Label Distribution Protocol(LDP) is a signalling protocol that is used in an MPLS network to distinguish label information to LERs and LSRs. In this way, it is very similar to an IP routing protocol except that instead of distributing IP network address information, it distributed label information. Before LDP can be enabled on a router, the network must be running a routing protocol. The routing protocol allows LDP to know which destinations it needs to generate labels for. Once a peering session is established, the routers check their routing tables and send out a label associated with networks that they see.
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