No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

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.
Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
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 V200R013C00 Configuration Guide - IP Unicast Routing.

Context

Table 3-9 describes timers used during LDP GR.

Table 3-9  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. To disable a device from re-establishing LDP sessions when LDP GR is enabled or disabled, or the LDP GR timer valure is changed, run the no-renegotiate session-parameter-change graceful-restart command in the MPLS-LDP view.

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.

Verifying 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.

Translation
Download
Updated: 2019-04-08

Document ID: EDOC1100065745

Views: 26547

Downloads: 32

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Share
Previous Next