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MPLS Fast Reroute (also called MPLS local restoration or MPLS local protection) is a local restoration network resiliency mechanism. It is actually a feature of resource reservation protocol (RSVP) traffic engineering (RSVP-TE). In MPLS local protection each label-switched path (LSP) passing through a facility[1] is protected by a backup path which originates at the node immediately upstream to that facility.[2][3][4][5][6]
This node which redirects the traffic onto the preset backup path is called the Point of Local Repair (PLR), and the node where a backup LSP merges with the primary LSP is called Merge Point (MP).[2][3] This mechanism (local protection) provides faster recovery because the decision of recovery is strictly local. For comparison, when recovery mechanisms are employed at the IP layer, restoration may take several seconds which is unacceptable for real-time applications (such as VoIP). In contrast, MPLS local protection meets the requirements of real-time applications with recovery times comparable to those of shortest path bridging networks or SONET rings (< 50 ms).[2][3][4]
^The term facility is usually referred to a link or node.
^ abcAslam; et al. (2005-02-02). "NPP: A Facility Based Computation Framework for Restoration Routing Using Aggregate Link Usage Information". QoS-IP 2005 : quality of service in multiservice IP network. Retrieved 2006-10-27.
^ abcRaza; et al. (2005). "Online routing of bandwidth guaranteed paths with local restoration using optimized aggregate usage information". IEEE International Conference on Communications, 2005. ICC 2005. 2005. IEEE-ICC 2005. Vol. 1. pp. 201–207. doi:10.1109/ICC.2005.1494347. ISBN 0-7803-8938-7. S2CID 5659648.
^ abLi Li; et al. (2005). "Routing bandwidth guaranteed paths with local restoration in label switched networks". IEEE Journal on Selected Areas in Communications. IEEE Journal on Selected Areas in Communications. 23 (2): 437–449. doi:10.1109/JSAC.2004.839424.
^Pan; et al. "Fast Reroute Extensions to RSVP-TE for LSP Tunnels networks". RFC-4090. Retrieved 2006-10-27.
^Kodialam; et al. (2001). "Dynamic Routing of Locally Restorable Bandwidth Guaranteed Tunnels using Aggregated Link Usage Information". Proceedings IEEE INFOCOM 2001. Conference on Computer Communications. Twentieth Annual Joint Conference of the IEEE Computer and Communications Society (Cat. No.01CH37213). IEEE Infocom. pp. 376–385. 2001. Vol. 1. pp. 376–385. doi:10.1109/INFCOM.2001.916720. ISBN 0-7803-7016-3. S2CID 13870642.
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