WO2015067048A1

WO2015067048A1 - Vpls cross-domain redundancy protection method and system

Info

Publication number: WO2015067048A1
Application number: PCT/CN2014/079885
Authority: WO
Inventors: 易放军; 雷华; 江乐
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-11-05
Filing date: 2014-06-13
Publication date: 2015-05-14
Also published as: RU2016118682A; CN104618233A

Abstract

A VPLS cross-domain redundancy protection method and system. The method comprises: when a first pseudo wire (PW) between a first VPLS domain between a second VPLS domain is faulty, performing data forwarding by using a second PW between the first VPLS domain and the second VPLS domain, the first PW being connected between a first SPE border node in the first VPLS domain and a third SPE border node in the second VPLS domain, the second PW being connected between a second SPE border node in the first VPLS domain and a four SPE border node in the second VPLS domain, and the second SPE border node and the four SPE border node being respectively added to the first VPLS domain and the second VPLS domain in advance. Therefore, a traffic loss caused by a link fault between domains and a border node fault is reduced.

Description

The present invention relates to the field of communications, and in particular to a VPLS cross-domain redundancy protection method and system. A Pseudo Wire (PW) connection must be established between nodes of a virtual private LAN service (VPLS) network. As the number of nodes in the topology increases, the hub The pseudowire (HUB PW) scale grows exponentially, which undoubtedly increases the signaling overhead and maintenance costs of the network. In order to reduce the number of connections too large, hierarchical H-VPLS is usually used. As shown in Figure 1, the SPOKE PW is used to connect between adjacent HUB domains, enabling communication between all nodes and reducing the number of HUB connections. However, once the critical SPOKE PW fails, communication between the two domains is inevitably interrupted. The use of SPOKE PW to walk through TUNNEL FRR can effectively protect the link failure, but once the boundary SPE node fails, the link still cannot be effectively protected. Therefore, whether the SPOKE PW fails or the boundary SPE node fails, the link will still be unable to be effectively protected and cause traffic loss. In view of the problem that the link failure between the VPLS domain and the fault of the boundary node are likely to cause communication interruption and traffic loss in the related art, an effective solution has not been proposed yet. SUMMARY OF THE INVENTION The present invention provides a VPLS cross-domain redundancy protection method and system to solve at least the above problems. According to an aspect of the present invention, a VPLS cross-domain redundancy protection method is provided, including: when a first pseudowire PW between a first VPLS domain and a second VPLS domain fails, using a first VPLS domain Performing data forwarding with the second pseudowire PW between the second VPLS domain, where the first PW is connected between the first SPE boundary node in the first VPLS domain and the third SPE boundary node in the second VPLS domain, The second PW is connected between the second SPE boundary node in the first VPLS domain and the fourth SPE boundary node in the second VPLS domain, and the second SPE boundary node and the fourth SPE boundary node are respectively in the first VPLS domain. , the second VPLS domain is added. Preferably, the first SPE border node and the second SPE border node communicate through the ICCP link, where the content of the communication includes: configuration information of the first PW, status information of the first PW, configuration information of the second PW, And the status information of the second PW, where the status information of the first PW is used to indicate whether the first PW has a fault, and the second PW status information is used to indicate whether the second PW has a fault. Preferably, the first PW state information includes: first detection state information and first protocol state information, where the first detection state information includes: bfd, tp-oam of the first PW; the second PW state information includes: Detecting the status information and the second protocol status information, where the second detection status information includes: bfd, tp-oam of the second PW _; wherein the first protocol status information and the second protocol status information both include: PW negotiation result, external Layer lsp, or tunnel state. Preferably, the method further comprises: performing data forwarding using the first PW and the second PW in the event of a failure of the ICCP link, and blocking the HUB PW between the first SPE boundary node and the second SPE boundary node. Preferably, the method further includes: when the first SPE border node fails, using the second PW for data forwarding. Preferably, the method further comprises: when the first SPE boundary node and the ICCP link both fail, use the second PW for data forwarding, and block the HUB PW between the first SPE boundary node and the second SPE boundary node. Preferably, the first SPE boundary node and the second SPE boundary node constitute an active end device, and the third SPE boundary node and the fourth SPE boundary node constitute a passive end device. Preferably, in the case that the first PW is determined as the working PW according to the preset PW priority and the working state of the PW, the method further includes: blocking the second PW, and learning to delete the second PW at the active end device The media access controls the MAC, and notifies the passive device and the other passive devices connected to the passive device to perform the MAC revocation operation and re-learn the MAC; the first SPE border node notifies the result that the first PW is determined to be the working PW The third SPE border node, and the second SPE border node notify the fourth SPE border node of the result that the second PW is determined to be the backup PW. According to another aspect of the present invention, a VPLS cross-domain redundancy protection system is provided, including: a switching module, configured to: when a first pseudowire PW between a first VPLS domain and a second VPLS domain fails, Performing data forwarding using a second pseudowire PW between the first VPLS domain and the second VPLS domain, where the first PW is connected to the first SPE boundary node in the first VPLS domain and the third in the second VPLS domain. Between the SPE boundary nodes, the second PW is connected between the second SPE boundary node in the first VPLS domain and the fourth SPE boundary node in the second VPLS domain, and the second SPE boundary node and the fourth SPE boundary node are in advance. The settings are added in the first VPLS domain and the second VPLS domain, respectively. Preferably, the first SPE border node and the second SPE border node communicate through the ICCP link, where the content of the communication includes: configuration information of the first PW, status information of the first PW, configuration information of the second PW, and The second PW status information, where the status information of the first PW is used to indicate whether the first PW has a fault, and the status information of the second PW is used to indicate whether the second PW has a fault. According to the present invention, in the case that the current working PW between two adjacent VPLS domains fails, data forwarding between two VPLS domains is performed by using a standby PW preset between two adjacent VPLS domains. In order to ensure uninterrupted data, the problem of communication interruption and traffic loss caused by link failure and boundary node failure in VPLS domain is solved, and the effect of reducing traffic loss caused by inter-domain link failure and boundary node failure is achieved. . BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 1 is a flowchart of a VPLS cross-domain redundancy protection method according to an embodiment of the present invention; FIG. 2 is a schematic structural diagram of a VPLS cross-domain redundancy protection method system according to an embodiment of the present invention; FIG. 4 is a schematic diagram of a working mode of a boundary SPE of a cross-domain H-VPLS according to a preferred embodiment of the present invention; FIG. 5 is a PW link according to a preferred embodiment of the present invention. FIG. 6 is a schematic diagram of a working mode of a boundary node SPE when a boundary node fails according to a preferred embodiment of the present invention; FIG. 7 is a schematic diagram of a working mode of a boundary SPE when ICCP signaling fails according to a preferred embodiment of the present invention. 8 is a decision flow chart of MC-PW-GROUP according to a preferred embodiment of the present invention; FIG. 9 is a schematic diagram of processing of MC-PW-GROUP decision result forwarding in accordance with a preferred embodiment of the present invention; FIG. Schematic diagram of the processing of forwarding when the ICCP signaling of the preferred embodiment fails. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. In order to solve the above technical problem, the embodiment of the present invention mainly provides a VPLS cross-domain redundancy protection method and system (establishing a protection decision mechanism between adjacent VPLS domains) to achieve redundancy backup of inter-domain PW and SPE nodes. purpose. After the working PW (or the working PW-side SPE) fails, the backup PW and SPE can start working in time to ensure that the traffic between the entire domain remains unblocked. The embodiment of the invention provides a VPLS cross-domain redundancy protection method. FIG. 1 is a flowchart of a VPLS cross-domain redundancy protection method according to an embodiment of the present invention. As shown in FIG. 1 , the method mainly includes the following steps (step S102): Step S102, when a first VPLS domain and a second VPLS domain are used. When the first pseudowire PW fails, data forwarding is performed by using a second pseudowire PW between the first VPLS domain and the second VPLS domain, where the first PW is connected to the first in the first VPLS domain. Between the SPE boundary node and the third SPE boundary node in the second VPLS domain, the second PW is connected between the second SPE boundary node in the first VPLS domain and the fourth SPE boundary node in the second VPLS domain, The two SPE boundary nodes and the fourth SPE boundary node are added in advance in the first VPLS domain and the second VPLS domain, respectively. Through this step, when the current working PW between the two adjacent VPLS domains fails, the data forwarding between the two VPLS domains can be continued by using the standby PW preset between the two adjacent VPLS domains. Ensure that the data is not interrupted. In this embodiment, the first SPE border node and the second SPE border node may communicate through the ICCP link, where the content of the communication may include: configuration information of the first PW, status information of the first PW, and second PW And the configuration information of the second PW, where the status information of the first PW is used to indicate whether the first PW is faulty, and the second PW status information is used to indicate whether the second PW is faulty. In this embodiment, the first PW state information may include: first detection state information and first protocol state information, where the first detection state information may include: bfd, tp-oam of the first PW; second PW state The information includes: second detection status information and second protocol status information, where the second detection status information may include: bfd, tp-oam of the second PW; wherein the first protocol status information and the second protocol status information are both Includes: PW negotiation results, outer lsp, or tunnel status. In this embodiment, in the case that the ICCP link fails, the first PW and the second PW may be used for data forwarding, and the HUB PW between the first SPE boundary node and the second SPE boundary node is blocked. Preferably, when the first SPE border node fails, the second PW may be used for data forwarding. In this embodiment, when both the first SPE border node and the ICCP link fail, the second PW may be used for data forwarding, and the HUB PW between the first SPE boundary node and the second SPE boundary node is blocked. In the case where these three types of failures occur, data forwarding can be ensured without interruption by this embodiment. In this embodiment, the first SPE boundary node and the second SPE boundary node constitute an active end device, and the third SPE boundary node and the fourth SPE boundary node constitute a passive end device. In the case that the first PW is determined as the working PW according to the preset PW priority and the working state of the PW, the second PW may also be blocked, and the media access control MAC learned by the second PW is deleted at the active end device. And notifying the passive device and the other passive devices adjacent to the passive device to perform the MAC revocation operation and re-learning the MAC; the first SPE boundary node notifying the third SPE boundary node of the result that the first PW is determined to be the working PW, And the second SPE border node notifies the fourth SPE boundary node of the result that the second PW is determined to be the backup PW. The embodiment of the invention further provides a VPLS cross-domain redundancy protection system. FIG. 2 is a schematic structural diagram of a VPLS cross-domain redundancy protection method system according to an embodiment of the present invention. As shown in FIG. 2, the system includes: a switching module 10. The switching module 10 is configured to use a second pseudowire PW between the first VPLS domain and the second VPLS domain when the first pseudowire PW between the first VPLS domain and the second VPLS domain fails. Performing data forwarding, where the first PW is connected between the first SPE boundary node in the first VPLS domain and the third SPE boundary node in the second VPLS domain, and the second PW is connected to the second in the first VPLS domain. The second SPE boundary node and the fourth SPE boundary node are added in advance in the first VPLS domain and the second VPLS domain, respectively, between the SPE boundary node and the fourth SPE boundary node in the second VPLS domain. In this embodiment, the first SPE border node and the second SPE border node may communicate through the ICCP link, where the content of the communication may include: configuration information of the first PW, status information of the first PW, and second PW The configuration information, and the second PW status information, where the status information of the first PW is used to indicate whether the first PW has a fault, and the status information of the second PW is used to indicate whether the second PW has a fault. The VPLS cross-domain redundancy protection method and system provided by the foregoing embodiments solve the problem that the link failure and the boundary node failure in the VPLS domain are likely to cause communication interruption and traffic loss, and the inter-domain link failure and the boundary node are reduced. The effect of traffic loss caused by a fault. The VPLS cross-domain redundancy protection method and system provided by the foregoing embodiments are described and illustrated in more detail below with reference to FIG. 3 to FIG. 10 and the preferred embodiment. The preferred embodiment relates to a packet-switched communication network. When a hierarchical VPLS network is used for topology deployment, in order to prevent the VPLS domain from communicating due to the failure of the SPOKE PW, the present embodiment proposes to deploy a redundant SPOKE PW. The SPOKE PW between the inter-domain boundary nodes is redundantly protected by a specific blocking selection method, and does not cause a forwarding loop. In the preferred embodiment, an SPE boundary node is added to each VPLS connection domain, and a SPOKE PW is added as a backup PW between the newly added boundary nodes, and the current redundancy negotiation mechanism is used to determine that the current operation should be performed. The PW is used for forwarding, and the PW that is not working is blocked by traffic. Reference may be made to FIG. 4 (FIG. 4 is a schematic diagram of a boundary SPE working mode of an inter-area H-VPLS according to a preferred embodiment of the present invention), as shown in FIG. 4, whether the inter-domain SPOKE PW fault or the boundary SPE fault decision mechanism can The correct selection of the working PW in time can reduce the traffic loss caused by the inter-domain link failure and the boundary node failure. In the preferred embodiment, ICCP can be utilized for signaling communication between SPE devices. The ICCP's TCP/IP channel ensures proper and orderly delivery of signaling. Two boundary nodes of one VPLS Hub domain are selected as the active decision master (master) device, and two boundary nodes of the other VPLS Hub domain are used as passive decision-making (slave) devices. The two SPEs on the active decision side exchange signaling through ICCP, synchronize configuration and status information, and make decision decisions based on this. Finally, the working PW is selected to block the non-working PW. The neighboring mac withdraw is advertised on the blocked SPE node, and the decision result of the PW redundancy selection needs to be notified to the border node of another VPLS domain. If the decision result received by the peer border SPE is not forwarded by the SPOKE PW of the SPE node, the MAC withdraw is notified to the neighbor. Through the decision mechanism, it is possible to select a new one for the current working SPOKE PW failure (here, FIG. 5, FIG. 5 is a schematic diagram of the working mode of the boundary SPE when the PW link fails according to a preferred embodiment of the present invention) The forwarded PW information causes other nodes in the two domains to refresh the mac forwarding entries. The traffic converges on the new available link in a shorter period of time, reducing the loss of traffic. Further, the implementation process of the preferred embodiment mainly includes:

(1) MC-PW-GROUP decision state negotiation. FIG. 3 is a schematic diagram of a cross-domain H-VPLS deployment manner according to a preferred embodiment of the present invention. As shown in FIG. 3, SPE1 and SPE2 are in the boundary of a full mesh VPLS domain, and SPE3 and SPE4 are in another full mesh at the boundary. The boundary of the VPLS domain. There is a SPOKE pseudowire PW1 (ie, the above first PW) connection between SPE 1 and SPE 3, and a SPOKE pseudowire PW2 (ie, the above second PW) connection between SPE 2 and SPE 4. The configuration selects SPE 1 and SPE 2 as the master node, and SPE 3 and SPE 4 as the slave nodes. On the SPE 1 and the SPE 2, the MC-PW-GROUP is deployed. PW1 and PW2 are added as the active and standby members of the protection group. The MC-PW-GROUP on SPE 1 and SPE 2 are associated with the ICCP application, using the same roid to identify the matching protection group. Here, the detection status of the PW (for example, bfd, tp-oam, etc.) and the protocol status (for example, the pw negotiation result, the outer layer lsp or the tunnel status, etc.) may be collectively referred to as PW status information, and the information may be used to indicate the PW. Whether there is a fault, SPE 1 and SPE 2 need to synchronize this part of the information.

After both SPE 1 and SPE 2 get the PW1 and PW2 status information, the forwarding result can be determined. If both PW1 and PW2 are fault-free, PW1 is preferred as the working PW; if one PW is faulty, the non-faulty PW is selected; if both PW1 and PW2 are faulty, PW1 is selected. 6 is a schematic diagram of a working mode of a boundary SPE when a boundary node fails according to a preferred embodiment of the present invention, as shown in FIG.

As shown in Figure 6, in the scenario where the border SPE fails and the ICCP signaling fails, the traffic is interrupted. Each border SPE sets the local SPOKE PW to be forwarded when the MC-PW-GROUP signaling negotiation fails, and blocks the domain. HUB PW between two border devices to prevent looping. For a detailed process description, please refer to FIG. 8 (FIG. 8 is a decision flow chart of MC-PW-GROUP according to a preferred embodiment of the present invention). (2) The MC-PW-GROUP decision result affects the PW forwarding traffic. For the decision result of the MC-PW-GROUP, the traffic of the working pw is opened, and the PW traffic that does not work is blocked. On the active side, the mac that is blocked by the pw is actively deleted, and mac withdraw is sent to the neighbor PE and the inter-domain SPE, so that each node refreshes the mac entries on all PWs. The SPE on the active side also needs to send the SPOKE PW to the active/standby to the passive SPE. If the passive side SPE receives the SPOKE PW and is selected as the inactive PW, it deletes the mac learned from the PW and sends a MAC withdraw to its neighbor PE. Through the above traffic blocking and mac withdraw transmission, it can ensure that traffic between domains converges to the SPOKE PW of the decision. The two SPOKE PWs are mutually protected, ensuring that network traffic forwarding is not affected when a PW link failure (see Figure 5) occurs. For a description of the process, please refer to FIG. 9 (FIG. 9 is a schematic diagram of processing of forwarding of MC-PW-GROUP decision results according to a preferred embodiment of the present invention). (3) SPE node failure or ICCP signaling failure for redundancy protection. If SPE1 fails (see Figure 6), the ICCP chain break causes the signaling interaction to be interrupted and the MC-PW-GROUP negotiation fails. SPE2 will release the traffic forwarding from PW2 and issue a mac withdraw to the PW. After receiving the mac withdraw from the SPOKE PW, SPE 4 will further forward it to the neighbor node. The final traffic can converge to lj PW2. Figure 7 is a schematic diagram of the operation of the boundary SPE when the ICCP signaling fails according to a preferred embodiment of the present invention. As shown in Figure 7, if the ICCP link fails, the signaling is interrupted, SPE 1 And SPE 2 will release traffic forwarding from PW1 and PW2 respectively. However, if PW1, PW2, PW3, and PW4 are in the forwarding state, a forwarding loop will be formed. Therefore, once the MC-PW-GROUP cannot be negotiated successfully, when the SPOKE PW is enabled, the hub pseudowire PW3 between the SPEs is also performed. Blocked. For a detailed description of the process, please refer to FIG. 10 (FIG. 10 is a schematic diagram of processing of forwarding when ICCP signaling fails according to a preferred embodiment of the present invention). It should be noted that each of the above modules can be implemented by hardware. For example: a processor, including the above modules, or each of the above modules is located in one processor. In another embodiment, software is also provided for performing the technical solutions described in the above embodiments and preferred embodiments. In another embodiment, a storage medium is provided, the software being stored, including but not limited to: an optical disk, a floppy disk, a hard disk, a rewritable memory, and the like. From the above description, it can be seen that the present invention achieves the following technical effects: In the case where the current working PW between two adjacent VPLS domains fails, the pre-set between two adjacent VPLS domains is used. The standby PW performs data forwarding between the two VPLS domains to ensure that the data is not interrupted. This can solve the problem that the link failure and boundary node faults in the VPLS domain are likely to cause communication interruption and traffic loss, and the inter-domain link failure is reduced. And the effect of traffic loss caused by the failure of the boundary node. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention. Industrial Applicability As described above, a VPLS cross-domain redundancy protection method and system provided by the embodiments of the present invention have the following beneficial effects: When a current working PW between two adjacent VPLS domains fails, the use is performed. The standby PW preset between the two adjacent VPLS domains performs data forwarding between the two VPLS domains to ensure that the data is not interrupted, and the traffic caused by the inter-domain link failure and the boundary node failure is reduced. The effect of the loss.

Claims

Claim

A VPLS cross-domain redundancy protection method, including: when the first pseudowire PW between the first VPLS domain and the second VPLS domain fails, using the first VPLS domain and the second Data forwarding is performed on the second pseudowire PW between the VPLS domains, where the first PW is connected to the first SPE boundary node in the first VPLS domain and the third SPE boundary node in the second VPLS domain. The second PW is connected between the second SPE boundary node in the first VPLS domain and the fourth SPE boundary node in the second VPLS domain, the second SPE boundary node, the The fourth SPE boundary node is added in advance in the first VPLS domain and the second VPLS domain, respectively.

2. The method of claim 1, wherein the first SPE boundary node and the second SPE boundary node communicate via an ICCP link, wherein

The content of the communication includes: configuration information of the first PW, status information of the first PW, configuration information of the second PW, and status information of the second PW, where the first PW The status information is used to indicate whether the first PW is faulty, and the second PW status information is used to indicate whether the second PW has a fault.

3. The method according to claim 1, wherein

The first PW state information includes: first detection state information and first protocol state information, where the first detection state information includes: bfd, tp-oam of the first PW;

The second PW state information includes: second detection state information and second protocol state information, where the second detection state information includes: bfd, tp-oam of the second PW; wherein, the first Both the protocol status information and the second protocol status information include: a PW negotiation result, an outer layer lsp, or a tunnel status.

The method according to claim 2, wherein the method further comprises: performing data forwarding using the first PW and the second PW in case the ICCP link fails, and blocking the Between the first SPE boundary node and the second SPE boundary node

The method according to claim 1, wherein the method further comprises:

When the first SPE border node fails, the second PW is used for data forwarding. The method according to claim 2, wherein the method further comprises: when the first SPE border node and the ICCP link both fail, using the second PW for data forwarding, and blocking the A HUB PW between the first SPE boundary node and the second SPE boundary node. The method according to claim 1, wherein said first SPE boundary node and said second SPE boundary node constitute an active end device, and said third SPE boundary node and said fourth SPE boundary node constitute a passive end device . The method according to claim 7, wherein, in the case that the first PW is determined as the working PW according to the preset PW priority and the working state of the PW, the method further includes:

Blocking the second PW, deleting, by the active end device, the media access control MAC learned by the second PW, and notifying the passive device and other passive devices that are connected to the passive device one by one for performing The MAC revokes the operation and re-learns the MAC; the first SPE border node notifies the third SPE boundary node that the first PW is determined to be the working PW, and the second SPE boundary node sets the second The PW is determined to notify the fourth SPE border node as a result of backing up the PW. A VPLS inter-domain redundancy protection system, comprising: a switching module, configured to use the first VPLS domain when the first pseudowire PW between the first VPLS domain and the second VPLS domain fails Data forwarding is performed on the second pseudowire PW between the second VPLS domains, where the first PW is connected to the first SPE boundary node in the first VPLS domain and the third in the second VPLS domain. Between the SPE boundary nodes, the second PW is connected between the second SPE boundary node in the first VPLS domain and the fourth SPE boundary node in the second VPLS domain, and the second SPE boundary node The fourth SPE boundary node is added in advance in the first VPLS domain and the second VPLS domain, respectively. The system of claim 1, wherein the first SPE boundary node and the second SPE boundary node communicate via an ICCP link, wherein

The content of the communication includes: the configuration information of the first PW, the status information of the first PW, the configuration information of the second PW, and the second PW status information, where the status of the first PW The information is used to indicate whether the first PW is faulty, and the status information of the second PW is used to indicate whether the second PW is faulty.