US 9,071,513 B2 · Path switch-back method and apparatus in transport network

Abstract

The disclosure discloses a path switch-back method and apparatus in a transport network, belongs to the field of communications, and is used for avoiding the problem that signals can not be switched back to a working path from a protection path when the links in two directions of the working path between nodes in the transport network are restored from fault simultaneously. The path switch-back method in a transport network provided by the disclosure includes: a local node determines two failed links on the working path between an opposite node and itself are restored to normal simultaneously (S101); the local node enters a Wait To Restore (WTR) state (S102); and the local node switches signals back to the working path when the WTR state ends (S103). The disclosure is used for realizing that signals are switched back to the working path from the protection path when the links in two directions of the working path between nodes in the transport network are restored from fault simultaneously.

Claims8

Dependent claims

A path switch-back method in a transport network, comprising:

determining, by a local node, that two failed links on a working path between an opposite node and itself are restored to normal simultaneously;
entering, by the local node, a Wait To Restore (WTR) state;
and
switching, by the local node, a signal back to the working path when the WTR state ends;
wherein the determining, by a local node, that two failed links on a working path between an opposite node and itself are restored to normal simultaneously comprises:
receiving, by the local node, a protection switching request sent by the opposite node and determining that the protection switching request is a Reverse Request (RR);
and
determining, by the local node that a latest protection switching request sent to the opposite node or a protection switching request which needs to be sent to the opposite node currently is also an RR.

5 more elements

A path switch-back apparatus in a transport network, comprising:

a memory storing programming instructions;
and
a processor configured to be capable of executing the stored programming instructions to perform steps comprising:
determining that two failed links on a working path between a local node and an opposite node are restored to normal simultaneously;
making the local node enter a WTR state;
and
switching a signal at the local note back to the working path when the WTR state ends;
wherein the step of determining that two failed links on a working path between a local node and an opposite node are restored to normal simultaneously comprises:
receiving, by the local node, a protection switching request sent by the opposite node and determining that the protection switching request is a Reverse Request (RR);
and
determining, by the local node that a latest protection switching request sent to the opposite node or a protection switching request which needs to be sent to the opposite node currently is also an RR.

8 more elements

Dependencies are inferred from the claim text.

Path switch-back method and apparatus in transport network

Life of this patent

Path switch-back method and apparatus in transport network

Life of this patent

Abstract

Claims8