Method and apparatus for protection switching

摘要

An apparatus and method for protection switching are disclosed. The protection switching method in accordance with an example of the present disclosure is capable of smoothly processing a protection switching while preventing a data path mismatch occurring in the protection switching in a case in which a forced switching command (FS), which is a passive command, and a signal failure (SF) of a protection path occur at both end nodes, respectively, when a linear protection switching is performed by use of a protection state coordination message in a packet network or a packet transport network.

主权项

1. A linear protection switching method of nodes in a MPLS (Multi Protocol Label Switching)-TP (Transport Protocol) network, comprising:
converting a state of a node to a remote state in response to a message received from a far-end node; upon detection of a new local request by the node in the remote state, transmitting a protection state coordination (PSC) message containing request information, traffic data path information and fault path information and indicating a local fault condition and a request state to the far-end node according to a priority of the new local request, and transmitting/receiving traffic through a protection or working data path; upon detection of a local request having a highest priority, converting a state of the node to a local state; and upon detection of a new remote request by the node in the local state, transmitting a PSC message containing request information, traffic data path information and fault path information and indicating a local fault condition and a request state to the far-end node according to the priority of the new remote request, and transmitting/receiving traffic through a data path matched with the data path of the far-end node according to the traffic data path information.