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Configuration Guide - MPLS

S7700 and S9700 V200R010C00

This document describes MPLS configurations supported by the switch, including the principle and configuration procedures of static LSPs, MPLS LDP, MPLS TE, MPLS QoS, MPLS OAM, Seamless MPLS, and MPLS common features, and provides configuration examples.
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Configuring LDP GR

Configuring LDP GR

Pre-configuration Tasks

LDP Graceful Restart (GR) ensures uninterrupted traffic transmission during a protocol restart or active/standby switchover because the forwarding plane is separated from the control plane.

Before configuring LDP GR, complete the following tasks:

  • Configure a local LDP session. For details, see Configuring Basic Functions of MPLS LDP.

  • Configure IGP GR. For details, see S7700 and S9700 V200R010C00 Configuration Guide - IP Unicast Routing.

Context

Table 3-8 describes timers used during LDP GR.

Table 3-8  Timers used during LDP GR

Timer

Description

Suggestion

Reconnect timer

After the GR Restarter performs an active/standby switchover, the GR Helper detects that the LDP session with the GR Restarter fails, and then starts the Reconnect timer and waits for reestablishment of the LDP session.

The value of the Reconnect timer that takes effect on the GR Helper is the smaller one between the value of the Neighbor-liveness timer set on the GR Helper and the value of Reconnect timer set on the GR Restarter.

When a network with a large number of routes is faulty, you can increase the value of the Reconnect timer to avoid that all the LDP sessions cannot recover within the default timeout period 300s.

Recovery timer

After the LDP session is reestablished, the GR Helper starts the Recovery timer and waits for the recovery of the LSP.

The value of the Recovery timer that takes effect on the GR Helper is the smaller one between the value of the Recovery timer set on the GR Helper and the value of Recovery timer set on the GR Restarter.

When a network with a large number of routes is faulty, you can increase the value of the Recovery timer to avoid that all the LSPs cannot recover within the default timeout period 300s.

Neighbor-liveness timer

The value of the neighbor-liveness timer defines the LDP GR period.

The value of the Neighbor-liveness timer on the GR Restarter is the same as that of the Forwarding State Holding timer.

When the number of LSPs on a network is small, you can set a smaller value for the Neighbor-liveness timer to shorten the GR period.

NOTE:

Enabling or disabling LDP GR, or changing the LDP GR timer value cause LDP session reestablishment.

Perform the following steps on the GR Restarter and GR Helper.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    mpls ldp

    The MPLS LDP view is displayed.

  3. Run:

    graceful-restart

    The LDP GR function is enabled.

    By default, the LDP GR function is disabled.

  4. (Optional) Run:

    graceful-restart timer reconnect time

    The Reconnect timer for the LDP session is set.

    By default, the Reconnect timer is set to 300 seconds.

  5. (Optional) Run:

    graceful-restart timer recovery time

    The LSP Recovery timer is set.

    By default, the LSP Recovery timer is set to 300 seconds.

  6. (Optional) Run:

    graceful-restart timer neighbor-liveness time

    The Neighbor-liveness timer is set.

    By default, the Neighbor-liveness timer is 600 seconds.

Checking the Configuration

  • Run the display mpls graceful-restart command to check information about GR of all protocols related to MPLS.

  • Run the display mpls ldp event gr-helper command to check GR Helper information.

  • Run the display mpls ldp [ all ] [ verbose ] command to check information about LDP.

  • Run the display mpls ldp session [ all ] [ verbose ] command to check information about the LDP session.

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Updated: 2019-04-18

Document ID: EDOC1000141902

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