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

Patent metadata

Field	Value
Publication number	US-10164823-B2
Application number	US-201715783403-A
Country	US
Kind code	B2
Filing date	Oct 13, 2017
Priority date	Jun 29, 2013
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

In the field of network communications, a protection method for a multi-domain network, wherein the multi-domain network comprises a first domain and a second domain and the two domains are interconnected by node B and C, includes: after failure of a first link between the two nodes is detected, node C disconnects a first protection path with the first domain, connects a first sub-path of the first protection path and a path that is within a second domain to form a new protection path for bearing a service across the multi-domain network, and sending, on the first sub-path, a first failure monitoring message that carries first maintenance information to node A, 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 node B to node A and is used to monitor a failure of the first protection path.

First claim

What is claimed is:

1. A method of protection 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 are interconnected by a first node and a second node; and the method comprising:
detecting a failure of a first link between the first node and the second node, disconnecting, by the second node, a first protection path;
connecting, by the second node, a first sub-path of the first protection path and a path within the second domain to construct a new protection path to bear a service which passes through the first domain and the second domain; and
sending, by the second node, 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.

2. The method according to claim 1 , wherein the first 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.

3. The method according to claim 1 , wherein the first 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.

4. The method according to claim 1 , wherein the method further comprises:
before detecting the failure of the first link, 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.

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

6. The method according to claim 5 , wherein the method further comprises:
before detecting the failure of the first link, 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 sent on the first protection path by the third node to the first node; and
after detecting the failure of the first link, stopping, by the second node, forwarding the third automatic protection switching message.

7. The method according to claim 5 , wherein the method further comprises:
after detecting the failure of the first link, 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.

8. The method according to claim 1 , wherein the method further comprises:
before detecting the failure of the first link, 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 detecting the failure of the first link, stopping, by the second node, forwarding the third failure monitoring message.

9. An apparatus, comprising:
a switch configured to:
detect a failure of a first link between the first node and the second node, disconnect a first protection path; and
connect a first sub-path of the first protection path and a path that is within a second domain to construct a new protection path to bear a service passes through at least two domains; and

a transceiver configured to: send 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.

10. The apparatus according to claim 9 , wherein the switch comprises a first bridge, a first selector, and a controller, wherein:
an output end of the first selector is connected to the first sub-path; a first input end of the first selector is connected to the second sub-path;
a second input end of the first selector is connected to a second output end of the first bridge;
a first output end of the first bridge is connected to the fourth sub-path; an input end of the first bridge is connected to the third sub-path; and
the controller is configured to: after detecting the failure of the first link, control the input end of the first bridge to disconnect from the first output end of the first bridge and to connect to the second output end of the first bridge, and control the output end of the first selector to disconnect from the first input end of the first selector and to connect to the second input end of the first selector.

11. The apparatus according to claim 10 , wherein the switch further comprises a second bridge and a second selector, wherein:
an input end of the second bridge is connected to the first sub-path; a first output end of the second bridge is connected to the second sub-path;
a second output end of the second bridge is connected to a second input end of the second selector;
a first input end of the second selector is connected to the fourth sub-path; an output end of the second selector is connected to the third sub-path; and
the controller is further configured to: after the failure of the first link is detected, control the input end of the second bridge to disconnect from the first output end of the second bridge and to connect to the second output end of the second bridge, and control the output end of the second selector to disconnect from the first input end of the second selector and to connect to the second input end of the second selector.

12. The apparatus according to claim 9 , wherein the transceiver is further configured to: before detecting the failure of the first link, forward the received second failure monitoring message and second automatic protection switching information to the third node, wherein the second automatic protection switching information is sent on the first protection path by the first node to the third node; and after the failure of the first link is detected, send, on the first protection path, first automatic protection switching information to t

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

• 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

• H04L43/08

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

• H04L12/6418 Primary

  Hybrid transport · CPC title