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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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LDP Session Alternates Between Up and Down States

LDP Session Alternates Between Up and Down States

Fault Description

An LDP session alternates between Up and Down states when you add, change, or delete the LDP GR timer, LDP MTU, LDP authentication, LDP Keepalive timer, or LDP transport address.

Procedure

  1. Run the display this command in the LDP view to check whether LDP GR or LDP MTU is configured.

    • If the following information is displayed:
      mpls ldp
       graceful-restart
      
      LDP GR is configured.
    • If the following information is displayed:
      mpls ldp
       mtu-signalling apply-tlv
      
      LDP MTU is configured.
    • If information similar to the following is displayed:
      mpls ldp
       md5-password cipher 2.2.2.2 %^%#="+W)uY+N$8',5Lhem%H4ZyT@h{24%Lm6A'HAnS!%^%#
      
      or
      mpls ldp
       authentication key-chain peer 2.2.2.2 name kc1
      
      LDP authentication is configured.

  2. Run the display this command in the interface view to check whether the LDP Keepalive timer or LDP transport address is configured.

    • If information similar to the following is displayed:
      mpls ldp
      mpls ldp timer keepalive-hold 30
      
      The LDP Keepalive timer is configured.
    • If information similar to the following is displayed:
      mpls ldp
      mpls ldp transport-address interface
      
      The LDP transport address is configured.

  3. After the preceding configurations are complete, wait for 10s and the LDP session becomes stable.
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Updated: 2019-04-08

Document ID: EDOC1100065745

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