This document describes a mechanism for fast detection of MPLS LSP failure when a link fails and scales to all LSPs affected by the failure. Fast detection enables ingress LERs to quickly recover onto backup LSPs. A performance improvement in the reliability of LSPs is expected. The mechanism described relies on a node and network architecture that integrates L1/L2/L3 technology. MPLS provides a useful mechanism for placing traffic in IP networks, which is a key capability for traffic engineering. Label Switched Paths can be defined independent of L3 shortest paths and this enables explicit engineering of traffic loads.
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