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What is a Label Distribution Protocol?

April 26, 2017distribution Label Protocol

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What is a Label Distribution Protocol?

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A label distribution protocol (LDP) is a specification which lets a label switch router (LSR) distribute labels to its LDP peers. When a LSR assigns a label to a forwarding equivalence class (FEC) it needs to let its relevant peers know of this label and its meaning and LDP is used for this purpose. Since a set of labels from the ingress LSR to the egress LSR in an MPLS domain defines a Label Switched Path (LSP) and since labels are mapping of network layer routing to the data link layer switched paths, LDP helps in establishing a LSP by using a set of procedures to distribute the labels among the LSR peers.