WO2010020146A1

WO2010020146A1 - Correlative protection method, device and system for flux engineering channel

Info

Publication number: WO2010020146A1
Application number: PCT/CN2009/072963
Authority: WO
Inventors: 黄黎; 孙俊柏; 赖晓
Original assignee: 华为技术有限公司
Priority date: 2008-08-19
Filing date: 2009-07-28
Publication date: 2010-02-25
Also published as: CN101656651A

Abstract

A correlative protection method, device and system for a flux engineering channel are provided. In the instance that the network is normal, an end node receives the service flux sent by a source node via one of at least two pre-established flux engineering channels according to the preset choosing and receiving strategy; the pre-established flux engineering channels here are different flux engineering channels of which the source node is a root node and the end node is a leaf node; when the current flux engineering channel receiving the service flux goes wrong, the other flux engineering channel is switched to receiving the service flux, thereby the rapid recovery of the service flux is realized.

Description

Method, device and system for protection protection of traffic engineering tunnel

[1] This application claims priority to Chinese Patent Application No. 200810118705.8, entitled "Affiliation Protection Method and Device for Traffic Engineering Tunnels", filed on August 19, 2008, the entire contents of which are hereby incorporated by reference. Combined in this application.

[2] Technical field

[3] The present invention relates to the field of network communications, and in particular, to an association protection method and device for a traffic engineering tunnel

[4] Background of the invention

[5] Currently, multi-protocol label switching (Multi-Protoc ol Label) is usually deployed in the backbone part of the IP bearer network.

Switch, MPLS), which provides important features that pure IP forwarding cannot provide; different services use different label switching paths (Label Switch)

Path, LSP) is transmitted to isolate different services. Peer, through MPLS Traffic Engineering (Traffic

Engineer, TE) technology for bandwidth reservation, quality of service guarantee, traffic engineering control for LSP; and fast rerouting through MPLS traffic engineering (Fast

Reroute, FRR) technology protects LSPs, providing fast traffic recovery in case of network failures, achieving carrier-class reliability requirements with traffic disruptions <50ms.

[6] The services carried on the current IP bearer network generally include point to point (Point to

The service of the P2P service, such as the traditional voice service, is mainly a unicast IP packet. The FRR protection of the P2P service is taken as an example. Figure 1 shows the networking structure of the PRR protection of the P2P service. Schematic, in the figure: The tunnel from the source node to the destination node is called the primary tunnel carrying the user service, its path is the source node -> Ρ1-> Ρ2-> target node; and the side is from P1-P3-P4- target The bypass bypass tunnel of a node is a backup tunnel dedicated to protecting the primary tunnel. The protection scope of the backup tunnel is the fault of the link P1-P2 or !>2 node, where the P1 node is called the local repair point (Point of Local)

Repair, PLR) node, and the target node is called the Merge Point (MP) node. [7] When the PLR node PI detects that the protected link P1-P2 or the protected node P2 is faulty, it immediately switches the traffic to the Bypass tunnel for transmission, that is, fast re-routing to the path P1-P3-P4-target The node is transmitted on the tunnel. In order to enable the MP node to correctly process the traffic transmitted from the Bypass tunnel, the PLR node uses the label L1 assigned by the MP node to the P2 to encapsulate the label of the service traffic. The MP node described here is assigned to the label of the P2. L1 is called an MP tag.

[8] In addition to the P2P services mentioned above, with point-to-multipoint IP video (Point to Multi-

Point, P2MP) The expansion of services is becoming more and more common. In addition to carrying the original point-to-point service, the IP bearer network also needs to carry point-to-multipoint multicast services. The protection method for the P2MP traffic engineering tunnel is different. Figure 2 shows the networking structure of the P2MP traffic engineering tunnel protection. In the figure, one P2MP from the source node to the three target nodes.

The TE tunnel is the primary tunnel for transmitting user traffic, and the path is from the source node-P1-P2-target node. If the FRR protection of the node for P2 is the same as the FRR protection of the P2P tunnel, P1 is the PLR node, but The P2P case is different in that there are 3 MP nodes. To this end, in the prior art scheme, a P2MP with a PLR node P1 as a root node and three target nodes as leaf nodes is created.

Bypass tunnel, that is, P1-P3-P4-target node, uses this bypass tunnel to protect node P2

[9] From the protection scheme of the P2P or P2MP tunnel described above, since the node in the primary tunnel is protected by the Bypass tunnel, in the actual networking, the topology of the network is very Complex, so it is very cumbersome in network deployment and maintenance. If you want to completely protect the entire main tunnel, the number of bypass tunnels required will be more, which will cause serious waste of bandwidth. It is also difficult to adapt to the dynamic change of the node. In the protection of the P2MP tunnel, when the P2MP primary tunnel adds a target node or deletes a target node, it may cause the branch branches of the primary tunnel to change. The FRR protected MP node of the branch node also changes. If the MP is added, and the leaves of the original Bypass tunnel cannot cover the newly added MP, you need to add P2 MP.

The leaf of the Bypass tunnel, or a new Bypass tunnel, or a new Bypass tunnel to cover the newly added leaf; if the MP is reduced, the leaves of the Bypass tunnel may need to be deleted accordingly, but a Bypass tunnel often protects multiple hosts. Tunnel, when other main tunnels still need to be smashed, the leaves of the Bypass tunnel It is possible that it cannot be deleted. After the FRR protection switching occurs, excess traffic is transmitted to the MP node that is not already on the primary tunnel. This causes waste of bandwidth. On the other hand, the MP node that receives the excess traffic needs to detect it. This excess traffic is discarded and this increases its processing load, resulting in a decrease in forwarding performance.

[10] In summary, the prior art solution is very cumbersome in network deployment, and the number of bypass tunnels required is also large, which causes serious waste of network bandwidth; maintenance of the same network is also difficult, scalability It is also poor, which affects the operation of the network.

[11] Summary of the invention

The embodiment of the invention provides a method, a device and a system for associating a traffic engineering tunnel, which can simplify network deployment and reduce the number of tunnels required, thereby saving the required network bandwidth. Network maintenance is easier and improves the quality of network operations.

[13] An embodiment of the present invention provides a method for associating a traffic engineering tunnel, including:

[14] The target node selects, according to the selection policy, the service traffic sent by the source node from one of the pre-established at least two traffic engineering tunnels; the pre-established at least two traffic engineering tunnels are respectively the source node The root node, the target node is a different traffic engineering tunnel of the leaf node;

[15] If the traffic engineering tunnel that receives the traffic is faulty, switch to another traffic engineering tunnel to receive service traffic.

[16] The embodiment of the present invention further provides an association protection device for a traffic engineering tunnel, where the device includes: [17] a service flow receiving unit, configured to select at least two traffic projects that are pre-established according to a selection policy. The traffic flow sent by the source node is received on one of the tunnels; the pre-established at least two traffic engineering tunnels are different traffic engineering tunnels with the source node as the root node and the target node as the leaf node respectively;

[18] The failover unit is configured to switch to another traffic engineering tunnel to receive service traffic after the traffic engineering tunnel that currently receives service traffic fails.

[19] The embodiment of the present invention further provides a transmission system for using a traffic engineering tunnel association protection method, where the system includes:

[20] a source node, configured to send traffic to the target node;

[21] the target node is configured to select at least two traffic engineering tunnels from pre-established according to the selection policy Receiving the traffic flow sent by the source node, where the pre-established at least two traffic engineering tunnels are respectively the root node, and the target node is a different traffic of the leaf node. The engineering tunnel; after the traffic engineering tunnel that receives the traffic is faulty, the target node switches to another traffic engineering tunnel to receive service traffic.

[22] It can be seen from the technical solution provided above that, in the case that the network is normal, the target node receives the service traffic sent by the source node from one of the pre-established at least two traffic engineering tunnels according to the selection policy. The pre-established at least two traffic engineering tunnels are different traffic engineering tunnels with the source node as the root node and the target node as the leaf node respectively; after the traffic engineering tunnel that currently receives the service traffic fails, switch to another Traffic is received on a traffic engineering tunnel, which enables fast recovery of service traffic. The technical solution simplifies network deployment, reduces the number of tunnels required, and saves the required network bandwidth. The same can also make network maintenance easier and improve the quality of network operations.

[23] BRIEF DESCRIPTION OF THE DRAWINGS

[24] FIG. 1 is a schematic diagram of a networking structure of FRR protection of a P2P service in the prior art;

[25] FIG. 2 is a schematic diagram of a networking structure of P2MP traffic engineering tunnel protection in the prior art;

FIG. 3 is a schematic flowchart of a method provided by an embodiment of the present invention; FIG.

4 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;

[28] FIG. 5 is a schematic structural diagram of an implementation of a specific embodiment 1 of the present invention;

FIG. 6 is a schematic structural diagram of performing related protection according to Embodiment 1 of the present invention; FIG.

Figure 7 is a schematic view showing the implementation structure of a specific embodiment 2 of the present invention.

[31] Mode for carrying out the invention

[32] The embodiment of the invention provides a method, device and system for association protection of a traffic engineering tunnel. By establishing at least two traffic engineering TE tunnels to form an association protection relationship, after the network is normal, traffic is sent from the TE tunnels to each target node, and each target node performs service traffic selection; After the TE tunnel of the current receiving service traffic of the target node is faulty, the target node performs local protection switching after detecting the fault, that is, switching to another TE tunnel to receive service traffic, thereby realizing rapid recovery of service traffic. The technical solution simplifies the network deployment, reduces the number of tunnels required, thereby saving the required network bandwidth; and the network maintenance can be further improved. Easy, improving the quality of network operations.

[33] A specific embodiment of the method of the present invention is described with reference to the accompanying drawings. FIG. 3 is a schematic flowchart of a method provided by an embodiment of the present invention, where the method includes:

[34] 31: According to the selection strategy, the traffic sent by the source node is received from one of the pre-established at least two traffic engineering tunnels.

[35] Specifically, the service traffic is first imported on the source node, and the source node sends the imported service traffic to the target node in at least two pre-established traffic engineering tunnels; the target node is configured according to a preset selection policy. Receiving traffic sent by the source node from one of the pre-established at least two traffic engineering tunnels; and the traffic received by the other traffic engineering tunnels may be discarded; monitoring may also be performed to monitor the link status, or Do other things.

[36] The above-mentioned pre-established at least two traffic engineering tunnels are different traffic engineering tunnels with the source node as the root node and the target node as the leaf node. According to the actual networking requirements, the number of source nodes may be one or two or more different; and the number of target nodes is determined according to service requirements. If it is a P2P service, the target node For one, if it is a P2MP service, then the target node can be multiple.

[37] In addition, the selection policy is preset according to the needs of the user. For example, if two pre-established traffic engineering tunnels are used, the user may set one of the primary tunnels and the other as the standby tunnel. Then, after receiving the service traffic, the target node preferentially selects to receive the service traffic from the primary tunnel, and discards the service traffic received in the standby tunnel; or after receiving the traffic traffic, the primary standby tunnel is not set, and according to the network The actual situation, select the traffic tunnel with higher transmission quality to receive, specifically to receive according to actual needs.

[38] 32: After the traffic engineering tunnel that receives the traffic is faulty, switch to another traffic engineering tunnel to receive traffic.

[39] Specifically, in the above 31, the process of transmitting and receiving service traffic in the normal network is described, and then, when the traffic engineering tunnel that currently receives the service traffic fails, it switches to one of the other traffic engineering tunnels. Receive business traffic. For example, if the traffic engineering tunnel that receives the current traffic is called the primary tunnel and the other traffic engineering tunnel is called the standby tunnel, the target node passes the pre-deployed fast fault detection mechanism after the network fault causes the primary tunnel to fail. Quick detection of the main If the tunnel fails, it switches to one of the standby tunnels to receive traffic. This forms a protection switch for the path failure. Selecting which backup tunnel to switch to to receive service traffic can be determined according to a pre-defined policy or network condition.

[40] Through the implementation of the foregoing technical solutions, the fast recovery of the service traffic can be realized, and the association protection described in the specific embodiment of the present application can be implemented by at least two tunnels, which effectively simplifies the network deployment and reduces the network deployment. The number of tunnels required, which saves the required network bandwidth; peers can also make network maintenance easier and improve the quality of network operations.

[41] It is worth noting that if the transmitted service is a P2MP service and there are multiple target nodes, then for a single target node, the traffic engineering tunnel that currently receives the traffic may be set to a different tunnel, for example If the pre-established traffic engineering tunnel is two, it is defined as tunnel 1 and tunnel 2 respectively; and the target node has 3 ports. The traffic engineering tunnel that the target node 1 currently receives service traffic is tunnel 1, and the target node 2 is currently The traffic engineering tunnel that receives the traffic is also tunnel 1, and the traffic engineering tunnel that receives the traffic traffic at the destination node 3 is tunnel 2. In this case, when tunnel 1 fails, target node 1 and destination node 2 It is necessary to switch the traffic engineering tunnel to the tunnel 2 to receive the traffic traffic; and the target node 3 does not need to perform the handover, and continues to use the tunnel 2 to receive the traffic.

[42] In addition, after performing 32 switching to another traffic engineering tunnel to receive traffic, the target node may also send an alarm message to the source node, informing the source node that the traffic engineering tunnel that originally transmitted the traffic flow has failed; After receiving the alarm information, the path of the failed traffic engineering tunnel is automatically reconstructed or repaired, and the failed traffic engineering tunnel is restored. The rerouting mechanism can be used to automatically reconstruct the path of the failed traffic engineering tunnel. It is also possible to manually repair the failed path after issuing an alarm signal. When the new path is rebuilt or repaired, the associated protection can be re-formed.

[43] In addition, if the failed tunnel is the primary tunnel, after the primary tunnel is restored, the traffic may be switched to the restored primary tunnel by automatic or manual triggering to ensure high quality of service transmission. .

[44] In addition, pre-established traffic engineering tunnels are interrelated, specifically through the inbound label mapping of these traffic engineering tunnels (In Label

Mapping, ILM) Adding a selection flag and an associated pointer to the table entry to implement traffic engineering tunneling The interconnection between the tracks, and the target node receives traffic from one of the traffic engineering tunnels. Specifically, the associated pointers in the inbound label mapping entries of each traffic engineering tunnel point to one of the other traffic engineering tunnels. When the target node selects the traffic engineering tunnel that currently receives the service traffic, the selection flag in the inbound label mapping entry of the traffic engineering tunnel that receives the service traffic is set to be selected, indicating that the service traffic is normally received; and other traffic engineering The selection flag in the inbound label mapping entry of the tunnel is set to not selected, indicating that the traffic engineering tunnel is not selected to receive service traffic.

[45] When the selected traffic engineering tunnel of the current received traffic fails, the target node locates another traffic engineering tunnel according to the indication of the associated pointer in the incoming label mapping entry of the traffic engineering tunnel that currently receives the traffic. Entering the label mapping entry; setting the selection flag in the inbound label mapping entry of the other traffic engineering tunnel to be selected, indicating that the service traffic is normally received from the another traffic engineering tunnel; and setting the faulty traffic engineering The selection flag in the inbound label mapping entry of the tunnel is not selected, indicating that the traffic engineering tunnel is not selected to receive service traffic, so that the association protection switching is completed.

[46] The embodiment of the present invention further provides an association protection device for a traffic engineering tunnel, as shown in FIG. 4 is a schematic structural diagram of the device, where the device includes a service flow receiving unit and a fault switching unit, where:

[47] the service traffic receiving unit is configured to: according to the selection policy, select, receive traffic traffic sent by the source node from one of the pre-established at least two traffic engineering tunnels; the pre-established at least two traffic flows The engineering tunnel is a different traffic engineering tunnel with the source node as the root node and the target node as the leaf node.

[48] The failover unit is configured to switch to another traffic engineering tunnel to receive service traffic after the traffic engineering tunnel that currently receives the service traffic fails. The specific switching mode is as described in the method embodiment.

[49] In addition, the device further includes an alarm sending unit, where the alarm sending unit is configured to send the alarm information to the source node, and notify the source node that the traffic engineering tunnel is faulty; wherein the source node receives the alarm After the information, rebuild or repair the path of the failed traffic engineering tunnel and recover the failed traffic engineering tunnel.

[50] In addition, the device further includes a fault detecting unit, where the fault detecting unit is configured to detect whether the two traffic engineering tunnels are faulty by using a preset fast fault detecting mechanism; Reported to the failover unit.

[51] The device described above can be integrated on the target node; it can also be set as a separate functional entity to maintain a connection relationship with the target node.

[52] The embodiment of the present invention further provides a transmission system using a traffic engineering tunnel association protection method, where the system includes a source node, a target node, and a traffic engineering tunnel, where the source node is used for the target node. Send traffic.

[53] the target node is configured to: receive, according to the selection policy, the service traffic sent by the source node from one of the at least two traffic engineering tunnels established in advance; wherein, the pre-established at least two traffic engineering The tunnel is a different traffic engineering tunnel with the source node as the root node and the target node as the leaf node.

[54] The target node is further configured to switch to another traffic engineering tunnel to receive service traffic after the traffic engineering tunnel that currently receives the service traffic fails.

[55] In addition, the target node is further configured to detect, by using a preset fast fault detection mechanism, whether the traffic engineering tunnel is faulty, and when detecting that the traffic engineering tunnel is faulty, sending an alarm information to the source node, Informing the source node that the traffic engineering tunnel has failed.

[56] In order to further describe the embodiments of the present invention, the technical solutions thereof will be further described in conjunction with specific embodiments:

[57] Embodiment 1: P2MP TE tunnel association protection of different source nodes

[58] FIG. 5 is a schematic structural diagram of an implementation of Embodiment 1 of the present invention, in which: source nodes 1 and 2 can receive traffic sent from upstream; the traffic needs to be transmitted to the target node 1. In the target node 2, the target node 3, and the target node 4; in this embodiment, the pre-established traffic engineering tunnel is two, and the specific implementation process is as follows:

[59] Create a P2MP TE tunnel with source node 1 as the root node and target node 1, target node 2, target node 3, and target node 4 as the leaf node on source node 1, called P2MP_TE_TUNNEL 1-

[60] Create another P2MP TE tunnel on the source node 2 with the source node 2 as the root node and the target node 1, the target node 2, the target node 3, and the target node 4 as the leaf nodes, called P2MP_TE_

TUNNEL2. At the same time, the tunnel needs to be associated with P2MP_TE_ after performing path calculation or path configuration. Group, SRG) is also separated so that the two tunnels can form a better mutual protection.

[61] P1MP_TE_TUNNEL1 and P2MP_TE_TUNNEL2 are 1+1-associated on the target node 1, the target node 2, the target node 3, and the target node 4 by means of protocol extension or manual configuration, that is, each leaf node is learned and maintains P2MP_TE_TUNNEL1 and P2MP_TE

The mutual protection relationship between _TUNNEL2; the peer sets the forwarding plane to control the node to receive traffic only from one of P2MP_TE_TUNNEL1 and P2MP_TE_TUNNEL2.

[62] In the first embodiment, a selection flag and an associated pointer may be added to the ILM entries of the forwarding planes of the nodes, and the associated pointers of the ILM entries of the two tunnels point to each other; For a tunnel, the selection flag of the ILM entry can be set to 1, indicating normal reception, and the selection flag of another ILM entry can be set to 0, indicating that it needs to be discarded or other processing is required.

[63] Then traffic is imported at the root nodes of the two tunnels, source node 1 and source node 2, so that the traffic is peered by two P2MPs.

The TE tunnel is sent to each leaf node, that is, the target node 1, the target node 2, the target node 3, and the target node 4. After the service traffic reaches the leaf nodes from the two tunnels, each leaf node independently receives service traffic from one of the two associated tunnels and performs subsequent normal forwarding processing according to the preset receiving policy.

[64] The above are two P2MPs.

The creation of the TE tunnel and the association of the 1st and 1st are performed. The process of "double-issue selection" of traffic is performed in the normal situation of the network. In the first embodiment, the one from which the leaf node is currently receiving traffic from the traffic is referred to as the primary tunnel, and the other is referred to as the standby tunnel. It is worth noting that the primary tunnel may be different for different leaf nodes. For example, for the target node 1, it may be receiving traffic from P2MP_TE_TUNNEL1, then the tunnel is the primary tunnel; and for the other target node 4 Said that it may be receiving traffic from P2MP_TE_TUNNEL2, then the tunnel is the primary tunnel.

[65] The following describes the network failure, 1+1 association P2MP

How to protect the TE tunnel, as shown in FIG. 6 is a schematic structural diagram of the implementation of the association protection in the first embodiment, in which: P2MP_TE_TU NNEL1 of the service traffic to the target node 1 fails due to a network failure, and P2MP_TE_TUNNEL2, which transmits traffic to the target node 4, also fails. The following takes the processing of the target node 1 as an example to illustrate the protection recovery process of the traffic: [66] First, the target node 1 passes a fast fault detection mechanism deployed in advance, such as a P2MP LSP.

BFD or P2MP MPLS OAM, etc., quickly detected that P2MP_TE_TUNNEL1 has failed.

[67] Since P2MP_TE_TUNNEL1 is the primary tunnel of the current target node 1, the target node 1 switches to the standby P2MP_TE_TUNNEL2 to receive the traffic, and the P2MP_TE_TUNNEL2 becomes the active tunnel, and the P2MP_TE_TUNNEL1 becomes the standby tunnel. It is worth noting that if the failed channel is a standby tunnel, the target node 1 will continue to receive traffic from the primary tunnel.

[68] After the handover, the target node 1 may also send a protocol message to notify the source node 1 that the primary tunnel has failed; after receiving the fault message, the source node 1 may automatically re-establish the path of the primary tunnel through the re-routing mechanism. The path is restored by manual repair. When the new path is successfully restored, the 1+1 association protection of the path is re-formed.

[69] The 1+1 protection switching and recovery process of the above target node 4 path failure is similar to that of the target node 1, and is not mentioned here.

[70] As described above, in the first embodiment, by adding a selection flag and an associated pointer to the ILM entry, the 1+1 protection switching in the event of a failure can be implemented as follows: First, the leaf node locates the ILM entry of the standby tunnel according to the associated pointer of the ILM entry of the primary tunnel; and then cancels the selection flag of the alternate tunnel ILM entry, that is, the selected flag is set to 1, and the received from the standby tunnel The traffic will be processed normally, and the standby tunnel will be converted into the active tunnel. Then, the selection flag of the ILM entry of the original primary tunnel will be set, and the selected flag will be set to 0. The original primary tunnel will be converted into the standby tunnel. It does not receive traffic from the tunnel. At this point, the 1+1 protection switch for the path failure is completed.

[71] As can be seen from the above technical solutions, P2MP

The TE tunnel association protection method is used when the traffic failure of the network failure is equal to the time when the leaf node detects the failure and the protection switching. Use BFD or MPLS

OAM and other fast detection mechanisms, the leaf node can generally detect faults in the 30ms or shorter, and generally can complete the protection switch within 20ms, thus achieving the traffic interruption performance of <50!11 ₈ . At the same time, since the association protection requires at least two tunnels, it simplifies the network deployment and reduces the number of tunnels required, thus saving the required network bandwidth; the network can also make network maintenance easier. Improve the quality of network operations; in this embodiment, P2MP for different source nodes The TE tunnel performs association protection, which can also solve the single-point failure problem of the source node, enhance the reliability and stability of the network, and improve the operation quality.

[72] Embodiment 2: P2MP TE tunnel association protection of the same source node

[73] Embodiment 1 describes P2MPs of different source nodes

TE tunnel 1+1 association protection. However, in the actual networking process, only one node in the MPLS domain can access upstream traffic due to network operation restrictions, that is, only source node 1 can access service traffic, and source node 2 cannot access service traffic. , then you can establish two P2MPs with source node 1 as the root node.

TE tunnel, and the association protection is formed. As shown in Figure 7, the implementation structure of the networking provided in the second embodiment is shown. In the figure, two pre-established traffic engineering tunnels use the source node 1 as the root node and the target node. 1. The target node 2, the target node 3, and the target node 4 are P2MP TE tunnels of leaf nodes.

[74] Two P2MP TE tunnels of the same source node are associated with two P2MPs of different source nodes.

The processing of the TE tunnel association protection is the same, and will not be mentioned here. The implementation of the above technical solutions can also simplify network deployment and reduce the number of tunnels required, thereby saving the required network bandwidth. The same can also make network maintenance easier and improve the quality of network operations.

[75] In addition, the associated protection technology described above can also be extended to the TE tunnel of P2P services, which can be used as an alternative to FR R in P2P.

If the FRR is difficult to be deployed on the TE tunnel, it is difficult to use the BFD+VRRP protection source node in the first node. This can be used to quickly recover service traffic.

[76] It should be noted that, in the above device embodiment, each unit included is only divided according to functional logic, but is not limited to the above division, as long as the corresponding function can be implemented; The specific names are also for convenience of distinguishing from each other and are not intended to limit the scope of the present invention.

[77] It will be understood by those skilled in the art that all or part of the steps in implementing the foregoing method embodiments may be performed by a program to instruct related hardware, and the corresponding program may be stored in a computer readable storage medium. Execution, including the following steps:

[78] The target node selects, according to the selection policy, the service traffic sent by the source node from one of the pre-established at least two traffic engineering tunnels; the pre-established at least two traffic engineering tunnels are respectively The source node is the root node, and the target node is a different traffic engineering tunnel of the leaf node;

[79] If the traffic engineering tunnel that receives the traffic is faulty, switch to another traffic engineering tunnel to receive service traffic.

[80] The storage medium mentioned above may be a read only memory, a magnetic disk or an optical disk or the like.

In summary, the specific embodiment of the present invention can simplify network deployment, reduce the number of tunnels required, and save the required network bandwidth. The same can also make network maintenance easier and improve network operation. quality.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art may within the technical scope disclosed by the embodiments of the present invention. Changes or substitutions that are easily conceived are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Claim

[1] A method for associating protection of a traffic engineering tunnel, characterized in that

The target node selects, according to the selection policy, the service traffic sent by the source node from one of the pre-established at least two traffic engineering tunnels; the pre-established at least two traffic engineering tunnels are respectively the source node a root node, where the target node is a different traffic engineering tunnel of a leaf node;

If the traffic engineering tunnel that receives the traffic is faulty, switch to another traffic engineering tunnel to receive service traffic.

[2] The method according to claim 1, wherein after the switching to another traffic engineering tunnel to receive service traffic, the method further includes:

Sending the alarm information to the source node, informing the source node that the traffic engineering tunnel is faulty; the source node receiving the alarm information, reconstructing or repairing the path of the failed traffic engineering tunnel, and restoring the failed traffic engineering tunnel .

[3] The method of claim 2, wherein after the recovering the failed traffic engineering tunnel, the method further comprises:

Switch to the recovered traffic engineering tunnel to receive traffic by automatic or manual triggering

[4] The method according to claim 1, wherein the traffic engineering tunnels are related to each other, and the target node selects from at least two traffic engineering tunnels established in advance according to a selection policy. The service traffic sent by the receiving source node includes:

Adding a selection flag and an association pointer respectively in the inbound label mapping entry of the traffic engineering tunnel; the association pointer points to one of the other traffic engineering tunnels;

When the target node selects the traffic engineering tunnel that currently receives the traffic, the selected flag in the inbound label mapping entry of the traffic engineering tunnel that currently receives the traffic is set to be selected, indicating that the service traffic is normally received; The selection flag in the label mapping entry is set to not selected, indicating that the traffic engineering tunnel is not selected to receive service traffic.

[5] The method according to claim 4, wherein if the traffic engineering tunnel that currently receives the traffic flow fails, the traffic is switched to another traffic engineering tunnel, and the specific traffic is received. Includes:

After the selected traffic engineering tunnel of the current received traffic fails, the target node locates the incoming label of another traffic engineering tunnel according to the indication of the associated pointer in the incoming label mapping entry of the traffic engineering tunnel that currently receives the traffic. In the mapping table entry;

Setting a selection flag in the inbound label mapping entry of the another traffic engineering tunnel to be selected, indicating that the service traffic is normally received from the another traffic engineering tunnel;

And the selected flag in the inbound label mapping entry of the failed traffic engineering tunnel is not selected, indicating that the failed traffic engineering tunnel is not selected to receive service traffic.

[6] The method according to claim 1, wherein the pre-established at least two traffic engineering tunnels have the same or different source nodes.

[7] An associated protection device for a traffic engineering tunnel, characterized in that the device comprises:

a service flow receiving unit, configured to receive, according to the selection policy, a service traffic sent by the source node from one of the pre-established at least two traffic engineering tunnels; the pre-established at least two traffic engineering tunnels are respectively The source node is a root node, and the target node is a different traffic engineering tunnel of a leaf node;

The failover unit is configured to switch to another traffic engineering tunnel to receive service traffic after the traffic engineering tunnel that currently receives the service traffic fails.

[8] The device according to claim 7, wherein the device further comprises:

The alarm sending unit is configured to send the alarm information to the source node, and notify the source node that the traffic engineering tunnel is faulty.

[9] The device according to claim 7, wherein the device further comprises:

The fault detection unit is configured to detect whether the traffic engineering tunnel is faulty by using a preset fast fault detection mechanism, and report the detection result to the fault switching unit.

[10] The device according to any one of claims 7-9, wherein the device is integrated on the target node or is provided as a separate functional entity.

[11] A transmission system using a traffic engineering tunnel association protection method, comprising: a source node, configured to send a service traffic to a target node;

The target node is configured to select at least two traffic projects that are pre-established according to the selection policy Receiving the service traffic sent by the source node on one of the tunnels; wherein the pre-established at least two traffic engineering tunnels respectively use the source node as a root node, and the target node is a different leaf node Traffic engineering tunnel; After the traffic engineering tunnel that receives the traffic is faulty, the target node switches to another traffic engineering tunnel to receive service traffic.

[12] The system of claim 11 wherein:

The target node is further configured to detect whether the traffic engineering tunnel is faulty by using a preset fast fault detection mechanism, and when detecting that the traffic engineering tunnel is faulty, send an alarm information to the source node, and notify the source node. The traffic engineering tunnel has failed.