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Configuration Guide - MPLS

S7700 and S9700 V200R013C00

This document describes the configurations of MPLS, including Static LSP, MPLS LDP, MPLS QoS, MPLS TE, MPLS OAM, Seamless MPLS.
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Basic Concepts of LDP

Basic Concepts of LDP

LDP Peers

Two LSRs that use LDP to establish an LDP session and exchange label messages are called LDP peers. LDP peers learn labels from each other over the LDP session between them.

LDP Adjacency

When an LSR receives a Hello message from its peer, an LDP adjacency is established. Two types of LDP adjacencies are used:
  • Local adjacency

    Discovered by multicasting a Hello message (Link Hello message).

  • Remote adjacency

    Discovered by unicasting a Hello message (Targeted Hello message).

LDP maintains peer information based on adjacencies. The peer type is defined by the type of LDP adjacency. A peer can be maintained by multiple adjacencies. If a peer is maintained by both local and remote adjacencies, the peer type is coexistent local and remote.

LDP Session

LSRs exchange messages, such as label mapping and release messages, over LDP sessions. LDP sessions are only established between LDP peers. LDP sessions are classified into the following types:

  • Local LDP session

    Established between two directly connected LSRs.

  • Remote LDP session

    Established between two directly or indirectly connected LSRs.

The local and remote LDP sessions can coexist.

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Updated: 2019-04-08

Document ID: EDOC1100065745

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