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1. (WO2013155675) SYSTEM AND METHOD TO SEND OAM PACKETS ON REDUNDANCY PATHS

Pub. No.:    WO/2013/155675    International Application No.:    PCT/CN2012/074234
Publication Date: Fri Oct 25 01:59:59 CEST 2013 International Filing Date: Thu Apr 19 01:59:59 CEST 2012
IPC: H04L 12/24
Applicants: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
SHAO, Mingchao
Inventors: SHAO, Mingchao
Title: SYSTEM AND METHOD TO SEND OAM PACKETS ON REDUNDANCY PATHS
Abstract:
An improved system and method for transmitting Operations, Administration, and Maintenance, OAM, messages on a redundancy path are provided. For each OAM function on a service instance of a redundancy path "1¤7 comprising one primary path and one secondary path "1¤7 only one OAM endpoint is created. The OAM endpoint can transmit packets over both the primary and secondary paths. The OAM endpoint contains an index to the primary path and a redundancy index which is used to lookup into a redundancy table. Each entry in the redundancy table indicates whether the primary path or the secondary path is active. OAM packets are transmitted on the active path (i.e., primary or secondary). When a switchover between the redundant paths is required (i.e., when a failure or its correction is detected on the primary path), the corresponding redundancy table entry is changed to implement the switchover. In one embodiment, PW OAM over protected LSP is implemented in an MPLS or MPLS-TP network. Only one OAM endpoint is needed for each OAM function on the PW; the OAM endpoint will decide to transmit over primary or secondary LSP based on the redundancy table entry.