CN102136936B - Method, node and system for preventing control plane faults from influencing operation of forward data plane - Google Patents

Abstract

The present invention discloses a method, a node and a system for avoiding the failure of the control plane from affecting the operation of the forwarding plane. Send the cross-connection information to the head node of the LSP; receive a response message returned by the head node; if the response message indicates that the cross-connection of the LSP is inconsistent with the cross-connection of the LSP saved by the head node, delete the local The cross-connection of the LSP; otherwise, the cross-connection of the local LSP is reserved. Utilizing the present invention can prevent the normal business from being wrongly interrupted when the control plane information is inconsistent between network nodes, or when the information of the control plane and the forwarding plane inside the nodes are inconsistent.

Description

Method, node and system for preventing control plane failure from affecting forwarding plane operation

technical field

The invention relates to the field of communication technology, in particular to a method, a node and a system for preventing a control plane failure from affecting the operation of a forwarding plane.

Background technique

With the continuous advancement of hardware technology, the internal components of equipment in the field of data communication have differentiated into dedicated control modules and message forwarding modules. Among them, the control module is responsible for the operation of various routing, signaling, and management protocols, and is generally implemented by software for scalability; the message forwarding module is responsible for forwarding packet messages, and is generally implemented by hardware to ensure efficiency. Moreover, the control module and the message forwarding module can be completely replaced independently. In this case, it is generally required that the failure of the control module cannot affect the normal operation of the forwarding module.

At present, after the Resource Reservation Protocol (RSVP, Resource ReSer Vation Protocol) and its extended protocol are applied to the transmission field, the network model is clearly divided into independent control plane (Control Plane) and forwarding plane (Forward Data Plane), and even allow for separate deployments. In this case, the separation of control and forwarding is already a requirement that must be met, and the operator clearly requires that the failure of the control plane cannot affect the normal operation of the forwarding plane.

Each node in the network obtains the topology and service distribution information of the entire network through the interaction of routing and signaling protocols on the control plane, and the protocol interaction inevitably has a time delay. This delay causes control on each node. Inconsistencies in flat data. In a more serious situation, the control plane protocol on some nodes will fail, such as a control board reset. In the prior art, after the control plane of the faulty node resumes communication with the neighbor node, it will obtain information from the control plane of the neighbor node to restore its own control plane data, which will not only cause data inconsistency between the control plane and the forwarding plane inside the node. Moreover, if the control plane data cannot be guaranteed to be correct, updating the forwarding cross connection with the control plane data will result in wrong deletion of the forwarding plane cross connection and interrupt services that should not be interrupted.

Contents of the invention

Embodiments of the present invention provide a method, node and system for preventing control plane failures from affecting the operation of the forwarding plane, so as to avoid inconsistencies in the control plane information between network nodes, or when the internal control plane and forwarding plane information of the nodes are inconsistent, and the normal operation is interrupted by mistake. Business.

For this reason, the embodiment of the present invention provides following technical scheme:

A method for preventing a control plane failure from affecting forwarding plane operation, comprising:

After the control plane fails, when the node needs to delete the cross-connection of the LSP of the local forwarding plane, the information of the cross-connection is sent to the head node of the LSP;

Receive the response message returned by the first node;

If the response message indicates that the cross-connection of the LSP is inconsistent with the cross-connection of the LSP saved by the head node, then delete the cross-connection of the local LSP;

Otherwise, keep the cross-connection of the local LSP.

A node comprising:

The information sending unit is used to send the information of the cross-connection to the head node of the LSP when the node needs to delete the cross-connection of the LSP of the local forwarding plane after the failure of the control plane;

a response message receiving unit, configured to receive a response message returned by the first node;

A cross-connection information maintenance unit, configured to delete the cross-connection of the local LSP when the response message indicates that the cross-connection of the LSP is inconsistent with the cross-connection of the LSP saved by the head node; otherwise, retain the cross-connection of the local LSP .

A head node, including:

an information receiving unit, configured to receive cross-connect information sent by other nodes;

A judging unit, configured to determine the LSP corresponding to the cross-connection, and judge whether the received cross-connection is consistent with the cross-connection of the LSP saved by itself;

a response unit, configured to return a response message to the other node, and indicate in the response message whether the cross-connection is consistent with the cross-connection of the LSP saved by itself, so that the other node When indicating that the cross-connection of the LSP is inconsistent with the cross-connection of the LSP saved by the head node, delete the cross-connection of the local LSP; When the cross-connections of the LSPs are consistent, the cross-connections of the local LSPs are reserved.

A system for preventing control plane failure from affecting forwarding plane operation, including: a head node and other nodes connected through LSP;

The other nodes are used to send the information of the cross-connection to the head node of the LSP when the node needs to delete the cross-connection of the LSP of the local forwarding plane after a fault occurs in the control plane, and the When the returned response message indicates that the cross-connection of the LSP is inconsistent with the cross-connection of the LSP saved by the head node, delete the cross-connection of the local LSP;

The head node is configured to receive the cross-connection information sent by the other nodes, determine the LSP corresponding to the cross-connection, and judge whether the cross-connection is consistent with the cross-connection of the LSP saved by itself, and report to the other nodes The node returns a response message, and the response message indicates whether the cross-connection is consistent with the cross-connection of the LSP saved by itself.

In the embodiment of the present invention, the method, node and system for avoiding the failure of the control plane to affect the operation of the forwarding plane, after the failure of the control plane, when the node needs to delete the cross-connection of the LSP of the local forwarding plane, it does not directly delete, but first deletes the The cross-connection information is sent to the head node of the LSP, and whether to delete the cross-connection of the LSP is determined according to the confirmation result of the cross-connection by the head node. Since the cross-connection of the locally stored LSP of the head node is used as the confirmation standard, it is more reliable than the data of the upstream and downstream adjacent nodes, so it can not only avoid the inconsistency of control plane information between network nodes, but also avoid the internal control plane of the node. When the forwarding plane information is inconsistent, normal services are interrupted by mistake.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings that are required in the embodiments. Obviously, the accompanying drawings in the following description are only described in the present invention For some embodiments of the present invention, those skilled in the art can also obtain other drawings according to these drawings.

Fig. 1 is the flow chart of the method for avoiding the control plane failure from affecting the operation of the forwarding plane according to the embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a node provided by an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of another node provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of a network of a system that prevents a control plane failure from affecting forwarding plane operation according to an embodiment of the present invention;

Fig. 5 is a schematic diagram of an LSP in an embodiment of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below in conjunction with the drawings and implementations.

In the existing RSVP protocol and its extended protocol, under normal conditions, two adjacent nodes will continue to send Hello messages to notify each other that they are in a normal working state. When the control plane of a certain node fails, for example, the control board is reset, at this time, its adjacent nodes will detect the absence of the Hello message, thereby judging that the communication with the failed node is interrupted.

In this case, the Graceful Restart (GR, Graceful Restart) mechanism is usually used. The faulty node obtains the control plane information from the adjacent node through the control plane GR process between adjacent nodes, restores the control plane data of the node, and then follows the The control plane data of this node updates the local label switched path (LSP, label switched paths) cross information of the failed node.

GR is a mechanism designed to minimize the impact of restarting the main routing protocol and Multi-Protocol Label Switching (MPLS, Multi-Protocol Label Switching) signaling protocol. Its purpose is to minimize router restart or computing services that require rerouting The resulting routing jitter reduces the waste of routing computing resources and network bandwidth resources.

In the above cases, the adjacent nodes will enter the GR state and wait for the faulty node to resume the communication of the control plane within a period of time (called GR time). In the existing technology, there will be two situations in the follow-up:

(1) When the GR time ends and the adjacent node has not completed the communication with the control plane of the faulty node, the adjacent node will delete the LSP cross-connection reserved by itself.

(2) Before the GR time ends, the control plane of the adjacent node and the faulty node resumes communication. At this time, the faulty node exchanges information with the adjacent node, and restores the LSP cross-connection of its control plane. In general, the data on adjacent nodes can ensure that the failed node recovers to its pre-failure state. But there are also some special cases, the data on the adjacent node has changed, and the control plane LSP cross-connection restored by the faulty node from the adjacent node is inconsistent with the LSP cross-connection in the local forwarding table; the more special case is that the adjacent node There is also a fault in the control plane, and data cannot be provided to the faulty node at all to restore the LSP cross-connection of the control plane. At this time, the faulty node will use an arbitrary method to directly update the LSP cross-connection of the forwarding plane with its unreliable control plane data.

In the case of (1) above, the premise for the adjacent node to delete the LSP cross-connection reserved by itself is to assume that the control plane communication of the faulty node has not been restored, and its forwarding must be faulty, or regardless of whether its forwarding is faulty, All can not be maintained. But this assumption is problematic, because the forwarding plane of the faulty node may be normal, and the business is basically in normal use, but the control plane is faulty. Therefore, in this case, the adjacent node does not need to delete the LSP cross-connection reserved by itself.

In the above case (2), after the faulty node resumes communication, the control plane data obtained by the faulty node is not reliable. Therefore, in this case, the faulty node uses the unreliable control plane data to update the LSP crossover of the forwarding plane. When connecting, some LSP cross-connects may be deleted by mistake.

In the embodiment of the present invention, the method, node and system for avoiding the failure of the control plane from affecting the operation of the forwarding plane, in view of the above situations, when the control plane is abnormal and the LSP cross-connection needs to be deleted, the information of the LSP cross-connection to be deleted is sent to the head node Consistency confirmation is performed to avoid mistaken deletion of LSP cross-connects.

It should be noted that, in the embodiment of the present invention, the node refers to a network element with MPLS switching capability in the network, and the node includes control plane information and forwarding plane information. in:

Control plane information includes: Path Status Control Block (PSB, Path Status Control Block) and Reservation Status Control Block (RSB, ReSerVation Status Control Block). On the node, each LSP maintains a PSB and an RSB, recording the network level information of an LSP, mainly including:

A. The source and sink node identifiers of the LSP, the index number of the LSP on the source node, and the instance number, these information can uniquely identify an LSP in the network.

B. Parameters such as LSP preemption priority, bandwidth, routing constraints, path records, upstream and downstream label values, etc., these parameters play a key role in the packet forwarding behavior.

The forwarding plane information includes a cross-connect, and each LSP has a corresponding cross-connect. Cross-connection is the basis for message forwarding, and its content includes: incoming interface, incoming label, outgoing interface, outgoing label, priority, bandwidth and other parameters.

It can be seen that the control plane information is network-level information, which describes the network-level characteristics of the LSP, and the forwarding plane information is node-level information, which describes the forwarding behavior of the LSP on the local node.

As shown in Figure 1, it is a flow chart of the method for avoiding the control plane failure from affecting the operation of the forwarding plane according to the embodiment of the present invention, including the following steps:

Step 101 , when the node needs to delete the cross-connection of the LSP of the local forwarding plane after the failure of the control plane, send the information of the cross-connection to the head node of the LSP.

The cross-connect information mainly includes information at the network level, such as: head node, end node, LSP index, LSP instance, and the like. For a given LSP, the information is the same on all the nodes it passes through.

Step 102, receiving a response message returned by the head node.

After receiving the cross-connection information, the head node determines the LSP corresponding to the cross-connection, then judges whether the cross-connection is consistent with the cross-connection of the LSP saved by the head node, and returns the judgment result to the Describe this node. For example, indication information for indicating whether the cross-connection is consistent with the cross-connection of the LSP saved by the head node may be carried in the response message.

It should be noted that after the first node receives the cross-connection information, if the first node's own state is not normal, for example, the first node is in the process of restarting after reset, it can discard the received information and wait for its own status. After returning to normal, the node responds after receiving the cross-connection information retransmitted by the local node again.

Step 103, judging whether the response message indicates that the cross-connection is inconsistent with the cross-connection of the LSP saved by the head node; if yes, go to step 104; otherwise, go to step 105.

Step 104, delete the cross-connection of the local LSP.

Step 105, reserve the cross-connection of the local LSP.

It should be noted that the failure of the control plane may be the failure of the control plane of this node, or the failure of the control plane of other nodes such as adjacent nodes, which causes the situation that the node needs to delete the cross-connection of the LSP of the local forwarding plane .

The above process can be applied to any node in the network except the first node. Moreover, the scenario where it is determined that the cross-connection of the local LSP needs to be deleted can be the two cases mentioned above. Of course, it can also be that the local LSP needs to be deleted in other scenarios. The situation of the cross-connection of the LSP, which is not limited in this embodiment of the present invention. That is to say, when it is necessary to delete the cross-connection of the local LSP, and to determine which cross-connection of LSPs to delete, etc., can be performed according to the processing method in the existing protocol.

In addition, after the local node deletes the cross-connection of the local LSP according to the response message from the head node, it also sends a signaling message to the downstream node to delete the cross-connection of the corresponding LSP. Let me repeat.

In the above step 101, when sending the cross-connection information to the head node, it may be sent by setting a dedicated message.

For example, a cross-confirmation request message may be sent to the head node of the LSP, and the cross-connection information is carried in the cross-confirmation request message.

Depending on the application environment, there may be one or more cross-connections of the local LSP that the node needs to delete. Due to the pressure of normal network communication, the local node can send the information of multiple cross-connections in one cross-confirmation request message, provided that the head nodes of the LSPs corresponding to these cross-connections are the same.

In addition, in order to ensure the reliability of message sending, when sending the cross-confirmation request message, a retransmission confirmation mechanism can be adopted, that is, if the local node does not receive the response message returned by the first node within a predetermined time, the cross-confirmation will be resent request message. The number of retransmissions may be determined as required, for example, 2 times. The implementation of the retransmission confirmation mechanism is similar to that in the prior art, and will not be described in detail here.

The cross-confirmation request message may have various structures, for example, the structure shown in Table 1 below may be adopted.

Table 1:

Among them, the meaning of each field is as follows:

Msg_Length, message length, in bytes;

Msg_Type = 60;

Version=01;

Msg_ID, message ID, used for retransmission and confirmation;

Lsp_XC_Object: LSP cross information.

Correspondingly, in the above step 102, the response message returned by the head node may also have various structural forms. For example, corresponding to the cross-confirmation request message shown in Table 1 above, the response message may adopt the structure shown in Table 2 below.

Table 2:

Among them, the meaning of each field is as follows:

Msg_Length, message length, in bytes.

Msg_Type = 61;

Version=01;

Msg_ID: Message ID, used for retransmission and confirmation;

Lsp_XC_Type: 0 means consistent crossing, 1 means inconsistent crossing.

Len: The lengths of consistent crossover and inconsistent crossover in the message.

Lsp_XC_Object: cross information.

It should be noted that the above structure is only a specific example, and this embodiment of the present invention does not limit the specific structure of the cross-confirmation request message. Of course, other dedicated messages may also be used.

The embodiment of the present invention prevents the control plane failure from affecting the operation of the forwarding plane. After the control plane fails, when the node needs to delete the cross-connection of the LSP of the local forwarding plane, it does not delete it directly, but first deletes the cross-connection information It is sent to the head node of the LSP, and then decides whether to delete the cross-connection of the LSP according to the confirmation result of the cross-connection by the head node. Because whether it is the cross-connection of the LSP established by the user-side call initiation or the cross-connection of the LSP issued by the network management configuration, the head node always retains the data of the most reliable cross-connection of the LSP. Therefore, using the data of the head node as the confirmation standard is more reliable than confirming based on the data of the upstream and downstream adjacent nodes.

In the network, if a certain node is only abnormal in the control plane and the forwarding plane is normal, using the method of the embodiment of the present invention to prevent the failure of the control plane from affecting the operation of the forwarding plane can ensure that the failure of the control plane does not affect the normal use of the forwarding plane. Improve the reliability of the forwarding plane. Not only can avoid the inconsistency of control plane information between network nodes, but also can quickly and accurately detect and clear the inconsistent cross-connection of LSP when there is inconsistency in the cross-connection of control plane and forwarding plane LSP on the node, so as to ensure the resources on the network available, and can avoid mistakenly deleting the cross-connection of the LSP, thereby avoiding the interruption of normal services.

In the MPLS network including its extension protocol GMPLS and MPLS-TP network, the method of the embodiment of the present invention can support the simultaneous reset operation of multi-node control planes in the network, and improve the upgrading and maintenance efficiency of the network.

For example, if a network consisting of 2,000 nodes needs to upgrade the software version, if the traditional GR mechanism is used, it is required that adjacent nodes cannot be reset at the same time, which requires that the reset of nodes must be performed serially. With the method of the embodiment of the present invention, since the control planes of adjacent nodes are reset at the same time, the operation of the forwarding plane will not be affected. Therefore, after the software loading of each node is completed, all nodes can be reset in parallel to improve the network upgrade efficiency.

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

Correspondingly, an embodiment of the present invention also provides a node, as shown in FIG. 2 , which is a schematic structural diagram of the node.

In this embodiment, the node 200 includes:

The information sending unit 201 is configured to send the information of the cross-connection to the head node of the LSP when the node needs to delete the cross-connection of the LSP of the local forwarding plane after a fault occurs in the control plane;

A response message receiving unit 202, configured to receive a response message returned by the head node;

The cross-connection information maintenance unit 203 is configured to delete the cross-connection of the local LSP when the response message indicates that the cross-connection of the LSP is inconsistent with the cross-connection of the LSP saved by the head node; otherwise, keep the cross-connection of the local LSP connect.

In a specific application, the information sending unit 201 may send a cross-confirmation request message to the head node, and carry the information of the cross-connection in the confirmation request message. Moreover, if necessary, the cross-confirmation request message may carry information of multiple cross-connections to be deleted at the same time, and the head nodes of the LSPs corresponding to the multiple cross-connections are the same. Moreover, the confirmation request message may be sent using a retransmission confirmation mechanism. For example, the information sending unit 201 resends the crossover Confirm the request message.

Certainly, the information sending unit 201 may also send the information of the cross-connection to the head node through other dedicated messages. For details, reference may be made to the description in the method for preventing a control plane failure from affecting the operation of the forwarding plane in the embodiment of the present invention, and no further details are given here.

In the node of the embodiment of the present invention, after the control plane fails, when the node needs to delete the cross-connection of the LSP of the local forwarding plane, it does not delete it directly, but first sends the information of the cross-connection to the head node of the LSP , and then decide whether to delete the cross-connection of the LSP according to the confirmation result of the cross-connection by the head node, thereby avoiding the data inconsistency between the control plane and the forwarding plane inside the node, and avoiding the mistaken deletion of the cross-connection of the LSP, interrupting normal business.

Correspondingly, the embodiment of the present invention also provides another node, as shown in FIG. 3 , which is a schematic structural diagram of the node.

In this embodiment, the node 300 includes:

An information receiving unit 301, configured to receive cross-connect information sent by other nodes;

A judging unit 302, configured to determine the LSP corresponding to the cross-connection, and judge whether the received cross-connection is consistent with the cross-connection of the LSP saved by itself;

The response unit 303 is configured to return a response message to the other node, and indicate in the response message whether the cross-connection is consistent with the cross-connection of the LSP saved by itself.

The response message may adopt different structural forms as required, and for details, refer to the foregoing description.

Correspondingly, the embodiment of the present invention also provides a system for avoiding the failure of the control plane from affecting the operation of the forwarding plane, as shown in FIG. 4 , which is a schematic structural diagram of the system.

In FIG. 4 , the system includes: a head node 400 and other nodes 401 connected through an LSP.

It should be noted that there may be multiple other nodes, which may be intermediate nodes or end nodes, that is, an LSP includes an initial node, an end node, and one or more intermediate nodes.

For clarity, only one other node is shown in FIG. 4 . in:

The other node 401 is used to send the information of the cross-connection to the head node 400 of the LSP when the node needs to delete the cross-connection of the LSP of the local forwarding plane after the failure of the control plane, and When the response message returned by the head node 400 indicates that the cross-connection is inconsistent with the cross-connection of the LSP saved by the head node, delete the cross-connection of the local LSP;

The head node 400 is configured to receive the information of the cross-connection sent by the other node 401, determine the LSP corresponding to the cross-connection, and judge whether the cross-connection is consistent with the cross-connection of the LSP saved by itself, and report to the head node 400 The other node 401 returns a response message, and the response message indicates whether the cross-connection is consistent with the LSP cross-connection saved by itself.

Using the embodiment of the present invention to prevent the control plane failure from affecting the operation of the forwarding plane, after the node control plane fails and the communication is restored, not only the inconsistency of the control plane information between network nodes can be avoided, but also the control plane and the network inside the node can be avoided. When the data on the forwarding plane is inconsistent, the cross-connection of the LSP is mistakenly deleted, interrupting normal services and improving the reliability of the forwarding plane.

The following uses an example to further describe in detail the difference between the processing procedure of each node in the system in which the fault of the control plane does not affect the operation of the forwarding plane in the embodiment of the present invention when the cross-connection of the forwarding plane needs to be deleted and the prior art.

As shown in Figure 5, it is assumed that there are four nodes in the MPLS network, namely: A, B, C, and D, in which an LSP has been established, and the path is {A->B->D}. In this LSP, relevant components of the control plane and the forwarding plane are respectively established on nodes A, B, and C. The PSB on node A will periodically send refresh messages to the PSB on node B, the PSB on node B will periodically send refresh messages to the PSB on node D, and the reverse RSB will also send refresh messages. At the same time, the adjacent nodes of nodes A, B, and C will periodically send Hello messages to confirm the connection relationship with each other.

Assume that the control plane failure is caused by the control board reset of Node B, and assume that the GR time is T1.

In the prior art, the processing procedures of nodes A, B, and D are as follows:

Node A: detects that it cannot continue to receive the Hello message from Node B, and cannot receive the RSB refresh message from Node B either. So node A thinks that node B has entered the reset process. Node A starts a waiting timer with a time of T1. There are two possibilities for subsequent actions:

(1) At the end of T1, node B does not resume communication with node A, and node A will delete the cross-connection, PSB, and RSB maintained by itself at this time.

(2) At the end of T1, node B resumes communication with node A, that is, node A receives the Hello message from node B again. At this time, node A will send the PSB information maintained by itself to node B.

Node D: Similar to the action of node A. The difference is that in the above (2) case, the node sends RSB information.

Node B: In the process of reset and restart, there are two possibilities:

(1) Within T1 time, node B did not complete the startup and recovery, and node B established Hello messages with nodes A and node D after T1 time. At this time, node B will wait for node A and node D to send PSB and RSB information to itself respectively, but because the PSB and RSB on node A and node D have been released, node B will not receive the message, after a certain period of time ( Suppose it is T2), node B will release the cross-connection maintained by itself. At this time, there is no PSB, RSB, or cross-connect corresponding to the LSP on Node B.

(2) Within T1 time, node B completes the establishment of communication with nodes A and D, that is, restarts sending and receiving Hello messages with nodes A and D. At this time, Node B will receive PSB and RSB messages from Node A and Node D, and Node B will use the information to rebuild the PSB and RSB of its own control plane, and compare it with the cross-connection maintained by its own forwarding plane. If If they are consistent, they will not be modified. If they are inconsistent, they will be modified, or redundant cross-connections will be deleted, or missing cross-connections will be added.

Utilizing the method and system provided by the embodiments of the present invention, the processing procedures of nodes A, B, and D are as follows:

Node A: detects that it cannot continue to receive the Hello message from Node B, and cannot receive the RSB refresh message from Node B either. So node A thinks that node B has entered the reset process. Node A starts a waiting timer with a time of T1. There are two possibilities for subsequent actions:

(1) At the end of T1, node B does not resume communication with node A. At this time, node A is the first node of the LSP, so it does not need to send a cross-confirmation message to the first node, and only needs to judge whether this LSP needs Deletion, if deletion is required, node A will delete the cross-connection, PSB, and RSB maintained by itself.

(2) At the end of T1, node B completes the communication with node A, that is, node A receives the Hello message from node B again. At this time, node A will send the PSB information maintained by itself to node B.

Node D: Send a cross-confirmation request message to the head node, in which the request message carries the information of the cross-connection of the LSP, if the response message of the head node indicates that the cross-connection is inconsistent with the cross-connection of the LSP saved by the head node, then Node D deletes the cross-connection, PSB, and RSB maintained by itself corresponding to the LSP. Otherwise, the information will be kept until Node B recovers.

Node B: After recovery, re-establish communication with nodes A and D, that is, restart sending and receiving Hello messages with nodes A and D, node B will receive PSB and RSB messages from nodes A and D, and node B will send these The information is compared with the cross-connection maintained by its own forwarding plane. There are two possibilities:

(1) If consistent, do not modify.

(2) If inconsistent, send a cross-confirmation request message to the head node A, and determine whether to delete the cross-connection, PSB, and RSB maintained by itself corresponding to the LSP according to the indication in the response message of the head node A. .

The embodiments of the present invention have been described in detail above, and the present invention has been described using specific implementation methods herein. The descriptions of the above embodiments are only used to help understand the method and equipment of the present invention; meanwhile, for those of ordinary skill in the art, According to the idea of the present invention, there will be changes in the specific implementation and scope of application. To sum up, the contents of this specification should not be construed as limiting the present invention.

Claims (11)

1. a method of avoiding the operation of control plane fault effects Forwarding plane, is characterized in that, comprising:

After control plane breaks down, when this node need to be deleted the interconnection of LSP of local Forwarding plane, described cross-coupled information is sent to the first node of described LSP;

Receive the response message that first node returns;

If described response message indicates the interconnection of the interconnection of described LSP and the described LSP of first node preservation inconsistent, the interconnection of deleting local LSP;

Otherwise, retain the interconnection of local LSP.

2. method according to claim 1, is characterized in that, describedly sends to the first node of described LSP to comprise described cross-coupled information:

By cross validation request message, described cross-coupled information is sent to the first node of described LSP.

3. method according to claim 2, is characterized in that, described method also comprises:

Multiple if the interconnection that needs to delete has, and the first node of LSP corresponding to described multiple interconnection is identical, in described cross validation request message, carries described multiple cross-coupled information.

4. according to the method in claim 2 or 3, it is characterized in that, described method also comprises:

If this node is not received the response message that first node returns in the given time, resend described cross validation request message.

5. method according to claim 1, is characterized in that, described method also comprises:

First node receives after described cross-coupled information, determines the LSP that described interconnection is corresponding;

Judge that whether described interconnection is consistent with the interconnection of the local described LSP preserving of first node;

Whether first node returns to response message to described node, and in described response message, indicate the interconnection of described LSP consistent with the interconnection of the described LSP of first node preservation.

6. a node, is characterized in that, comprising:

Information transmitting unit, after breaking down at control plane, when this node need to be deleted the interconnection of LSP of local Forwarding plane, sends to described cross-coupled information the first node of described LSP;

Response message receiving element, the response message returning for receiving first node;

Intersection information maintenance unit, when indicate the interconnection of the described LSP that the interconnection of described LSP and first node preserve inconsistent at described response message, the interconnection of deleting local LSP; Otherwise, retain the interconnection of local LSP.

7. node according to claim 6, is characterized in that,

Described information transmitting unit, specifically for sending to described cross-coupled information by cross validation request message the first node of described LSP.

8. node according to claim 7, is characterized in that,

In described cross validation request message, carry multiple cross-coupled information, the first node of LSP corresponding to described multiple interconnections is identical.

9. according to the node described in claim 7 or 8, it is characterized in that,

Described information transmitting unit, also when do not receive in the given time the response message that first node returns at described response message receiving element, resends described cross validation request message.

10. a first node, is characterized in that, comprising:

Information receiving unit, the cross-coupled information sending for receiving other node;

Judging unit, for determining LSP corresponding to described interconnection, and whether the interconnection that judgement receives is consistent with the interconnection of the described LSP oneself preserving;

Response unit, for returning to response message to described other node, and in described response message, indicate described interconnection whether consistent with the interconnection of the described LSP oneself preserving, to make described other node indicate the interconnection of described LSP and the interconnection of the described LSP of described first node preservation when inconsistent at described response message, the interconnection of deleting local LSP; Indicate the interconnection of described LSP and the interconnection of the described LSP that described first node is preserved when consistent at described response message, retain the interconnection of local LSP.

Avoid the system of control plane fault effects Forwarding plane operation for 11. 1 kinds, it is characterized in that, comprising: the first node being connected by LSP and other node;

Described other node, comprising:

Information transmitting unit, after breaking down at control plane, when this node need to be deleted the interconnection of LSP of local Forwarding plane, sends to described cross-coupled information the first node of described LSP;

Response message receiving element, the response message returning for receiving first node;

Intersection information maintenance unit, when indicate the interconnection of the described LSP that the interconnection of described LSP and first node preserve inconsistent at described response message, the interconnection of deleting local LSP; Otherwise, retain the interconnection of local LSP;

Described first node, comprising:

Information receiving unit, the cross-coupled information sending for receiving other node;

Judging unit, for determining LSP corresponding to described interconnection, and whether the interconnection that judgement receives is consistent with the interconnection of the described LSP oneself preserving;

Response unit, for returning to response message to described other node, and in described response message, indicate described interconnection whether consistent with the interconnection of the described LSP oneself preserving, to make described other node indicate the interconnection of described LSP and the interconnection of the described LSP of described first node preservation when inconsistent at described response message, the interconnection of deleting local LSP; Indicate the interconnection of described LSP and the interconnection of the described LSP that described first node is preserved when consistent at described response message, retain the interconnection of local LSP.