MPLS LDP Session Protection

A common problem in networks is flapping links. The flapping of links can have several causes, but it is not the goal of this book to look deeper into this. Flapping links do have an important impact on the convergence of the network. Because the IGP adjacency and the LDP session are running across the link, they go down when the link goes down. This is unfortunate, especially because the link is usually not down for long. The impact is pretty severe though, because the routing protocol and LDP can take time to rebuild the neighborship. LDP has to rebuild the LDP session and must exchange the label bindings again. To avoid having to rebuild the LDP session altogether, you can protect it. When the LDP session between ...

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