WO2014094575A1

WO2014094575A1 - Cross-domain path state negotiation method and node device

Info

Publication number: WO2014094575A1
Application number: PCT/CN2013/089422
Authority: WO
Inventors: 刘国满; 胡茂庐; 罗彬�
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-12-20
Filing date: 2013-12-13
Publication date: 2014-06-26
Also published as: CN103888280A; CN103888280B

Abstract

Disclosed are a cross-domain path state negotiation method and device. The method comprises: a cross-domain backup interconnection node on a protection path across two adjacent domains determining a local path state according to a path state detected by this node and/or path state information sent by an end node of the protection path on the two adjacent domains, the path state information sent by the end node indicating the current path state detected by the present end node; and the cross-domain backup interconnection node sending the path state information indicating the local path state to the end node based on the local path state. The node device comprises: a local path state determination module and a sending module.

Description

Cross-domain path state negotiation method and node device

Technical field

The present invention relates to the field of communications, and in particular, to a cross-domain path state negotiation method and a node device.

Background technique

Currently, in the ITU-T (International Telecommunication Union Telecommunication Standardization Organization) protection interworking standard, it is being discussed that when an interconnect node fails, it switches to the corresponding protection path for service transmission. As shown in Figure 1, domain 1 includes nodes A, B, and C. Domain 2 includes nodes B, C, and D. Domain 1 and domain 2 are adjacent domains, and nodes B and C are interconnected nodes across domains. The solid line between the nodes in Figure 1 is the working path, and the dotted line between the nodes is the protection path. Under normal circumstances, the service (thick solid line in the figure) selects the cross-domain working path ABD to transmit; when the cross-domain interconnection node B fails, both nodes A and D switch to the protection path ACD to send and receive services, as shown in Figure 2. . If the protection path CD also fails during the protection path ACD transmission and reception, node A in domain 1 cannot know that the CD link is faulty, and for node D, because it detects the CD link failure. Then, the original working path ABD transmission and reception service is still selected, as shown in FIG. 3, so that the path selection inconsistency between the nodes at both ends of the cross-domain path occurs.

Summary of the invention

The embodiment of the invention provides a cross-domain path state negotiation method and device, which avoids the situation that the path selection of the nodes at both ends of the cross-domain path is inconsistent.

The embodiment of the invention provides a cross-domain path state negotiation method, including:

The cross-domain backup interconnection node on the protection path across the adjacent two domains determines the local path state according to the path state detected by the local node and/or the path state information sent by the end node of the protection path on the adjacent two domains. The path state information sent by the end node indicates a path state detected by the current end node;

Transmitting the inter-domain backup interconnect node to the end node based on the local path status to indicate the local Path status information of the ground path status.

The path state information sent by the end node and the path state information sent by the cross-domain backup interconnect node are all carried in the state negotiation message.

The cross-domain backup interconnection node determines the local path status according to the path status detected by the local node and/or the path status information sent by the end node, and includes: the cross-domain backup interconnection node according to the path status detected by the node and/ Or the path state information sent by the end node, and the path state with the highest priority is selected as the local path state.

The cross-domain backup interconnection node selects the path state with the highest priority as the local path state according to the path state detected by the node and/or the path state information sent by the end node, and includes: the cross-domain backup interconnection node according to the present The path state detected by the node and the path state information sent by one or two end nodes indicating the path state detected by the current end node, and selecting the path state with the highest priority as the local path state; or

The cross-domain backup interconnection node selects the path state with the highest priority as the local path state according to the path state detected by the node; or

The cross-domain backup interconnection node selects the path state with the highest priority as the local path state according to the path state information sent by one or two end nodes indicating the path state detected by the current end node.

The cross-domain backup interconnection node sends the path state information indicating the local path state to the end node based on the local path status, including:

The cross-domain backup interconnection node determines that if the path state priority of the cross-domain backup interconnection node is lower than or equal to the priority of the end node path state, sending no-request (NR) status information to the end node, and determining if The priority of the path state of the cross-domain backup interconnect node is higher than the priority of the end node path state, and information indicating the state of the local path of the cross-domain backup interconnect node is sent to the end node.

And sending, by the cross-domain backup interconnection node, the path state information indicating the local path state to the end node according to the local path state, including: sending, to the end node, information indicating a local path state of the cross-domain backup interconnection node.

The method further includes: the service receiving, in the process of transmitting the cross-domain protection path, the end node receiving station The path state information of the local path state sent by the cross-domain backup interconnect node is compared, the local path state of the cross-domain backup interconnect node and the path state of the local end point are compared, and the state with higher priority is selected to perform the operation. .

The operation includes any one of the following operations: no switching, switching, and failback.

The embodiment of the present invention further provides a node device for implementing cross-domain path state negotiation, where the node device is an inter-domain backup interconnection node located on a protection path across two adjacent domains, and the node device includes: a local path state Determining the module and sending module, where:

The local path state determining module is configured to determine a local path state according to a path state detected by the node and/or path state information sent by the end node of the protection path on the adjacent two domains, where the end The path status information sent by the node indicates the path status detected by the current end node;

The sending module is configured to send the path state information indicating the local path state to the end node based on the local path state determined by the local path state determining module.

The node device further includes a receiving module, and the receiving module is configured to receive the path information indicating that the protection path has a path status detected by the current end node;

The sending module is further configured to send path state information indicating the state of the local path to the end node by using a state negotiation message.

The local path state determining module determines the local path state according to the path state detected by the local node and/or the path state information sent by the end node, and the method includes: the local path state determining module according to the path state detected by the node and/or Or the path state information sent by the end node, and the path state with the highest priority is selected as the local path state.

The local path state determining module selects the path state with the highest priority as the local path state according to the path state detected by the node and/or the path state information sent by the end node, including:

The local path state determining module selects a priority according to the path state detected by the local node and the path state information sent by one or two end nodes indicating the path state detected by the current end node. The highest path state as the local path state; or

The local path state determining module selects the path state with the highest priority as the local path state according to the path state detected by the node; or

The local path state determining module selects the path state with the highest priority as the local path state according to the path state information indicating the path state of the current end node detection sent by one or two end nodes.

The sending module sends the path state information indicating the local path state to the end node based on the local path state, where the sending module determines that the path state priority of the cross-domain backup interconnect node is lower than or equal to the end node. The priority of the path state is sent to the end node without request (NR) status information, and it is determined that if the path state priority of the cross-domain backup interconnect node is higher than the priority of the end node path state, then the end node is sent to the end node. Sending information indicating the status of the local path of the cross-domain backup interconnect node.

The sending module sends the path state information indicating the local path state to the end node based on the local path state, and the sending module sends the information indicating the local path state of the cross-domain backup interconnect node to the end node.

In the embodiment of the present invention, the inter-domain state negotiation is performed between the nodes, and after the cross-domain backup interconnection node detects and/or is notified of the link state of the two ends of the node, the state of the corresponding protection path in the adjacent domain is regarded as a local state. The input factor is used to advertise the status of the local link to other end nodes in the domain to ensure that the two ends of the inter-domain path switch to the same path to receive and send services, so as to ensure the consistency of cross-domain path selection, so that the cross-domain service can be Correct protection and recovery.

BRIEF abstract

FIG. 1 is a schematic diagram of service transmission when a related art is in a normal state;

2 is a schematic diagram of service transmission when a related art interconnection node fails;

FIG. 3 is a schematic diagram of inconsistency in service transmission in the related art;

4 is a flowchart of Embodiment 1 of the present invention;

Figure 5 is a flowchart of Embodiment 2 of the present invention; 6 is a schematic diagram of correct switching protection according to Embodiment 2 of the present invention;

FIG. 7 is a schematic structural diagram of a device module according to Embodiment 4 of the present invention.

Preferred embodiment of the invention

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

Example 1

This embodiment describes a cross-domain path state negotiation method. As shown in FIG. 4, the method includes the following steps: Step 101: A cross-domain backup interconnection node on a protection path across two adjacent domains according to a path state detected by the node and/or Or the path state information sent by the end node of the protection path on the adjacent two domains, determining a local path state, where the path state information sent by the end node indicates a path state detected by the current end node;

The path state information sent by the end node and the path state information sent by the cross-domain backup interconnect node are all carried in the state negotiation packet. The status negotiation packet can use the existing status negotiation mechanism, such as APS (Automatic Protection Switched) or PSC (Protected State Coordination).

The path status information is used to indicate whether the path has failed.

In an optional embodiment, the cross-domain backup interconnection node selects the path state with the highest priority as the local path state according to the path state detected by the node and/or the path state information sent by the end node, and specifically includes the following Happening:

(1) The cross-domain backup interconnection node selects the path state with the highest priority as the local path state according to the path state detected by the node and the path state information sent by one or two end nodes indicating the path state detected by the current end node; or

(2) The cross-domain backup interconnection node selects the path state with the highest priority as the local path state according to the path state detected by the node (including the paths in the adjacent two domains); or

(3) The cross-domain backup interconnection node selects the path state with the highest priority as the local path state according to the path state information sent by one or two end nodes indicating the path state detected by the current end node. Step 102: The cross-domain backup interconnection node sends path state information indicating the local path state to the end node according to the local path state.

The inter-AS backup interconnect node sends the path status information of the local node to the nodes at both ends of the cross-domain protection path, including the following two situations:

Case 1:

The cross-domain backup interconnect node directly sends information indicating the local path status of the cross-domain backup interconnect node to the end node; Case 2:

The cross-domain backup interconnection node determines, if the path state priority of the cross-domain backup interconnection node is lower than or equal to the priority of the end node path state, sending NR (None Request) status information to the end node, Determining, if the priority of the path state of the cross-domain backup interconnect node is higher than the priority of the end node path state, sending information indicating the state of the local path of the cross-domain backup interconnect node to the end node.

For the end node, in the case of the above-mentioned case 1 or case 2, in the above-mentioned cross-domain protection path transmission process, the end node receives the path state information indicating the local path state sent by the cross-domain backup interconnection node, and compares the cross-domain backup interconnection node. The priority of the local path state and the path state of the endpoint, and the state with the higher priority is selected to perform the operation. The above operations include any of the following operations: No switching, switching, and cutting back. Except for the operations listed here, the end nodes are not excluded from performing other operations. In addition, operations that are different from the above-described operation names but have the same actions are still within the scope of the present invention.

In this embodiment, the nodes at both ends of the inter-domain path select a unified path to perform the sending and receiving services, and ensure the consistency of the switching between the two ends of the inter-area protection path.

Example 2

This embodiment is an optional embodiment, and the method in the first embodiment is specifically described by taking the cross-domain backup interconnection node in combination with the path state detected by the local node and the path state of the end node, and the second case as an example.

First, a protection path is configured in each domain for the cross-domain working path. The protection paths in these domains are spliced together into one cross-domain protection path. Cross-domain association nodes on the protection path across adjacent domains are inter-domain Associated nodes. The cross-domain backup association node configures the association relationship of the protection path of the cross-domain protection path of the cross-domain backup association node in different domains. The method is as shown in FIG. 5, and includes:

Step 201: The two ends of the intra-domain path (the two end nodes of the protection path in the two adjacent domains of the protection path path) periodically detect the path status on the path in the domain, including whether a link failure occurs, and the path within the domain If the link is faulty, and the link fault occurs on the path in the domain, and the fault occurs on the interconnected node, go to step 202. If only the link fault occurs in the intra-domain path, or only the interconnected node fails, start intra-domain protection.

The intra-domain path described herein includes a working path and a protection path.

Intra-domain protection can be achieved by using relevant technical methods, and will not be repeated here.

Step 202: The two ends of the intra-domain path send the state negotiation packet to the inter-domain backup association node, where the packet carries the information about the path state detected by the nodes at both ends of the intra-domain path.

For any end node in the domain, the state information with the highest priority detected by the node is sent to the inter-domain backup interconnect node.

The nodes at both ends of the intra-domain path periodically send status negotiation packets to the inter-domain backup association node.

In this embodiment, the two ends are taken as an example. If one of the end nodes fails, only one end node may send a status negotiation message. An extreme case is that if both end nodes are faulty, the cross-domain backup association node will not receive the status negotiation message sent by the end node.

Step 203: After receiving the path state information sent by the nodes at both ends of the path in the domain, the inter-domain backup association node selects the path state with the highest priority as the path state of the node according to the path state detected by the node.

Specifically, when the backup interconnection node receives the state negotiation packet sent by the peer node in each domain, according to the link state on each domain and the state of the corresponding protection path in the adjacent domain, the state with the highest priority is selected as the local state. Path status. The corresponding protection path in the adjacent domain is a protection path with an association relationship.

In step 204, the cross-domain backup association node determines the path state priority of the node at both ends of the path in the domain and the path state priority of the local node respectively. If the path state priority of the node is higher than the path state priority of the remote node, step 205 is performed. The priority of the path state of the node is lower than or equal to the path state priority of the remote node, and step 206 is performed; Step 205, the information indicating the path status of the local node is sent to the corresponding remote node, step 207 is performed;

Step 206, sending NR status information to the corresponding remote node, and performing step 207;

In the above steps 205 and 206, the information indicating the path status of the node and the NR status information and the path status information indicating the local path status are all transmitted using the status negotiation message. In this embodiment, the negotiation is completed based on the APS negotiation mechanism.

In other alternative embodiments, step 204 and step 206 may also be omitted, and information indicating the status of the local path of the inter-domain backup interconnect node may be sent directly to the end node. Negotiation can now be completed based on the PSC negotiation mechanism.

Step 207: The two ends of the intra-domain path perform the operation according to the path status information sent by the inter-domain backup association node in combination with the path status detected by the local node. The above operations include any of the following operations: No switching, switching, and failback.

Specifically, when the peer node on the adjacent two domains receives the path state information sent by the cross-domain backup interconnect node, compares with the priority of the locally detected path state, and if the path state sent by the cross-domain backup interconnect node is If the priority of the path is greater than the priority of the locally detected path state, the path state of the inter-domain backup interconnect node is selected to perform the operation; otherwise, the operation is performed according to the locally detected path state. The destination path of the service switch depends on the determined state. For example, if the status indicates a work path failure, the service can be switched to the protection path, and the status indicates that the protection path is faulty, and the service can be switched back to the working path.

For the network shown in Figure 3, for the cross-domain working path ABD, configure a corresponding cross-domain protection path ACD, and bind the two intra-domain protection paths AC and CD on the cross-domain backup interconnection node C or Association. When the interconnected primary node B fails on the cross-domain working path, the cross-domain service protection is performed, and the service is switched to the cross-domain protection path of the working path, and the protection path CD in the cross-domain protection path domain 2 also fails. , the main process of protection and recovery of cross-domain services:

The nodes A and D of the cross-domain path perform the state detection of the path on the respective domain, and the end node selects the state with the highest priority as the local path state and sends the state to the peer node C of the intra-domain protection path according to the state result of the local detection; For the case shown in Figure 3, the interconnected Node B and the link CD are the same. In the event of a fault, node A detects SF-W (working path signal failure) in the working path, and for node D, SF (Signal Failure) information appears in both the working path and the protection path, due to SF- P (protection path signal failure) has higher priority than SF-W, then D will select the highest priority state SF-P to send to backup interconnect node C, and A will send SF-W state to C node; when backup interconnect node C After receiving the status negotiation message sent by the cross-domain end nodes A and D, the status of the protection path corresponding to the adjacent domain is also taken as an input factor, and then the state with the highest state priority is selected as the local path state. C, it detects that the protection path CD is faulty, and separately receives the SF-W sent by the node A and the SF-P sent by the node D, and selects the SF-P as the local path state;

The backup interconnect node C compares the local state priority with the state priority sent by the remote node. If the local path state priority is greater than the path state priority sent by the remote node, the local path state information is selected through the APS. Or the status negotiation message, such as the PSC, is sent to the corresponding remote node. Otherwise, the NR status information is advertised to the corresponding remote node. Since the path status of the node C is SF-P, the SF-P is sent to the SF-P. Node A, and sent to node D is NR status information;

After receiving the status negotiation message sent by the backup interconnection node C, the nodes A and D respectively compare the remote state priority (that is, the path state priority of the node C) with the locally detected status priority, for the node A. The local detection status is SF-W, and the node C sends the SF-P, so the node A selects the SF-P to perform the switchback operation, that is, the node A selects to switch to the working path due to the protection path failure; and for the node D, When the SF-P is detected locally, the C node sends the NR status information, so the node D also selects the SF-P to perform the switchback operation, and also chooses to switch to the working path. At this time, both node A and node D receive from the original working path. Or send the service, as shown in Figure 6, to ensure the consistency of the transmission path of the nodes at both ends.

It should be noted that the fault of the interconnected node B may only cause some services to be congested. Switching back to the working path may not cause all services to fail.

Example 3

This embodiment describes a node device implementing the method of Embodiment 1, the node including two adjacent As shown in FIG. 7, the node device includes a local path state determining module 301 and a sending module 302, where:

The local path state determining module 301 is configured to determine a local path state according to the path state detected by the local node and/or the path state information sent by the end node of the protection path on the adjacent two domains, where the end The path status information sent by the node indicates the path status detected by the current end node; the sending module 302 is configured to send the local path status determined by the local path status determining module 301 to the end node, and send the status indicating the local path status to the end node. Path status information.

In a preferred embodiment, the foregoing node device further includes a receiving module 303, where the status negotiation message carries the path status information indicating the path status detected by the current end node; the sending module is used to pass the status negotiation. The message sends path state information indicating the state of the local path to the end node.

In a preferred embodiment, the local path state determining module 301 selects the path state with the highest priority as the local path state according to the path state detected by the node and/or the path state information sent by the end node. This includes one of the following situations:

The local path state determining module 301 selects the path state with the highest priority as the local path state according to the path state detected by the node and the path state information sent by one or two end nodes indicating the path state detected by the current end node;

The local path state determining module 301 selects the path state with the highest priority as the local path state according to the path state detected by the node;

The local path state determining module 301 selects the path state with the highest priority as the local path state according to the path state information indicating the path state of the current end node detection sent by one or both end nodes.

In an optional embodiment, the transmitting module 302 can send path state information indicating the local path state to the end node in one of the following ways:

The sending module 302 determines that if the path state priority of the cross-domain backup interconnect node is lower than or equal to the priority of the end node path state, the NR state information is sent to the end node, and the path state of the cross-domain backup interconnect node is determined. Priority is higher than the priority of the end node path state, then Sending, by the end node, information indicating a local path status of the cross-domain backup interconnect node;

The sending module 302 sends information indicating the local path status of the cross-domain backup interconnect node to the end node.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program instructing the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

It is a matter of course that the invention may be embodied in various other forms and modifications without departing from the spirit and scope of the invention.

Industrial applicability

Claims

Claim

1. A cross-domain path state negotiation method, including:

The cross-domain backup interconnect node transmits path state information indicating the local path state to the end node based on the local path state.

2. The method of claim 1 wherein:

3. The method of claim 1 or 2, wherein:

The cross-domain backup interconnection node determines the local path status according to the path status detected by the node and/or the path status information sent by the end node, including:

The cross-domain backup interconnection node selects the path state with the highest priority as the local path state according to the path state detected by the node and/or the path state information sent by the end node.

4. The method of claim 3, wherein:

5. The method of claim 1 wherein:

6. The method of claim 1 wherein:

Send information indicating the status of the local path of the cross-domain backup interconnect node to the end node.

7. The method of claim 5 or 6, further comprising:

During the cross-domain protection path transmission process, the end node receives the path state information that is sent by the cross-domain backup interconnection node and indicates the state of the local path, and compares the local path state of the cross-domain backup interconnection node with the local end point. The priority of the path state, select the state with higher priority to perform the operation.

8. The method of claim 7 wherein:

A node device for implementing cross-domain path state negotiation, the node device being an inter-domain backup interconnection node located on a protection path across two adjacent domains, the node device comprising: a local path state determination module and a sending module , among them:

10. The node device of claim 9, wherein:

11. A node device according to claim 9 or 10, wherein:

The local path state determining module determines the local path state according to the path state detected by the local node and/or the path state information sent by the end node, including:

The local path state determining module selects the path state with the highest priority as the local path state according to the path state detected by the node and/or the path state information sent by the end node.

12. The node device of claim 11 wherein:

The local path state determining module selects the path state with the highest priority as the local path state according to the path state detected by the node and the path state information sent by one or two end nodes indicating the path state detected by the current end node; or

13. The node device of claim 9, wherein:

The sending module sends the path state information indicating the local path state to the end node based on the local path status, including:

The sending module determines that if the path state priority of the cross-domain backup interconnection node is lower than or equal to Sending no-request (NR) status information to the end node to determine the priority of the path state of the end node, and determining that if the path state priority of the cross-domain backup interconnect node is higher than the priority of the end node path state, The end node sends information indicating the status of the local path of the cross-domain backup interconnect node.

14. The node device of claim 9, wherein:

The sending module sends information indicating the local path status of the cross-domain backup interconnect node to the end node.