Method, device, and system for establishing label switching path in fast rerouting switching

A method for establishing a label switching path (LSP) in fast rerouting (FRR) switching, the method comprising:

• receiving a first message sent by a point of local repair (PLR), wherein the first message carries information which is used to determine a time of holding a path refreshing state and hold the path refreshing state according to the determined time;
• determining the time of holding the path refreshing state according to the information carried in the first message;
• receiving a second message sent by the PLR in the determined time, wherein the second message carries information related to refreshing a path state;
• and
• establishing a local LSP according to the information related to refreshing the path state in the second message.

A network equipment, comprising:

• a first message receiving module, configured to receive a first message sent by a point of local repair (PLR), wherein the first message carries information which is used to determine a time of holding a path refreshing state and hold the path refreshing state according to the determined time;
• a second determination module, configured to determine a time of holding the path refreshing state according to the information carried in the first message received by the first message receiving module;
• a second message receiving module, configured to receive a second message sent by the PLR in the time of holding the path refreshing state determined by the second determination module, wherein the second message carries information related to refreshing a path state;
• and
• a second establishment module, configured to establish a local label switching path (LSP) according to the information related to refreshing the path state in the second message received by the second message receiving module.

A communication system, comprising:

• a first network equipment, configured to send a first message to a second network equipment on a label switching path (LSP), wherein the first message carries information which is used to make the second network equipment to determine a time of holding a path refreshing state and hold the path refreshing state according to the determined time;
• and send a second message to the second network equipment in the time of holding the path refreshing state, wherein the second message carries information related to refreshing a path state, so that the second network equipment establishes the LSP according to the information related to refreshing the path state in the second message;
• and
• the second network equipment, configured to receive the first message sent by the first network equipment;
• determine the time of holding the path refreshing state according to the information in the first message;
• receive the second message sent by the first network equipment in the time of holding the path refreshing state;
• and establish a local LSP according to the information related to refreshing the path state in the second message.