METHOD OF SHARED MESH PROTECTION SWITCHING

摘要

PURPOSE: A share mesh protection switching method is provided to rapidly execute a linear protection switching process with an automatic protection switching protocol. CONSTITUTION: Share nodes(P,Q) receive a protection switching request of a first protection path included in a first end-to-end linear protection domain from a first end terminal node(D)(S503). The share nodes determines whether a share protection segment shared by the first protection path is available(S504). The share nodes transmit a protection switching response to the first end node according to the availability(S508). When the share protection segment is not used, the first end node transmits an available response for protection switching to the first end terminal node. [Reference numerals] (AA) No; (BB) Yes; (S501) Detecting W4 error; (S502) Detecting W2 error; (S503) Requesting protection switching; (S504) Determining availability of shared protection segment; (S505) Pre-emption request; (S506) Stopping the use of shared protection segment; (S507) Pre-emption response; (S508) Protection switching response; (S509) Is protection switching possibility response received from all share nodes?; (S510) 1:1 linear protection switching with an end terminal node C;