mLDP Link Protection

Multicast LDP link protection enables fast reroute of traffic carried over LDP LSPs in case of a link failure. You can use LDP point-to-multipoint (P2MP) LSPs to send traffic from a single root or ingress node to several leaf nodes or egress nodes traversing one or more transit nodes. When one of the links of the P2MP tree fails, the subtrees might get detached until the IGP reconverges and multicast LDP initiates label mapping using the best path from the downstream to the new upstream router. To protect the traffic in the event of a link failure, you can configure an explicit tunnel so that traffic can be rerouted using that tunnel. Use the make-before-break (MBB) capabilities of the device to ensure minimum packet loss when attempting to signal a new LSP before tearing down the old LSP. This feature also adds targeted LDP support for multicast LDP link protection.