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CLI-based Configuration Guide - VPN

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document describes VPN features on the device and provides configuration procedures and configuration examples.
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PW Signaling Protocols

PW Signaling Protocols

PW Signaling Protocols and VPLS Implementation Modes

A PW mainly uses LDP as its signaling protocol and LDP is the basis for implementation of LDP VPLS.


Introduction to LDP VPLS

LDP VPLS (Martini VPLS) uses a static discovery mechanism to discover VPLS members using LDP signaling. VPLS information is carried in extended TLV fields (type 128 and type 129 FEC TLVs) of LDP signaling packets. During the establishment of a PW, the label distribution mode is downstream unsolicited (DU) and the label retention mode is liberal.

Implementation process

  • Figure 12-4 shows the process of establishing a PW using LDP signaling.

    Figure 12-4  Establishing a PW using LDP signaling

    1. After PE1 is associated with a VSI, and PE2 is configured as a peer of PE1, PE1 sends a Label Mapping message to PE2 in DU mode if an LDP session already exists between PE1 and PE2. The Label Mapping message carries information required to establish a PW, such as the PW ID, VC label, and interface parameters.
    2. Upon receipt of the message, PE2 checks whether itself has been associated with the VSI. If PE2 has been associated with the VSI and PW parameters on PE1 and PE2 are consistent, PE1 and PE2 belong to the same VSI. In this case, PE2 establishes a unidirectional VC named VC1 immediately after PE2 receives the Label Mapping message. Meanwhile, PE2 sends a Label Mapping message to PE1. After receiving the message, PE1 takes a similar sequence of actions to PE2 and establishes VC2.
  • Figure 12-5 shows the process of tearing down a PW using LDP signaling.

    Figure 12-5  Tearing down a PW using LDP signaling

    1. After the peer configuration about PE2 is deleted from PE1, PE1 sends a Label Withdrawal message to PE2. After receiving the Label Withdrawal message, PE2 withdraws its local VC label, tears down VC1, and sends a Label Release message to PE1.
    2. After receiving the Label Release message, PE1 withdraws its local VC label and tears down VC2.
Updated: 2019-08-07

Document ID: EDOC1100033725

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