Protection method and system for multi-domain network, and node

Patent metadata

Field	Value
Publication number	US-9806937-B2
Application number	US-201514982282-A
Country	US
Kind code	B2
Filing date	Dec 29, 2015
Priority date	Jun 29, 2013
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

In the field of network communications, a protection method for a multi-domain network includes: after a second node detects that a first link fails, disconnecting a first protection path on the node, connecting a first sub-path and a path that is within a second domain, uses the second node as an endpoint, and is used to bear a service; sending, on the first sub-path, a first failure monitoring message that carries first maintenance information to a third node, where the first maintenance information is the same as second maintenance information carried in a second failure monitoring message; the second failure monitoring message is a message that is sent on the first protection path by a first node to the third node and is used to monitor a failure of the first protection path.

First claim

What is claimed is:

1. A protection method for a multi-domain network, wherein the multi-domain network comprises a first domain and a second domain, wherein the first domain and the second domain intersect at a first node and a second node; and the method comprises:
after the second node detects that a first link fails, disconnecting a first protection path on the node, and connecting a first sub-path and a path that is within the second domain, uses the second node as an endpoint, and is used to bear a service; and sending, on the first sub-path, a first failure monitoring message that carries first maintenance information to a third node, wherein:
the first maintenance information is the same as second maintenance information carried in a second failure monitoring message; the second failure monitoring message is sent on the first protection path by the first node to the third node and is used to monitor a failure of the first protection path; the first link is a link between the first node and the second node; the service is a service that passes through the first domain and the second domain;
the first protection path is formed by splicing the first sub-path and a second sub-path and is a protection path of a first working path; the first working path is a working path of the service between the first node and the third node within the first domain; the first sub-path is a path between the second node and the third node; and the second sub-path is a path that passes through the first link and is between the first node and the second node.

2. The method according to claim 1 , wherein the disconnecting a first protection path on the node, and connecting a first sub-path and a path that is within the second domain, uses the second node as an endpoint, and is used to bear a service comprises:
disconnecting the first protection path and a second protection path on the node; and connecting the first sub-path and a third sub-path, wherein:
the second protection path is formed by splicing the third sub-path and a fourth sub-path and is a protection path of a second working path; the second working path is a working path of the service between the first node and a fourth node within the second domain; the third sub-path is a path between the second node and the fourth node; and the fourth sub-path is a path between the first node and the second node.

3. The method according to claim 1 , wherein the second maintenance information comprises an identifier of a maintenance entity group to which a maintenance endpoint of the first protection path belongs, a maintenance entity group endpoint identifier of a maintenance endpoint of the first protection path on the first node, and a maintenance entity group endpoint identifier of a maintenance endpoint of the first protection path on the third node.

4. The method according to claim 1 , wherein the second maintenance information comprises an identifier of a maintenance association to which a maintenance endpoint of the first protection path belongs, a maintenance association endpoint identifier of a maintenance endpoint of the first protection path on the first node, and a maintenance association endpoint identifier of a maintenance endpoint of the first protection path on the third node.

5. The method according to claim 1 , wherein the method further comprises:
before the second node detects that the first link fails, forwarding, by the second node, the received second failure monitoring message to the third node, and recording the second maintenance information carried in the received second failure monitoring message.

6. The method according to claim 1 , wherein the method further comprises:
before the second node detects that the first link fails, forwarding, by the second node, received second automatic protection switching information to the third node, wherein the second automatic protection switching information is information sent on the first protection path by the first node to the third node; and
after the second node detects that the first link fails, sending, on the first protection path, first automatic protection switching information to the third node.

7. The method according to claim 6 , wherein the method further comprises:
before the second node detects that the first link fails, forwarding, by the second node, a received third automatic protection switching message to the first node, and maintaining a protection switching state machine according to the third automatic protection switching message, wherein the third automatic protection switching message is information sent on the first protection path by the third node to the first node; and
after the second node detects that the first link fails, stopping, by the second node, forwarding the third automatic protection switching message.

8. The method according to claim 6 , wherein the method further comprises:
after the second node detects that the first link fails, when the third automatic protection switching information that is sent by the third node and requests switching to the first protection path is received, sending, by the second node, a notification message to the second domain, wherein the notification message is used to instruct that the second node is to be used to connect the first domain and the second domain.

9. The method according to claim 1 , wherein the method further comprises:
before the second node detects that the first link fails, forwarding, by the second node, a received third failure monitoring message to the first node, and monitoring a failure of the first sub-path according to the third failure monitoring message, wherein the third failure monitoring message is a message that is sent on the first protection path by the third node to the first node and is used to monitor the first protection path; and
after the second node detects that the first link fails, stopping, by the second node, forwarding the third failure monitoring message.

10. A node, comprising a detecting unit, a switching unit, and a processing unit, wherein:
the detecting unit is configured to detect a failure of a first link, wherein the first link is a link between a first node and the node;
the switching unit is configured to: after it is detected that the first link fails, disconnect a first protection path on the node, and connect a first sub-path and a path that is within a second domain, uses the node as an endpoint, and is used to bear a service, wherein:
the service is a service that passes through a first domain and the second domain; the first domain and the second domain intersect at the first node and the node; the first protection path is formed by splicing the first sub-path and a second sub-path and is a protection path of a first working path; the first working path is a working path of the service between the first node and a third node within the first domain; the first sub-path is a path between the node and the third node; and the second sub-path is a path that passes through the first link and is between the first node and the node; and
the processing unit is configured to: after it is detected that the first link fails, send, on the first sub-path, a first failure monitoring message that carries first maintenance information to the third node, wherein:
the first maintenance information is the same as second maintenance information carried in a second failure monitoring message; and the second failure monitoring message is a message that is sent on the first protection path by the first node to the third node and is used to monitor a failure of the first protection path.

11. The node according to claim 10 , wherein the switching unit is configured to: after it

Assignees

• Huawei Tech Co Ltd

Inventors

• Ye Min
• Long Hao

Classifications

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04L43/08

  Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters · CPC title

• H04L41/0654 Primary

  using network fault recovery (ring fault isolation or reconfiguration in loop networks without recovery actions by a network management system H04L12/437) · CPC title

• H04L12/6418 Primary

  Hybrid transport · CPC title