WO2012088979A1

WO2012088979A1 - Activation method, device and system of standby lsp

Info

Publication number: WO2012088979A1
Application number: PCT/CN2011/083007
Authority: WO
Inventors: 孙俊; 易孟
Original assignee: 华为技术有限公司
Priority date: 2010-12-28
Filing date: 2011-11-26
Publication date: 2012-07-05
Also published as: CN102130830B; CN102130830A

Abstract

An activation method, device and system of an LSP are disclosed, comprising: receiving a first message from an upstream node, the first message comprising first identification information of a standby LSP; searching for a PSB corresponding to the standby LSP according to the first identification information of the standby LSP, changing a protection state of the standby LSP in the PSB from standby to active, obtaining a local cross corresponding to the standby LSP according to the PSB, and activating the local cross; if a current node is an end node, sending a second message to the upstream node after the local cross is successfully activated, the second message comprising second identification information of the standby LSP; if the current node is an intermediate node, sending the first message to a downstream node, receiving the second message from the downstream node, and sending the second message to the upstream node after the local cross is successfully activated. The embodiment of the present invention can reduce message transmission time and message processing time, thereby improving recovery performance of a service.

Description

Method, device and system for activating standby LSP

The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for activating an alternate LSP. Background technique

Optical networks are widely used because of their high service transmission rate. They can transmit customer services by establishing one or more optical network connections that meet the bandwidth requirements of customers. The reliability of service transmission is an important measure of the stability of optical networks. index. In order to improve the reliability of optical network service transmission, the shared network (Mesh) protection technology is widely adopted.

One of the most distinctive protection and recovery mechanisms in the Networked Automatically Switched Optical Network (ASON)/Generalized Multi-Protocol Label Switching (GMPLS) network. The principle is to configure a Label Switched Path (LSP) for the service. The resources on the standby LSP are reserved by the signaling message, but the crossover is not established, and the resources are not actually used. After the primary LSP fails, the service first node initiates the activation of the backup LSP through the signaling message, and establishes the intersection reserved by the nodes on the standby LSP, so that the end-to-end path is opened, and the traffic is switched to the activated standby LSP. The business was restored.

The existing technical solution is that when the service primary LSP fails, the service first node initiates activation of the backup LSP resource by using a signaling message. In this process, the signaling message carried is the same as the signaling message carried in dynamic rerouting. The message contains many redundant objects, resulting in a relatively large message packet, prolonging the processing time and signaling messages of the signaling node. The transmission time, which in some cases leads to the deterioration of the service recovery performance, especially the recovery performance when the bulk service fails. Summary of the invention

The embodiment of the invention provides a method, a device and a system for activating a standby LSP, which can reduce the activation time of the standby LSP and improve the recovery performance when the service is faulty.

An alternate label switching path LSP activation method includes:

The first message is received by the node, and the first message includes first identifier information of the standby LSP.

The local node searches for a path corresponding to the backup LSP according to the first identifier information of the standby LSP, and obtains a local cross corresponding to the standby LSP according to the PSB, and activates the local cross.

If the local node is the last node, after the local cross-activation is successful, the second message is sent to the upstream node, where the second message includes the second identifier information of the standby LSP;

If the local node is an intermediate node, sending the first message to the downstream node, receiving the second message from the downstream node, and sending the second message to the upstream node after the local cross-activation is successful. Message.

An alternate label switching path LSP activation method includes:

The first node changes the protection status of the standby LSP in the path state control block PSB corresponding to the standby LSP from the standby to the primary, and activates the local cross corresponding to the standby LSP;

The first node sends a first message to the downstream node, where the first message includes first identifier information of the standby LSP;

The first node receives the second message from the downstream node, where the second message includes the second identifier information of the backup LSP, and searches for the PSB corresponding to the backup LSP according to the second identifier information of the backup LSP. The PSB obtains a local crossover corresponding to the backup LSP. If the local crossover is in an active state, the local cross-activation is successful, and the backup LSP is successfully activated.

An alternate label switching path LSP activation device, including:

a receiving unit, configured to receive a first message from an upstream node, where the first message includes first identifier information of the backup LSP; An activation unit, configured to search, according to the first identifier information of the backup LSP, a path state control block PSB corresponding to the backup LSP, and change a protection state of the backup LSP in the PSB from an standby to a primary use, according to the The PSB obtains a local cross corresponding to the backup LSP, and activates the local cross. The sending unit is configured to: if the local node is a last node, send a second message to the upstream node after the local cross activation succeeds. The second message includes the second identifier information of the backup LSP; if the local node is an intermediate node, sending the first message to the downstream node, and receiving the second message from the downstream node, where the local message is After the cross activation is successful, the second message is sent to the upstream node.

An alternate label switching path LSP activation device, including:

An activation unit, configured to change a protection state of the standby LSP in the path state control block PSB corresponding to the standby LSP from standby to active, and activate a local cross corresponding to the standby LSP;

a sending unit, configured to send a first message to the downstream node, where the first message includes first identifier information of the standby LSP;

a receiving unit, configured to receive a second message from the downstream node, where the second message includes second identifier information of the backup LSP, and search for a PSB corresponding to the backup LSP according to the second identifier information of the backup LSP The local crossover corresponding to the backup LSP is obtained according to the PSB. If the local crossover is in an active state, the local cross-activation is successful, and the standby LSP is successfully activated.

An alternate label switching path LSP activation system, including:

a first node, configured to change a protection status of the backup LSP in the path state control block PSB corresponding to the backup LSP from a standby to a primary use, activate a local cross corresponding to the backup LSP, and send a first message to the downstream node, The first message includes first identifier information of the backup LSP; receiving a second message from the downstream node, where the second message includes second identifier information of the backup LSP, if the local cross-activation is successful , the backup LSP is activated successfully;

a last node, configured to receive a first message from the upstream node, where the first message includes first identifier information of the backup LSP, and finds a path state control corresponding to the backup LSP according to the first identifier information of the backup LSP Block PSB, the protection status of the backup LSP in the PSB is changed from standby Changing to the primary use, obtaining the local crossover corresponding to the backup LSP according to the PSB, and activating the local cross; after the local cross-activation is successful, sending a second message to the upstream node, where the second message includes The second identification information of the backup LSP.

The embodiment of the present invention receives the first message from the upstream node, where the first message includes the first identifier information of the backup LSP, and searches for the path state control corresponding to the backup LSP according to the first identifier information of the backup LSP. a block PSB, the protection status of the backup LSP in the PSB is changed from the standby to the primary use, and the local cross corresponding to the backup LSP is obtained according to the PSB, and the local cross is activated, if the local node is the last node, After the local cross-activation is successful, sending a second message to the upstream node, where the second message includes second identifier information of the backup LSP, and if the local node is an intermediate node, sending the first node to the downstream node. a message, receiving the second message from the downstream node, and sending the second message to the upstream node after the local cross-activation is successful. The first message includes the first identifier information of the backup LSP, and the PSB corresponding to the backup LSP is searched according to the first identifier information of the backup LSP, so the first message does not need to carry the PSB information, and the PSB is obtained according to the PSB. The local LSP corresponding to the backup LSP does not need to carry the local cross-over information corresponding to the backup LSP. Therefore, the packet of the first message is smaller than the signaling packet carried in the dynamic re-routing, and the transmission time of the message can be reduced. And the processing time of the message to improve the recovery performance of the business. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description For some embodiments of the present invention, other drawings may be obtained from those skilled in the art without departing from the drawings.

1 is a flowchart of a method for activating an alternate LSP according to an embodiment of the present invention;

2 is a flowchart of another method for activating a backup LSP according to an embodiment of the present invention; FIG. 3 is a flowchart of another method for activating a backup LSP according to an embodiment of the present invention; 4 is a flowchart of a method for activating a standby LSP according to an embodiment of the present invention; FIG. 5 is a structural diagram of an apparatus for activating an alternate LSP according to an embodiment of the present invention;

FIG. 6 is a structural diagram of another activation apparatus of a standby LSP according to an embodiment of the present invention; FIG. 7 is a structural diagram of an activation system of a standby LSP according to an embodiment of the present invention;

FIG. 8 is a structural diagram of another activation system of a standby LSP according to an embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The size of the signaling message packet carried in dynamic rerouting is generally more than 300 bytes. The communication bandwidth of a typical control channel is 576 kb/s (72 KB/s), so that a signaling message packet is transmitted between two points. The time t is approximately 4.2 ms. The processing time p of a signaling packet at the node is related to the CPU capability, typically 2-4ms. Suppose there are 64 services that fail at the same time and start recovery. In this process, there are Max[t,p]*64=4*64=256ms for the transmission and processing of signaling message packets. The other time is mainly Cross build time. The cross-establishment time depends on the efficiency of the network element cross-over algorithm and the hardware cross-switching performance. The typical 64 traffic rerouting time is 550ms, while the signaling packet transmission and processing time accounts for nearly 50%.

The message packet in the embodiment of the present invention includes the identifier information of the backup LSP, and the PSB corresponding to the backup LSP is searched according to the identifier information of the backup LSP, and the message packet does not need to carry the PSB information, and the local cross corresponding to the backup LSP is obtained according to the PSB. Therefore, the message packet does not need to carry the local cross information corresponding to the backup LSP. Therefore, the message packet of the first message is smaller than the signaling message packet carried in the dynamic rerouting, which can reduce the transmission time of the message and the processing time of the message, and improve the service. Restore performance.

As shown in FIG. 1 , an embodiment of the present invention provides a method for activating an alternate LSP, including:

S101. The local node receives a first message from an upstream node, where the first message includes the standby Using the first identification information of the LSP;

5102. The node searches for a path state control block (PSB) corresponding to the backup LSP according to the first identifier information of the backup LSP, and changes the protection state of the standby LSP in the PSB from standby to the primary And obtaining, according to the PSB, a local cross corresponding to the backup LSP, and activating the local cross;

5103, if the local node is a last node, after the local cross-activation is successful, sending a second message to the upstream node, where the second message includes second identifier information of the backup LSP; And sending, by the node, the first message to the downstream node, and receiving the second message from the downstream node, and sending the second message to the upstream node after the local cross-activation is successful.

The first identifier information includes the source address of the standby LSP, the address of the sink node, the tunnel identifier, and the LSP identifier.

The second identifier information includes the backup LSP source node address, a sink node address, a tunnel identifier, and an LSP identifier. Specifically include:

The S bit in the protection PROTECTION object in the PSB is set to 0, thereby changing the protection status of the standby LSP from standby to active.

The receiving, by the S103, the second message from the downstream node, after the local cross-activation is successful, sending the second message to the upstream node may specifically include:

Searching, according to the second identifier information of the backup LSP, a PSB corresponding to the backup LSP, obtaining a local cross corresponding to the backup LSP according to the PSB, and sending the local node to the upstream node if the local crossover is in an active state Said the second message.

The receiving, by the S103, the second message from the downstream node, after the local cross-activation is successful, sending the second message to the upstream node specifically includes:

Searching, according to the second identifier information of the backup LSP, a PSB corresponding to the backup LSP, according to the The PSB obtains a local crossover corresponding to the backup LSP, and if the local crossover is in an inactive state, sends the second message to the upstream node when the local crossover is in an active state.

In the embodiment of the present invention, the first message includes the first identifier information of the backup LSP, and the PSB corresponding to the backup LSP is searched according to the first identifier information of the standby LSP, so the first message does not need to carry the PSB information, according to the first message. The PSB obtains the local crossover corresponding to the backup LSP, so the first message does not need to carry the local cross information corresponding to the backup LSP, so the message packet of the first message is smaller than the signaling message packet carried in the dynamic rerouting. It can reduce the transmission time of messages and the processing time of messages, and improve the recovery performance of services.

As shown in FIG. 2, an embodiment of the present invention provides another method for activating an alternate LSP, including:

S201, the first node changes the protection status of the standby LSP in the path state control block PSB corresponding to the standby LSP from the standby to the primary, and activates the local cross corresponding to the standby LSP.

S202, the first node sends a first message to the downstream node, where the first message includes first identifier information of the standby LSP.

S203: The first node receives the second message from the downstream node, where the second message includes the second identifier information of the backup LSP, and searches for the PSB corresponding to the backup LSP according to the second identifier information of the backup LSP. The local crossover corresponding to the backup LSP is obtained according to the PSB. If the local crossover is in an active state, the local cross-activation is successful, and the backup LSP is successfully activated.

In the embodiment of the present invention, the second message includes the second identifier information of the backup LSP, and the PSB corresponding to the backup LSP is searched according to the second identifier information of the backup LSP, so the second message does not need to carry the PSB information, according to the second message. The PSB obtains the local crossover corresponding to the backup LSP, so the second message does not need to carry the local cross information corresponding to the backup LSP, so the message packet of the second message is smaller than the signaling message packet carried in the dynamic rerouting. It can reduce the transmission time of messages and the processing time of messages, and improve the recovery performance of services.

As shown in FIG. 3, the embodiment of the present invention provides another method for activating an alternate LSP. In this embodiment, the first node is connected to the last node, and there is no intermediate node. The method includes:

S301. The first node sends the backup LSP in the path state control block PSB corresponding to the backup LSP. The protection status is changed from the standby change to the primary use, and the local cross corresponding to the backup LSP is activated; the first message is sent to the last node, where the first message includes the first identification information of the backup LSP;

S302: The last node receives the first message from the first node, where the first message includes the first identifier information of the backup LSP, and searches for the path state control block corresponding to the backup LSP according to the first identifier information of the standby LSP. The PSB, the protection status of the backup LSP in the PSB is changed from the standby to the primary use, and the local cross corresponding to the backup LSP is obtained according to the PSB, and the local cross is activated, and after the local cross activation succeeds, the first The node sends a second message, where the second message includes second identifier information of the backup LSP;

S303, the first node receives the second message from the last node, where the second message includes the second identifier information of the backup LSP, and searches for the PSB corresponding to the backup LSP according to the second identifier information of the backup LSP. The PSB obtains a local crossover corresponding to the backup LSP. If the local crossover is in an active state, the local cross-activation is successful, and the backup LSP is successfully activated.

In this embodiment, the first message includes the first identifier information of the backup LSP, and the PSB corresponding to the backup LSP is searched according to the first identifier information of the backup LSP, so the first message does not need to carry the PSB information. The PSB obtains the local crossover corresponding to the backup LSP. Therefore, the first message does not need to carry the local cross information corresponding to the backup LSP. Therefore, the message packet of the first message is smaller than the signaling message packet carried in the dynamic rerouting. Reduce the transmission time of messages and the processing time of messages, and improve the recovery performance of services.

As shown in FIG. 4, an embodiment of the present invention provides another method for activating an alternate LSP. In this embodiment, an intermediate node is included between a first node and a last node, and the method includes:

S401. The first node changes the protection status of the backup LSP in the path state control block PSB corresponding to the backup LSP from the standby to the primary, activates the local cross corresponding to the backup LSP, and sends a first message to the downstream node, where the first message includes the standby. First identification information of the LSP;

After the primary and backup LSPs of the shared Mesh recovery service are created, the primary LSP that interrupts the shared Mesh recovery service is interrupted in the network. The fault detection node sends the resource reservation protocol to the service head node. , RSVP) Notify message. After receiving the Notify message, the first node determines that the service type is the shared Mesh recovery service, and then switches to the primary service, and starts to activate the crossover of the local reservation state corresponding to the backup LSP, and simultaneously to the downstream node of the local node on the standby LSP. Send a Path' message. The Path' message is a new type of RSVP message. The message contains only the LSP identifier object.

5402, the intermediate node receives the first message from the upstream node, and searches for the path state control block PSB corresponding to the backup LSP according to the first identifier information of the standby LSP, and changes the protection state of the standby LSP in the PSB from the standby to the primary use. Obtaining a local cross corresponding to the backup LSP according to the PSB, activating the local cross, and sending the first message to a downstream node thereof;

After receiving the Path' message, the intermediate node parses the identification information of the standby LSP from the message, searches for the local PSB corresponding to the LSP, and then changes the LSP protection status in the PSB from the standby to the primary use, and starts to activate the backup LSP. The local reservation state is crossed, and the node continues to send a Path message to the downstream node of the standby LSP.

S403, the last node receives the first message from the upstream node, and searches for the path state control block PSB corresponding to the backup LSP according to the first identifier information of the backup LSP, and the protection status of the backup LSP in the PSB is The standby change is used as the primary use, and the local cross corresponding to the backup LSP is obtained according to the PSB, and the local cross is activated. After the local cross activation succeeds, the second message is sent to the upstream node, where the second message includes Second identification information of the backup LSP;

After receiving the Path, the last node parses the identification information of the standby LSP from the message, finds the local PSB corresponding to the LSP, and then changes the LSP protection status in the PSB from the standby to the primary use, and starts to activate the backup LSP. The intersection of local reservation states. After the cross activation succeeds, the Resv, message is returned to the upstream node. Resv, the message is a new RSVP message type, and the message only contains the LSP identifier object.

S404: The intermediate node receives the second message from its downstream node, and after the local cross-activation is successful, sends the second message to its upstream node.

After receiving the Resv message, the intermediate node parses the identification information of the standby LSP from the message and searches for the RSB (Resv State Block) corresponding to the LSP. If the backup LSP If the intersection of the corresponding local reservation state has been successfully activated, the Resv message is continuously sent to the upstream node, otherwise the Resv message is sent to the upstream node after waiting for the cross-activation to succeed.

S405. The first node receives the second message from its downstream node, and if the local cross-activation is successful, the standby LSP is successfully activated.

After receiving the Resv message, the first node parses the identification information of the standby LSP from the message and searches for the local RSB corresponding to the LSP. If the crossover of the local reservation state corresponding to the standby LSP has been successfully activated, the end-to-end activation of the standby LSP is successful and the service recovery is complete.

The following provides an object structure for adding signaling messages Path' and Resv':

<Path' Message) ::= <Common Header) [<MESSAGE_ID>]

<LSP_PATH_ID>

<Resv' Message) ::= <Common Header) [<MESSAGE_ID>]

<LSP_PATH_ID> The object structure of LSP_PATH_ID is:

0 1 2 3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- +-+-+-+-+-+-+-+

Length | Class-Num | C_Type (1)

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- +-+-+-+-+-+-+-+

IPv4 tunnel sender address

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- +-+-+-+-+-+-+-+

IPv4 tunnel end point address

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- +-+-+-+-+-+-+-+

Tunnel ID | LSP ID

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- +-+-+-+-+-+-+-+

The IPv4 tunnel sender address is the LSP source IP address; the IPv4 tunnel end point address is the LSP sink IP address; the tunnel ID is the tunnel identifier; and the LSP ID is the LSP identifier.

This embodiment can improve service recovery performance, especially when bulk service recovery. PathVResv' The maximum message length = 8 + 12 + 16 = 36, the transmission time of the new signaling message packet (plus 20 bytes of the IP header) is about 0.8 ms. Since the new signaling message contains fewer objects, the node processing time is also reduced accordingly. According to the existing CPU capability estimation, the processing time will be less than 1 ms. In this way, the 64 service recovery times mentioned above can be reduced by 3*64=192ms, that is, from 550ms to 358ms. In fact, because the node processes the signaling packet less time, the node has more CPU resources to run the crossover algorithm faster, so the overall recovery time is reduced.

In this embodiment, the recovery performance of the mass shared MESH service can be greatly improved, and the service interruption time can be reduced. Try to meet the needs of operators for small-volume service 200ms recovery and high-volume 2s recovery. The technical solution of the embodiment adopts a method for extending the existing RSVP-TE signaling protocol, and seamlessly integrates with the existing signaling mechanism, and various exception handling mechanisms of the existing signaling are also completely inherited, so that the implementation cost of the method of the present invention is Also small.

As shown in FIG. 5, an embodiment of the present invention provides an activation apparatus 500 for a backup LSP, including: a receiving unit 501, configured to receive a first message from an upstream node, where the first message includes a An identification information;

The activation unit 502 is configured to search, according to the first identifier information of the backup LSP, a path state control block PSB corresponding to the backup LSP, and change the protection state of the backup LSP in the PSB from standby to active use. The PSB obtains a local cross corresponding to the backup LSP, and activates the local cross;

The sending unit 503 is configured to: if the local node is a last node, send a second message to the upstream node after the local cross-activation is successful, where the second message includes a second identification letter of the backup LSP If the local node is an intermediate node, sending the first message to the downstream node, receiving the second message from the downstream node, and after the local cross-activation is successful, sending the Second message.

If the node is an intermediate node, the sending unit 503 is configured to send the first message to the downstream node, receive the second message from the downstream node, and search for the second identifier information according to the second LSP. The PSB corresponding to the backup LSP is obtained according to the PSB, and if the local cross is in an active state, the second message is sent to the upstream node.

If the node is an intermediate node, the sending unit 503 is configured to send the first message to the downstream node, receive the second message from the downstream node, and search for the second identifier information according to the second LSP. Determining a PSB corresponding to the backup LSP, obtaining a local cross corresponding to the backup LSP according to the PSB, and if the local crossover is in an inactive state, sending the first to the upstream node when the local crossover is in an active state Two messages.

As shown in FIG. 6, an embodiment of the present invention provides another activation device 600 for a standby LSP, including:

The activation unit 601 is configured to: change a protection status of the backup LSP in the path state control block PSB corresponding to the backup LSP from a standby to a primary, and activate a local cross corresponding to the backup LSP; The downstream node sends a first message, where the first message includes first identifier information of the backup LSP;

The receiving unit 603 is configured to receive a second message from the downstream node, where the second message includes second identifier information of the backup LSP, and the second identifier information of the backup LSP is used to search for the The PSB corresponding to the backup LSP obtains a local crossover corresponding to the backup LSP according to the PSB. If the local crossover is in an active state, the local cross-activation is successful, and the standby LSP is successfully activated.

As shown in FIG. 7, an embodiment of the present invention provides an activation system for a standby LSP, including a first node and a last node. There is no intermediate node between the first node and the last node, and the system includes:

The first node 701 is configured to change the protection status of the backup LSP in the path state control block PSB corresponding to the backup LSP from the standby to the primary, activate the local cross corresponding to the backup LSP, and send the first message to the downstream node. The first message includes first identifier information of the backup LSP; receiving a second message from the downstream node, where the second message includes second identifier information of the backup LSP, if the local cross-active If the success is successful, the backup LSP is successfully activated.

The last node 702 is configured to receive a first message from the upstream node, where the first message includes first identifier information of the backup LSP, and finds a path state corresponding to the backup LSP according to the first identifier information of the backup LSP. Controlling the PSB, changing the protection status of the backup LSP in the PSB from the standby to the primary use, obtaining the local cross corresponding to the backup LSP according to the PSB, and activating the local cross; the local cross activation succeeds And sending a second message to the upstream node, where the second message includes second identifier information of the backup LSP.

In the embodiment of the present invention, the first message includes the first identifier information of the backup LSP, and the PSB corresponding to the backup LSP is searched according to the first identifier information of the standby LSP, so the first message does not need to carry the PSB information, according to the first message. The PSB obtains the local crossover corresponding to the backup LSP, so the first message does not need to carry the local cross information corresponding to the backup LSP, so the message packet of the first message is smaller than the signaling message packet carried in the dynamic rerouting. Can reduce the transmission time of messages and the processing time of messages Improve business recovery performance.

As shown in FIG. 8, an embodiment of the present invention provides an activation system for a standby LSP, including a first node and a last node, and an intermediate node between the first node and the last node, the system includes:

The first node 801 is configured to change the protection status of the backup LSP in the path state control block PSB corresponding to the backup LSP from the standby to the primary, activate the local cross corresponding to the backup LSP, and send the first message to the downstream node. The first message includes first identifier information of the backup LSP; receiving a second message from the downstream node, where the second message includes second identifier information of the backup LSP, if the local cross-active If the success is successful, the backup LSP is successfully activated.

The intermediate node 803 is configured to receive the first message from the upstream node, and search for a path state control block PSB corresponding to the backup LSP according to the first identifier information of the backup LSP, where the backup LSP in the PSB is The protection status is changed from the standby to the primary, the local cross corresponding to the backup LSP is obtained according to the PSB, the local cross is activated, the first message is sent to the downstream node, and the second message from the downstream node is received. After the local cross activation is successful, the second message is sent to the upstream node.

The last node 802 is configured to receive a first message from the upstream node, where the first message includes the first identifier information of the backup LSP, and finds a path state corresponding to the backup LSP according to the first identifier information of the backup LSP. Controlling the PSB, changing the protection status of the backup LSP in the PSB from the standby to the primary use, obtaining the local cross corresponding to the backup LSP according to the PSB, and activating the local cross; the local cross activation succeeds And sending a second message to the upstream node, where the second message includes second identifier information of the backup LSP.

In the embodiment of the present invention, the first message includes the first identifier information of the backup LSP, and the PSB corresponding to the backup LSP is searched according to the first identifier information of the standby LSP, so the first message does not need to carry the PSB information, according to the first message. The PSB obtains the local crossover corresponding to the backup LSP, so the first message does not need to carry the local cross information corresponding to the backup LSP, so the message packet of the first message is smaller than the signaling message packet carried in the dynamic rerouting. It can reduce the transmission time of messages and the processing time of messages, and improve the recovery performance of services. The device embodiments and system embodiments described above are merely illustrative, and the components may or may not be physical components, that is, may be located in one place, or may be distributed to multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without deliberate labor.

Through the description of the above embodiments, those skilled in the art can clearly understand that the embodiments can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware. Based on such understanding, the above-described technical solutions may be embodied in the form of software products in essence or in the form of software products, which may be stored in a computer readable storage medium such as ROM/RAM, magnetic Discs, optical discs, etc., include instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments or portions of the embodiments.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Claim

An alternate label switching path LSP activation method, which is characterized by:

The local node receives a first message from an upstream node, where the first message includes first identifier information of the standby LSP;

The node searches for the path state control block PSB corresponding to the backup LSP according to the first identifier information of the standby LSP, and changes the protection state of the standby LSP in the PSB from the standby to the primary use, according to the PSB. Decoding a local cross corresponding to the backup LSP, and activating the local cross;

If the local node is the last node, after the local cross-activation is successful, the second message is sent to the upstream node, where the second message includes the second identifier information of the standby LSP.

2. The method according to claim 1, comprising:

The first identifier information includes the backup LSP source node address, a sink node address, a tunnel identifier, and an LSP identifier.

The second identifier information includes the backup LSP source node address, a sink node address, a tunnel identifier, and an LSP identifier.

The method according to claim 1, wherein the changing the protection status of the standby LSP in the PSB from standby to active comprises:

The S bit in the protection PROTECTION object in the PSB is set to 0, thereby changing the protection state of the standby LSP from standby to active.

The method according to claim 1, wherein the receiving the second message from the downstream node, after the local cross-activation is successful, sending the second message to the upstream node Specifically include:

Searching, according to the second identifier information of the backup LSP, a PSB corresponding to the backup LSP, obtaining a local cross corresponding to the backup LSP according to the PSB, and if the local crossover is an active state, The tour node sends the second message.

And searching for the PSB corresponding to the backup LSP according to the second identifier information of the backup LSP, obtaining a local cross corresponding to the backup LSP according to the PSB, and waiting for the local crossover if the local crossover is inactive The second message is sent to the upstream node when the state is active.

The first node receives the second message from the downstream node, and the second message includes the second identifier information of the backup LSP, and searches for the PSB corresponding to the backup LSP according to the second identifier information of the backup LSP. The PSB obtains a local crossover corresponding to the backup LSP. If the local crossover is in an active state, the local cross-activation is successful, and the backup LSP is successfully activated.

7. An apparatus for activating an alternate label switching path LSP, comprising:

a receiving unit, configured to receive a first message from an upstream node, where the first message includes first identifier information of the standby LSP;

An activation unit, configured to search, according to the first identifier information of the backup LSP, a path state control block PSB corresponding to the backup LSP, and change a protection state of the backup LSP in the PSB from an alternate to a primary use, according to the The PSB obtains a local cross corresponding to the backup LSP, and activates the local cross;

a sending unit, configured to: if the local node is a last node, send a second message to the upstream node after the local cross-activation is successful, where the second message includes second identifier information of the backup LSP; The node is an intermediate node, and the first message is sent to the downstream node, and the second message from the downstream node is received, and after the local cross activation succeeds, the second node is sent to the upstream node. Message.

The device according to claim 7, wherein if the local node is an intermediate node, the sending unit is configured to send the first message to a downstream node, and receive the second message from the downstream node. a message, searching for a PSB corresponding to the backup LSP according to the second identifier information of the backup LSP, obtaining a local cross corresponding to the backup LSP according to the PSB, and if the local crossover is an active state, reporting to the upstream node Sending the second message.

The device according to claim 7, wherein if the local node is an intermediate node, the sending unit is configured to send the first message to a downstream node, and receive the second message from the downstream node. a message, searching for a PSB corresponding to the backup LSP according to the second identifier information of the backup LSP, obtaining a local cross corresponding to the backup LSP according to the PSB, and waiting for the local local if the local crossover is inactive The second message is sent to the upstream node when the cross is active.

An apparatus for activating an alternate label switching path LSP, comprising: an activation unit, configured to change a protection status of the standby LSP in a path state control block PSB corresponding to the backup LSP from standby to active use Activating a local cross corresponding to the backup LSP;

An active label switching path LSP activation system, comprising: a first node, configured to change a protection status of the backup LSP in a path state control block PSB corresponding to the backup LSP from standby to primary use And activating a local message corresponding to the backup LSP, sending a first message to the downstream node, where the first message includes first identifier information of the backup LSP, and receiving a second message from the downstream node, where the second message The message includes the second identifier information of the backup LSP, and if the local cross-activation is successful, the backup LSP is successfully activated; a last node, configured to receive a first message from an upstream node, where the first message includes the standby

The first identifier information of the LSP is used to search for the path state control block PSB corresponding to the backup LSP according to the first identifier information of the backup LSP, and change the protection state of the standby LSP in the PSB from standby to active use, according to And obtaining, by the PSB, a local cross corresponding to the backup LSP, and activating the local cross; after the local cross-activation is successful, sending a second message to the upstream node, where the second message includes the Two identification information.

12. The system according to claim 12, wherein the downstream node of the head node is the end node.

The system according to claim 12, wherein the first node and the last node further comprise an intermediate node;

The intermediate node is configured to receive the first message from the upstream node, search for a path state control block PSB corresponding to the backup LSP according to the first identifier information of the backup LSP, and use the backup LSP in the PSB. The protection status is changed from the standby to the primary, the local cross corresponding to the backup LSP is obtained according to the PSB, the local cross is activated, the first message is sent to the downstream node, and the second message is received from the downstream node. After the local cross activation is successful, sending the second message to the upstream node.