets received by each of the first network device and the second network device through the first communication link within the m detection periods includes each The number of packets received by a network device through the first communication link in each of the m detection cycles, and each network device passes through the first communication link in the m detection cycles The number of packets sent by the communication link includes the number of packets sent by each network device through the first communication link in each of the m detection cycles. 8. The device according to claim 7, wherein the first determination module is configured to: For the i-th detection cycle in the m detection cycles, start counting the link detection request message passing through the first communication link from the moment when the link detection request message of the i-th detection cycle is sent through the first communication link The number of packets sent by the communication link until the moment when the link detection request packet of the i+1th detection cycle is sent through the first communication link is stopped, and the counted number of packets sent is determined as the first communication link The number of packets sent by a network device through the first communication link within the i-th detection cycle, the i-th detection cycle being any one of the m detection cycles, 1≤i ≤m, and i is an integer; According to the number of packets sent by the first network device through the first communication link in each of the m detection periods, determine that the first network device is within the m detection periods the number of packets sent through the first communication link; For the i-th detection cycle in the m detection cycles, start counting the first communication through the first communication link from the moment when the link detection response message of the i-th detection cycle is received through the first communication link The number of messages received by the link is stopped until the moment when the link detection response message of the i+1 detection period is received through the first communication link, and the counted number of received messages is determined as the The number of packets received by the first network device through the first communication link within the i-th detection period; According to the number of packets received by the first network device through the first communication link in each of the m detection periods, determine that the first network device is within the m detection periods The number of packets received through the first communication link. 9. Apparatus according to claim 7 or 8, characterized in that The number of packets sent by the first network device through the first communication link during the m detection periods includes: the number of packets sent by the first network device through the first communication link within the m detection periods The number of data packets sent by the link and the number of link detection request packets; The number of packets received by the first network device through the first communication link during the m detection periods includes: the number of packets received by the first network device through the first communication link within the m detection periods The number of data packets received by the link and the number of link detection response packets; The number of packets received by the second network device through the first communication link during the m detection periods includes: the number of packets received by the second network device through the first communication link within the m detection periods The number of data packets received by the link and the number of link detection request packets; The number of packets sent by the second network device through the first communication link during the m detection periods includes: the number of packets sent by the second network device through the first communication link within the m detection periods The number of data packets sent by the link and the number of link detection response packets. 10. An apparatus for detecting a communication link, used for a second network device in a communication network, the communication network comprising a first network device and the second network device, the first network device and the second network A first communication link is established between the devices, wherein the device includes: The first receiving module is configured to receive the first link detection request message sent by the first network device through the first communication link in the nth detection cycle, the first link detection request message Including the number of packets sent by the first network device through the first communication link in the m detection periods before the nth detection period, n>m≥1, and n and m are both integers; A sending module, configured to send a first link detection response message to the first network device through the first communication link according to the first link detection request message; The second receiving module is configured to receive the second link detection request message sent by the first network device through the first communication link in the n+1th detection cycle, and the second link detection request The packets include the number of packets received by the first network device through the first communication link within the m detection periods; A first determining module, configured to determine the number of packets received by the second network device through the first communication link within the m detection periods, and the second network device receives during the m detection periods The number of packets sent through the first communication link within a period; The second determination module is configured to, according to the number of packets sent by the first network device through the first communication link within the m detection periods, the second network device within the m detection periods The number of packets received through the first communication link, the number of packets sent by the second network device through the first communication link within the m detection periods, and the first network device Determine the packet loss amount of the first communication link by the number of packets received through the first communication link within the m detection periods, and the packet loss amount is used to characterize the first communication link network quality, wherein, the number of packets received by each of the first network device and the second network device through the first communication link within the m detection periods includes each The number of packets received by a network device through the first communication link in each of the m detection cycles, and each network device passes through the first communication link in the m detection cycles The number of packets sent by the communication link includes the number of packets sent by each network device through the first communication link in each of the m detection cycles. 11. The device according to claim 10, wherein the first determining module is configured to: For the i-th detection cycle in the m detection cycles, start counting the first communication through the first communication link from the moment when the link detection request message of the i-th detection cycle is received through the first communication link The number of messages received by the link is stopped until the moment when the link detection request message of the i+1 detection period is received through the first communication link, and the counted number of received messages is determined as the The number of packets received by the second network device through the first communication link within the i-th detection cycle, the i-th detection cycle is any one of the m detection cycles, 1 ≤i≤m, and i is an integer; According to the number of packets received by the second network device through the first communication link in each of the m detection periods, determine that the second network device is within the m detection periods the number of messages received via the first communication link; For the i-th detection cycle in the m detection cycles, start counting the time when the link detection response message of the i-th detection cycle is sent through the first communication link through the first communication link The number of packets sent by the communication link until the moment when the link detection response packet of the i+1th detection period is sent through the first communication link is stopped, and the counted number of packets sent is determined as the first 2. The number of packets sent by the network device through the first communication link in the i-th detection period; According to the number of packets sent by the second network device through the first communication link in each of the m detection periods, determine that the second network device is within the m detection periods The number of packets sent through the first communication link. 12. Apparatus according to claim 10 or 11, characterized in that, The number of packets sent by the first network device through the first communication link during the m detection periods includes: the number of packets sent by the first network device through the first communication link within the m detection periods The number of data packets sent by the link and the number of link detection request packets; The number of packets received by the first network device through the first communication link during the m detection periods includes: the number of packets received by the first network device through the first communication link within the m detection periods The number of data packets received by the link and the number of link detection response packets; The number of packets received by the second network device through the first communication link during the m detection periods includes: the number of packets received by the second network device through the first communication link within the m detection periods The number of data packets received by the link and the number of link detection request packets; The number of packets sent by the second network device through the first communication link during the m detection periods includes: the number of packets sent by the second network device through the first communication link within the m detection periods The number of data packets sent by the link and the number of link detection response packets. 13. A computer-readable storage medium, wherein instructions are stored in the computer-readable storage medium, and when the instructions are run on a processing component of a computer, the processing component executes claims 1 to 6 any one of the methods described. 14. A communication link detection system, characterized in that the communication link detection system comprises a first network device and a second network device, and the first network device comprises the device described in any one of claims 7 to 9. A communication link detection device, the second network device includes the communication link detection device according to any one of claims 10 to 12.

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