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NE40E V800R010C00 Configuration Guide - MPLS 01

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Configuring the Dynamic LDP Advertisement Capability

Configuring the Dynamic LDP Advertisement Capability

On LSRs enabled with global LDP, the dynamic LDP advertisement capability allows extended LDP functions to be dynamically enabled or disabled when the LDP session is working properly, ensuring stable LSP operation.


On an LSR disabled from the dynamic LDP negotiation capability, if an extended LDP function is enabled after an LDP session has been created, the LDP session will be interrupted and the extended LDP function will be negotiated, affecting LSP stability. The dynamic LDP advertisement capability allows an extended LDP function to be enabled or disabled dynamically during proper operation of an LDP session, ensuring LSP stability.


Enabling this function immediately after LDP is enabled globally is recommended. The dynamic LDP advertisement capability does not affect existing LDP functions.

Before the dynamic LDP advertisement capability is enabled, MPLS and LDP must be enabled globally.

Pre-configuration Tasks

Before configuring a local LDP session, enable MPLS LDP globally.


  1. Run:


    The system view is displayed.

  2. Run:

    mpls ldp

    The MPLS-LDP view is displayed.

  3. Run:


    The dynamic LDP advertisement capability is enabled.

    By default, the dynamic LDP advertisement capability is not enabled.


    Enabling dynamic LDP advertisement after an LDP session is established will result in reestablishment of the LDP session.

  4. Run:


    The configurations are committed.

Checking the Configurations

After configuring a local LDP session, run the display mpls ldp command. The command output shows that the Capability-Announcement field is On, which indicates that the dynamic LDP advertisement capability has been enabled.
<HUAWEI> display mpls ldp
                           LDP Global Information
 Protocol Version        : V1            Neighbor Liveness     : 600 Sec
 Graceful Restart        : Off           FT Reconnect Timer    : 300 Sec
 MTU Signaling           : On            Recovery Timer        : 300 Sec
 Capability-Announcement : On            Longest-match         : Off
 mLDP P2MP Capability    : Off           mLDP MBB Capability   : Off
 mLDP MP2MP Capability   : Off           mLDP Recursive-fec    : Off

                          LDP Instance Information
 Instance ID             : 0             VPN-Instance          : 
 Instance Status         : Active        LSR ID                :
 Hop Count Limit         : 32            Path Vector Limit     : 32
 Loop Detection          : Off
 DU Re-advertise Timer   : 10 Sec        DU Re-advertise Flag  : Off
 DU Explicit Request     : Off           Request Retry Flag    : Off
 Label Distribution Mode : Ordered       
 Label Retention Mode    : Liberal(DU)/Conservative(DOD)
 Graceful-Delete         : Off           Graceful-Delete Timer : 5 Sec
 Igp-sync-delay Timer    : 10 Sec       
 Ipv6-family             : Off
 Local-Ipv6-transport-address   :  --
Updated: 2018-07-12

Document ID: EDOC1100028530

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