A LDP Fast Protection Switching Scheme for Concurrent Multiple Failures in MPLS Network

In this paper, we provide a non route-calculating MPLS LDP fast protection switching scheme called LDPNRC-FPS scheme which is efficient in transient multi-failures in MPLS networks. This scheme makes full use of various working modes and configurable loop detection of LDP protocol.. When network failures happen, the scheme need not to compute routing again. The scheme uses Path Vector TLV and Hop Count TLV in LDP mapping message to avoid loop intransient multi-failure scenario. Furthermore, OAM mechanism has been introduced into LDP NRC-FPS scheme for accelerating fault recovery process. Compared with traditional fast rerouting strategies in IP and MPLS layer, it reduces the failure recovery time of rerouting and has the advantage of more efficient network resource utilization. Performance analysis shows that LDP NRC-FPS scheme outperforms than traditional IP fast reroute scheme and MPLS protection switching scheme at loop ratio , path unreachable ratio and control message overhead aspects.