This document specifies a fast mechanism for protecting pseudowires (PWs) transported by IP/MPLS tunnels against egress endpoint failures@ including egress attachment circuit (AC) failure@ egress provider edge (PE) failure@ multi-segment PW terminating PE failure@ and multi-segment PW switching PE failure. Operating on the basis of multihomed customer edge (CE)@ redundant PWs@ upstream label assignment@ and context-specific label switching@ the mechanism enables local repair to be performed by the router upstream adjacent to a failure. The router can restore a PW in the order of tens of milliseconds@ by rerouting traffic around the failure to a protector through a pre-established bypass tunnel. Therefore@ the mechanism can be used to reduce traffic loss before global repair reacts to the failure and the network converges on the topology changes due to the failure
RFC 8104-2017 history
2017RFC 8104-2017 Pseudowire (PW) Endpoint Fast Failure Protection