CN105765909A - Link switching method and device - Google Patents

Abstract

The present invention discloses a link switching method and device, the method comprising: a local bidirectional forwarding detection BFD node obtains the bit error rate of each link from a remote BFD node to the local BFD node; the local BFD node Selecting a link with a bit error rate lower than a set threshold as a working link; the local BFD node sends the identification of the working link to the remote BFD node, so that the remote BFD node will receive The link corresponding to the id is switched to the working link to solve the problem that the existing technology cannot detect the probabilistic packet loss failure, which causes the base station out of service and other problems.

Description

A link switching method and device

technical field

The present invention relates to the field of communication technologies, in particular to a link switching method and device.

Background technique

At present, the network carried by the all Internet Protocol (allInternetProtocol, allIP) is deployed, and the bidirectional forwarding detection (BidirectionalForwardingDetection, BFD) technology is usually used to detect link failures.

The BFD technology uses the receiving interval (RXInterval) to detect whether there is continuous packet loss in packets, so as to determine whether a link is faulty. BFD technology can implement link status detection. In the process of link status detection, usually only when three or more consecutive data packet errors or packet loss are detected, it will be determined that a link is faulty. Therefore, for Probabilistic packet loss caused by bit errors, because the number of probabilistic packet loss caused by bit errors cannot reach three consecutive ones, so the BFD technology cannot detect them. Probabilistic packet loss caused by bit errors is due to the fact that during signal transmission, decay changes the voltage of the signal, causing the signal to be damaged during transmission and resulting in bit errors, resulting in the loss of data packets. Probabilistic packet loss is generally caused by factors such as noise, pulses caused by alternating current or lightning, loose interfaces, optical port pollution, or sudden temperature rise. Probabilistic packet loss faults caused by these factors are likely to cause base station outages, etc. Serious Problem.

Contents of the invention

Embodiments of the present invention provide a link switching method and device, which are used to solve problems such as base station out of service caused by failure to detect probabilistic packet loss faults in the prior art.

In the first aspect, a link switching method is provided, including:

The local two-way forwarding detection BFD node obtains the bit error rate of each link from the remote BFD node to the local BFD node;

The local BFD node selects a link with a bit error rate lower than a set threshold as a working link;

The local BFD node sends the identifier of the working link to the remote BFD node, so that the remote BFD node switches the link corresponding to the received identifier as a working link.

With reference to the first aspect, in a first possible implementation manner, the local BFD node obtains the bit error rate of each link from the remote BFD node to the local BFD node, specifically including:

When there is at least one intermediate node between the local BFD node and the remote BFD node, the local BFD node obtains each link from the remote BFD node to the local BFD node through the following steps Bit error rate:

The local BFD node detects and obtains the first type of bit error rate of the link between the local and its adjacent intermediate nodes;

The local BFD node obtains the second type of bit error rate of the link from the neighbor node of the intermediate node to the intermediate node through the link control message sent by each intermediate node;

For each link, the local BFD node is based on the second type of bit error rate carried in the link control message sent by the intermediate node on the link, and the first type of bit error rate detected by the local node , to obtain the bit error rate of the link from the remote BFD node to the local BFD node.

With reference to the first aspect, in a second possible implementation manner, the local BFD node sends the identification of the working link to the remote BFD node, specifically including:

The local BFD node sends a link control message to the remote BFD node, and the link control message carries a link identifier and an extended error field, and the extended error field is used to indicate the The remote BFD node regards the link whose bit error rate is lower than the set threshold as the working link.

With reference to the second possible implementation of the first aspect, in a third possible implementation, the extended bit error field includes a bit error alarm type BERType field, a coefficient field, and a power exponent field, where the BERType uses To indicate whether the bit error rate exceeds a threshold, the coefficient field and the power exponent field together indicate the size of the bit error rate.

In combination with the first aspect, or in combination with any of the above possible implementations of the first aspect, in a fourth possible implementation, the local BFD node selects a link with a bit error rate lower than a set threshold as a working links, including:

When the local BFD node determines that there are multiple links with a bit error rate lower than the set threshold, the local BFD node selects the active link as the working link.

In a second aspect, a link switching device is provided, including:

An acquisition module, configured to acquire the bit error rate of each link from the remote bidirectional forwarding detection BFD node to the device;

A selection module, configured to select a link with a bit error rate lower than a set threshold as a working link;

A sending module, configured to send the identifier of the working link to the remote BFD node, so that the remote BFD node switches the link corresponding to the received identifier as a working link.

In combination with the second aspect, in a first possible implementation manner, the acquiring module is specifically used for:

When there is at least one intermediate node between the device and the remote BFD node, detect and obtain the first type of bit error rate of the link between the device and its adjacent intermediate node; send through each intermediate node link control message to obtain the second type of bit error rate of the link from the neighbor node of the intermediate node to the intermediate node; for each link, based on the link control message sent by the intermediate node on the link The second type of bit error rate carried in the text and the detected first type of bit error rate are used to obtain the bit error rate of the link from the remote BFD node to the local BFD node.

With reference to the second aspect, in a second possible implementation manner, the sending module is specifically configured to:

Sending a link control message to the remote BFD node, where the link control message carries a link identifier and an extended error field, and the extended error field is used to indicate that the remote BFD node will A link with a bit error rate lower than the set threshold is used as a working link.

With reference to the second possible implementation of the second aspect, in a third possible implementation, the sending module is further configured to carry an error alarm type BERType field, a coefficient field, and A power exponent field, wherein the BERType is used to indicate whether the bit error rate exceeds a threshold, and the coefficient field and the power exponent field together indicate the size of the bit error rate.

With reference to the second aspect, or any of the above-mentioned possible implementation manners of the second aspect, in a fourth possible implementation manner, the selection module is specifically configured to When there are multiple links, select the active link as the working link.

In a third aspect, a bidirectional forwarding detection BFD link detection device is provided, including a transceiver, a processor, and a memory, where the memory is used to store program codes, wherein:

The transceiver is used to obtain the bit error rate of each link from the remote BFD node to the device;

The processor is used to call the program code in the memory to perform the following operations:

Select the link whose bit error rate is lower than the set threshold as the working link;

The identifier of the working link is sent to the remote BFD node through the transceiver, so that the remote BFD node switches the link corresponding to the received identifier as a working link.

With reference to the third aspect, in a first possible implementation manner, the processor is specifically configured to:

When there is at least one intermediate node between the device and the remote BFD node, detect and obtain the first type of bit error rate of the link between the device and its adjacent intermediate node; receive through the transceiver A link control message sent by each intermediate node, and obtaining the second-type bit error rate of the link from the adjacent node of the intermediate node to the intermediate node from the link control message; for each link , based on the second type of bit error rate carried in the link control packet sent by the intermediate node on the link, and the detected first type of bit error rate, to obtain the link from the remote BFD node to the device BER.

With reference to the third aspect, in a second possible implementation manner, the transceiver is specifically used for:

Sending a link control message to the remote BFD node, where the link control message carries a link identifier and an extended error field, and the extended error field is used to indicate that the remote BFD node will A link with a bit error rate lower than the set threshold is used as a working link.

With reference to the second possible implementation of the third aspect, in a third possible implementation, the transceiver is further configured to:

The extended bit error field carries a bit error warning type BERType field, a coefficient field, and a power index field, wherein the BERType is used to indicate whether the bit error rate exceeds a threshold, and the coefficient field and the power index field together represent a bit error rate size.

With reference to the third aspect, or any of the above possible implementation manners of the third aspect, in a fourth possible implementation manner, the processor is specifically configured to When there are multiple links, select the active link as the working link.

In the embodiment of the present invention, the BFD error detection function is deployed for the BFD link detection device (including the local BFD node and the remote BFD node) to detect the bit error rate of the link from the local BFD node to the remote BFD node. It is necessary to use a link with a bit error rate lower than the set threshold as a working link, select a link with better performance, reduce the occurrence of probabilistic packet loss failures, and improve the efficiency of data transmission.

Description of drawings

FIG. 1 is a flowchart of a link switching method provided by an embodiment of the present invention;

Fig. 2 is a kind of link control message format that the embodiment of the present invention designs;

FIG. 3 is a schematic diagram of a link in a preferred embodiment 1 of the present invention;

Fig. 4 is a schematic diagram of bit error rate transfer in preferred embodiment 2 of the present invention;

Fig. 5 is a schematic diagram of bit error rate transfer in the third preferred embodiment of the present invention;

FIG. 6 is a schematic diagram of bit error rate transfer in preferred embodiment 4 of the present invention;

FIG. 7 is a schematic structural diagram of a link switching device provided by an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a BFD link detection device provided by an embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Embodiments of the present invention design a link switching method, as shown in Figure 1, the method includes the following steps:

Step 101: the local BFD node obtains the bit error rate of each link from the remote BFD node to the local BFD node.

The above bit error rate is an index to measure the accuracy of data transmission within a specified time, and can be used to measure the frequency of bit errors. Generally speaking, the bit error rate is calculated by the receiving node of the data through the following formula:

Bit error rate = N/M*100%, where N represents the bit errors transmitted within the specified time, and M represents the total number of codes transmitted within the specified time.

The link from the remote BFD node to the local BFD node generally includes a primary link and a standby link for transmitting data from the remote BFD node to the local BFD node, wherein the local BFD node is the receiving node.

In the embodiment of the present invention, a BFD node refers to a BFD link detection device, which may be a provider edge router (ProviderEdge, PE) or other device.

Step 102: The local BFD node selects a link with a bit error rate lower than a set threshold as a working link.

Preferably, the bit error threshold can be set in advance according to the upper limit of link connectivity in actual situations. When the bit errors of both the active link and the backup link are lower than the bit error threshold (that is, the set threshold), the active link is selected. The link is used as the working link, and the working link is used to send packets. When the bit errors of the active link and the backup link are higher than the bit error threshold, the local BFD node selects the link with a lower bit error rate according to the policy. road as a working link.

Step 103: The local BFD node sends the identifier of the working link to the remote BFD node, so that the remote BFD node switches the link corresponding to the received identifier to the working link.

Preferably, step 101 can be realized by but not limited to the following manner.

Mode 1: When there is no intermediate node between the local BFD node and the remote BFD node, the local BFD node detects and acquires the bit error rate of the link from the remote BFD node to the local BFD node.

Method 2: When there is at least one intermediate node between the local BFD node and the remote BFD node, the local BFD node detects and obtains the first type of BER of the link between the local and its adjacent intermediate nodes. The local BFD node obtains the second-type BER of the link from the neighbor node of the intermediate node to the intermediate node through the link control message sent by each intermediate node. For each link, the local BFD node obtains the information from the remote node based on the Type 2 BER carried in the link control packet sent by the intermediate node on the link and the Type 1 BER detected by the local node. Bit error rate of the link from the end BFD node to the local BFD node.

For example, the local BFD node is node 1, the remote BFD node is node N, there are several intermediate nodes between node 1 and node N, and N is a positive integer greater than 2.

Assume that node 1 detects that the first type of bit error rate of the link from node 2 to node 1 is X ₁ , and node 2 detects that the second type of bit error rate of the link from node 3 to node 2 is X ₂ , Node N-1 detects that the second type of bit error rate of the link from node N to node N-1 is X _N-1 , then the bit error rate from node N to node 1 is (1-X ₁ )*( 1-X ₂ )*(1-X _N-1 ).

For another example, the average value of X ₁ X ₂ . . . X _N-1 may be used as the bit error rate from node N to node 1.

The aforementioned local BFD node or intermediate node may use multiple detection methods to detect the bit error rate of the link, for example, a cyclic redundancy check code (Cyclic Redundancy Check, CRC) manner. The local BFD node or intermediate node checks whether the received data is correct, and obtains the bit error rate of the link accordingly.

Preferably, step 103 can be implemented in the following manner:

The local BFD node sends a link control message to the remote BFD node. The link control message carries the link identifier and the extended bit error field to instruct the remote BFD node to lower the bit error rate below the set threshold. link as the working link.

The extended bit error field includes bit error alarm type (BitErrorRateType, BERType) field, coefficient field Coefficient and power exponent field Power, where BERType is used to represent whether the bit error rate exceeds the set threshold, or indicates whether the bit error rate has recovered to Below the set threshold, Coefficient and Power together indicate the size of the bit error rate to support the delivery of bit error detection results.

Preferably, when the local BFD node determines that there are multiple links with bit error rates lower than the set threshold, the local BFD node uses the active link as the working link.

Preferably, the link control message in the embodiment of the present invention can adopt the format shown in FIG. 2 . In Figure 2, MyDiscriminator represents the local BFD node, and YourDiscriminator represents the remote BFD node. Compared with the BFD control message specified in the BFD protocol of RFC5880, the link control message designed in the embodiment of the present invention has more extended error code fields, which include BERType, Coefficient, Power and Reserved, where, When BERType is 1, it means that the bit error rate exceeds the set threshold, Coefficient means the coefficient of bit error rate, Power means the power/exponent of bit error rate, and Coefficient and Power indicate the size of bit error rate together to support the error detection result transfer.

A preferred embodiment 1 of the present invention will be described below with reference to FIG. 3 .

In FIG. 3, there is an intermediate node P between PE1 and PE2, and PE1 and PE2 are respectively connected to the intermediate node P through LSP links. PE1 and PE2 are directly connected to PE3 through the LSP link. PE1 and PE2 have the error detection function.

When PE1 detects the bit error rate of the LSP link with PE1 as the destination node, and determines that the bit error rate of a certain LSP link exceeds the set threshold, PE1 locally generates a link switching command, which carries the port index , bit error rate field, bit error notification message and other information, wherein the port index contains the port index information corresponding to the LSP link whose bit error rate exceeds the set threshold, and another LSP link whose bit error rate is lower than the set threshold The port index information corresponding to the path, the bit error rate field carries the size of the bit error rate exceeding the set threshold, and the bit error notification message is generated by the bit error.

PE1 executes link switching according to the link switching command generated locally, and switches the LSP link whose bit error rate is lower than the set threshold to the working link.

PE1 generates a link control packet and sends the link control packet to other nodes, notifying the other nodes to switch the LSP link whose bit error rate is lower than the set threshold to a working link.

For example, when PE1 detects that the bit error rate of the active link from PE2 to PE1 is higher than the set threshold and the bit error rate of the backup link is lower than the set threshold, it switches the backup link to the working link. And send a control link message to PE2 to notify PE2 to switch the standby link to a working link, and the control link message carries the identifier of the standby link.

For another example, when PE1 detects that the BER of the active link from PE3 to PE1 is lower than the set threshold, it selects the active link as the working link, and sends a control link packet to PE3, instructing PE3 to select The active link is used as the working link, and the control link message carries the identifier of the active link.

The second preferred embodiment of the present invention will be described below with reference to FIG. 4 .

In FIG. 4 , there is no intermediate node between PE1 and PE2, and the LSP link between PE1 and PE2 includes an active LSP link and a standby LSP link.

PE1 has the bit error detection function, and PE1 detects the bit error rate of the two LSP links from PE2 to PE1.

(1) Normally, PE1 and PE2 use the active LSP link to transmit service data as the working link. If PE1 detects that the bit error rate of the active LSP link is greater than the set threshold and the bit error rate of the backup LSP link is lower than the set threshold, it will switch the backup LSP link to the working link and generate a link control The link control packet is sent to PE2 to notify PE2 to switch the standby LSP link to the working link. The value of BERType in the link control packet is 1, indicating that the active LSP link is incorrect. When the bit rate exceeds the set threshold, Coefficient and Power together indicate the bit error rate of the active LSP link.

(2) When PE1 and PE2 use the backup LSP link as the working link, if PE1 detects that the bit error rate of the active LSP link drops below the set threshold or is equal to the set threshold, PE1 executes link recovery. switch, make the active LSP link the working link again, generate a link control packet, send the link control packet to PE2, and notify PE2 to execute the link switchback, and make the active LSP link the working link again. link, where the value of BERType in the link control message is 2, indicating that the bit error rate of the active LSP link has recovered to not exceed the set threshold, and Coefficient and Power together indicate the BER of the active LSP link BER, send the link control packet to PE2, informing PE2 to switch the standby LSP link to the working link.

The third preferred embodiment of the present invention will be described below with reference to FIG. 5 .

In Figure 5, there is an intermediate node P between PE1 and PE2.

The intermediate node P detects the bit error rate of the LSP link from PE2 to the intermediate node P, and transmits the bit error rate to PE1 through the link control message, wherein the extended bit error field of the link control message carries There is that bit error rate.

PE1 detects the bit error rate of the LSP link from the intermediate node P to PE1, and calculates the bit error rate of the LSP link from PE2 to PE1 based on the bit error rate transmitted by the intermediate node P and the bit error rate detected by PE1 . PE1 judges whether to perform link switching based on the bit error rate of the LSP link from PE2 to PE1. If the bit error rate of the active LSP link from PE2 to PE1 exceeds the set threshold, and there is an LSP link from PE2 to PE1 whose bit error rate is lower than the set threshold, set the bit error rate lower than the set threshold. The LSP link with the threshold value is set as the working link, and PE1 generates a link control packet to notify PE2 to perform link switching.

When PE1 determines that the bit error rate of the active LSP link from PE2 to PE1 has recovered to not exceed the set threshold, PE1 performs link switchback and switches the active LSP link from PE2 to PE1 to work again. link, and PE1 generates a link control packet to notify PE2 to perform link switchback.

A fourth preferred embodiment of the present invention will be described below with reference to FIG. 6 .

In Fig. 6, there are two intermediate nodes between PE1 and PE2, namely P1 and P2.

P2 detects the bit error rate (BER) of the LSP link from PE2 to P2 (assumed to be the P2 BER), and transmits the P2 BER to P1 through the link control packet, wherein the extended error rate of the link control packet The bit error rate of P2 is carried in the code field.

P1 detects the bit error rate of the LSP link from P2 to P1 (assumed to be the bit error rate of P1), and transmits the bit error rate of P1 to PE1 through the link control message, and forwards the link control message sent by P2 to PE1, thereby transmitting the P2 BER to PE1.

PE1 detects the BER of the LSP link from P1 to PE1 (assumed to be the BER of PE1), and calculates the BER of the LSP link from PE2 to PE1 based on the BER of P2, the BER of P1, and the BER of PE1. BER.

PE1 judges whether to perform link switching based on the bit error rate of the LSP link from PE2 to PE1. If the bit error rate of the active LSP link from PE2 to PE1 exceeds the set threshold, and there is an LSP link from PE2 to PE1 whose bit error rate is lower than the set threshold, set the bit error rate lower than the set threshold. The LSP link with the threshold value is set as the working link, and PE1 generates a link control packet to notify PE2 to perform link switching.

When PE1 determines that the bit error rate of the active LSP link from PE2 to PE1 has recovered to not exceed the set threshold, PE1 performs link switchback and switches the active LSP link from PE2 to PE1 to work again. link, and PE1 generates a link control packet to notify PE2 to perform link switchback.

Based on the same design idea, the embodiment of the present invention also provides a link switching device. Referring to Figure 7, the device includes:

An acquisition module 701, configured to acquire the bit error rate of each link from the remote BFD node to the device;

A selection module 702, configured to select a link with a bit error rate lower than a set threshold as a working link;

The sending module 703 is configured to send the identification of the working link to the remote BFD node, so that the remote BFD node switches the link corresponding to the received identification to a working link.

Preferably, the acquisition module 701 is specifically configured to, when at least one intermediate node exists between the present device and the remote BFD node, detect and obtain the first link between the present device and its adjacent intermediate node. class error rate; through the link control message sent by each intermediate node, obtain the second type bit error rate of the link from the adjacent node of the intermediate node to the intermediate node; for each link, based on the link The second type of bit error rate carried in the link control message sent by the intermediate node on the road, and the detected first type of bit error rate, to obtain the bit error rate of the link from the remote BFD node to the local BFD node .

Preferably, the above sending module 703 is specifically used for:

Send a link control message to the above-mentioned remote BFD node, the above-mentioned link control message carries the identification of the link and an extended bit error field, and the above-mentioned extended bit error field is used to indicate that the above-mentioned remote BFD node will lower the bit error rate The link above the set threshold is used as the working link.

Preferably, the above-mentioned sending module 703 is further configured to carry in the above-mentioned extended bit error field:

A BERType field, a coefficient field, and a power index field, wherein the above-mentioned BERType is used to indicate whether the bit error rate exceeds a threshold, and the above-mentioned coefficient field and the power index field together indicate the size of the bit error rate.

Preferably, the above selection module 702 is specifically used for:

When it is determined that there are multiple links with a bit error rate lower than the set threshold, the active link is selected as the working link.

The foregoing link switching device may be a device such as a provider edge router (ProviderEdge, PE).

An embodiment of the present invention provides a BFD link detection device, which includes: a transceiver 801, a processor 802, a memory 803, and a bus 804 as shown in FIG. And complete the mutual communication, among which:

The bus 804 may be an Industry Standard Architecture (Industry Standard Architecture, ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (Extended Industry Standard Architecture, EISA) bus, and the like. The bus 804 can be divided into address bus, data bus, control bus and so on. For ease of representation, only one line is used in FIG. 8 , but it does not mean that there is only one bus or one type of bus.

The memory 803 is used to store program codes including operation instructions. The memory 803 may include a high-speed random access memory (random access memory, RAM), and may also include a non-volatile memory (non-volatile memory), such as a disk memory.

The processor 802 may be a central processing unit (Central Processing Unit, CPU), or a specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.

The transceiver 801 is mainly used to implement the sending and receiving of communication data between the BFD link detection device in this embodiment and other BFD nodes.

Specifically, the transceiver 801 is configured to obtain the bit error rate of each link from the remote BFD node to the device.

The processor 802 is configured to call the program code in the memory 803 to perform the following operations:

Select the link whose bit error rate is lower than the set threshold as the working link;

The identifier of the working link is sent to the remote BFD node through the transceiver 801, so that the remote BFD node switches the link corresponding to the received identifier as a working link.

The transceiver 801 is also configured to send the identifier of the working link to the remote BFD node.

Preferably, the above-mentioned processor 802 is specifically configured to detect and obtain the first link between the current device and its adjacent intermediate node when there is at least one intermediate node between the current device and the remote BFD node. class error rate;

receiving the link control message sent by each intermediate node through the transceiver 801, and obtaining the second type of bit error rate of the link from the adjacent node of the intermediate node to the intermediate node from the link control message;

For each link, based on the second type of bit error rate carried in the link control message sent by the intermediate node on the link, and the detected first type of bit error rate, obtain the link from the remote BFD node to the local Bit error rate of the link of the device.

Preferably, the processor 802 carries the identification of the link and the extended bit error field in the link control message, and the extended bit error field is used to instruct the remote BFD node to lower the bit error rate below the set threshold. link as the working link.

Preferably, the above-mentioned processor 802 carries a BERType field, a coefficient field, and a power index field in the above-mentioned extended bit error field, wherein the above-mentioned BERType is used to indicate whether the bit error rate exceeds a threshold, and the above-mentioned coefficient field and the power index field together represent an error rate. The size of the code rate.

Preferably, the above-mentioned processor 802 is specifically used for:

When it is determined that there are multiple links with a bit error rate lower than the set threshold, the active link is selected as the working link.

In the embodiment of the present invention, the BFD error detection function is deployed for the BFD link detection device (including the local BFD node and the remote BFD node) to detect the bit error rate of the link from the local BFD node to the remote BFD node. It is necessary to use a link with a bit error rate lower than the set threshold as a working link, select a link with better performance, reduce the occurrence of probabilistic packet loss failures, and improve the efficiency of data transmission.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a Means for realizing the functions specified in one or more steps of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional changes and modifications can be made to these embodiments by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Apparently, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. In this way, if the modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (15)

1. a link switch-over method, it is characterised in that including:

Local two-way converting detection BFD node obtains the bit error rate from far-end BFD node to each of the links of described local BFD node；

Described local BFD node selects the bit error rate lower than the link setting threshold value, as active link；

Described local BFD node sends the mark of described active link to described far-end BFD node, so that the link switching of the mark correspondence received is active link by described far-end BFD node.

2. the method for claim 1, it is characterised in that described local BFD node obtains the bit error rate from far-end BFD node to each of the links of described local BFD node, specifically includes:

When there is at least one intermediate node between described local BFD node and described far-end BFD node, described local BFD node obtains the bit error rate from described far-end BFD node to each of the links of described local BFD node by following step:

Described local BFD nodal test also obtains the first kind bit error rate of local link between the intermediate node being adjacent；

Described local BFD node controls message, the Equations of The Second Kind bit error rate of the acquisition link from the neighbors of this intermediate node to this intermediate node by the link that each intermediate node sends；

For each link, described local BFD node controls the Equations of The Second Kind bit error rate carried on message based on the link that the intermediate node on this link sends, with the first kind bit error rate that described local node detects, acquisition is from far-end BFD node to the bit error rate of the link of local BFD node.

3. the method for claim 1, it is characterised in that described local BFD node sends the mark of described active link to described far-end BFD node, specifically includes:

Described local BFD node sends link to described far-end BFD node and controls message, described link controls to carry the mark of link and extension error code field in message, and described extension error code field is in order to indicate described far-end BFD node using the bit error rate lower than setting the link of threshold value as active link.

4. method as claimed in claim 3, it is characterized in that, described extension error code field includes error code alarm type BERType field, coefficient field and power exponent field, wherein, described BERType is in order to characterize whether the bit error rate exceedes threshold value, and described coefficient field represents the size of the bit error rate together with power exponent field.

5. the method as according to any one of claim 1-4, it is characterised in that described local BFD node selects the bit error rate lower than the link setting threshold value, as active link, specifically includes:

When described local BFD node determines the bit error rate lower than the link setting threshold value as multiple link, described local BFD node selection active link is as active link.

6. a link switching device, it is characterised in that including:

Acquisition module, detects the BFD node bit error rate to each of the links of this device for obtaining from far-end two-way converting；

Select module, for selecting the bit error rate lower than the link setting threshold value, as active link；

Sending module, for sending the mark of described active link, so that the link switching of the mark correspondence received is active link by described far-end BFD node to described far-end BFD node.

7. device as claimed in claim 6, it is characterised in that described acquisition module, specifically for:

When there is at least one intermediate node between this device and described far-end BFD node, detect and obtain this device first kind bit error rate to the link between the intermediate node being adjacent；The link sent by each intermediate node controls message, the Equations of The Second Kind bit error rate of the acquisition link from the neighbors of this intermediate node to this intermediate node；For each link, based on the Equations of The Second Kind bit error rate carried on the link control message that the intermediate node on this link sends, and the first kind bit error rate detected, obtain the bit error rate from far-end BFD node to the link of local BFD node.

8. device as claimed in claim 6, it is characterised in that described sending module, specifically for:

Send link to described far-end BFD node and control message, described link controls to carry the mark of link and extension error code field in message, and described extension error code field is in order to indicate described far-end BFD node using the bit error rate lower than setting the link of threshold value as active link.

9. device as claimed in claim 8, it is characterised in that described sending module, is further used for:

Carrying error code alarm type BERType field, coefficient field and power exponent field in described extension error code field, wherein, described BERType is in order to characterize whether the bit error rate exceedes threshold value, and described coefficient field represents the size of the bit error rate together with power exponent field.

10. the device as according to any one of claim 6-9, it is characterised in that described selection module, specifically for when determining the bit error rate lower than the link setting threshold value as multiple link, selecting active link as active link.

11. a two-way converting detection BFD link detecting equipment, it is characterised in that including transceiver, processor and memorizer, described memorizer is used for storing program code, wherein:

Described transceiver, for obtaining the bit error rate from far-end BFD node to each of the links of this equipment；

Described processor, for calling the program code in described memorizer, performs following operation:

Select the bit error rate lower than the link setting threshold value, as active link；

The mark of described active link is sent to described far-end BFD node, so that the link switching of the mark correspondence received is active link by this far-end BFD node by described transceiver.

12. BFD link detecting equipment as claimed in claim 11, it is characterised in that described processor, specifically for:

When there is at least one intermediate node between this equipment and described far-end BFD node, detect and obtain this equipment first kind bit error rate to the link between the intermediate node being adjacent；The link sent by each intermediate node of described transceivers controls message, and controls to obtain message the Equations of The Second Kind bit error rate of the link from the neighbors of this intermediate node to this intermediate node from described link；For each link, based on the Equations of The Second Kind bit error rate carried on the link control message that the intermediate node on this link sends, and the first kind bit error rate detected, obtain the bit error rate from far-end BFD node to the link of this equipment.

13. BFD link detecting equipment as claimed in claim 11, it is characterised in that described transceiver, specifically for:

Send link to described far-end BFD node and control message, described link controls to carry the mark of link and extension error code field in message, and described extension error code field is in order to indicate described far-end BFD node using the bit error rate lower than setting the link of threshold value as active link.

14. BFD link detecting equipment as claimed in claim 13, it is characterised in that described transceiver, it is further used for:

Carrying error code alarm type BERType field, coefficient field and power exponent field in described extension error code field, wherein, described BERType is in order to characterize whether the bit error rate exceedes threshold value, and described coefficient field represents the size of the bit error rate together with power exponent field.

15. the BFD link detecting equipment as according to any one of claim 11-14, it is characterised in that described processor, specifically for when determining the bit error rate lower than the link setting threshold value as multiple link, selecting active link as active link.