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NE40E V800R010C00 Configuration Guide - MPLS 01

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Enabling LDP-IGP Synchronization

Enabling LDP-IGP Synchronization

LDP-IGP synchronization needs to be enabled on interfaces on both ends of the link between the node where a primary LSP and a backup LSP diverge from each other and its LDP peer on the primary LSP. LDP-IGP synchronization is enabled either on an interface or in an IGP process.

Context

LDP-IGP synchronization can be configured on a specific interface or on interfaces within a specific IGP process:
  • LDP-IGP synchronization can be enabled on specified interfaces when only a few interfaces need to support this function.

  • LDP-IGP synchronization can be enabled on all interfaces in the IGP process when many interfaces on a node need to support this function.

NOTE:

Configure one of the preceding modes as needed.

Procedure

  • Enable LDP-IGP synchronization in the interface view.

    If OSPF is used, perform the following steps on the interfaces on both ends of the link between the node where the primary LSP and the backup LSP diverge from each other and its LDP peer on the primary LSP:

    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      interface interface-type interface-number

      The interface view is displayed.

    3. Run:

      ospf ldp-sync

      LDP-IGP synchronization is enabled on the protected interface.

      NOTE:
      To enable LDP-OSPF synchronization on a multi-area adjacency interface, run the ospf ldp-sync multi-area area-id command.

    4. Run:

      commit

      The configuration is committed.

    If IS-IS is used, perform the following steps on the interfaces on both ends of the link between the node on which the primary LSP and the backup LSP diverge from each other and its LDP peer on the primary LSP:

    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      interface interface-type interface-number

      The interface view is displayed.

    3. Run:

      isis enable process-id

      IS-IS is enabled.

    4. Run:

      isis ldp-sync

      LDP-IS-IS synchronization is enabled on the protected interface.

    5. Run:

      commit

      The configuration is committed.

      NOTE:

      Before configuring both LDP-IGP synchronization and the LDP GTSM function on an interface, set the maximum number of valid hops permitted by the GTSM to the number of actual hops (a value greater than 1) because an LDP session must be established over an indirect link. If the maximum number of valid hops permitted by the GTSM is set to 1, no LDP session can be established. As a result, a route convergence failure occurs or LDP-IGP synchronization cannot take effect.

  • Enable LDP-IGP synchronization in an IGP process.

    If OSPF is used, perform the following steps on the node on which the primary LSP and the backup LSP diverge from each other and its LDP peer on the primary LSP:

    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      ospf [ process-id ]

      A specified OSPF process is started and the OSPF view is displayed.

      process-id specifies an OSPF process. If process-id is not specified, the default OSPF process ID is 1. Run the ospf [ process-id | vpn-instance vpn-instance-name ] * command to associate an OSPF process with a VPN instance and run OSPF in the VPN instance. If a VPN instance is specified, the OSPF process belongs to the specified VPN instance. If no VPN instance is specified, the OSPF process belongs to a public network instance.

    3. Run:

      area area-id

      The OSPF area view is displayed.

    4. Run:

      ldp-sync enable

      LDP-IGP synchronization is enabled.

    5. Run:

      commit

      The configuration is committed.

    If IS-IS is used, perform the following steps on the node where the primary LSP and the backup LSP diverge from each other and its LDP peer on the primary LSP:

    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      isis [ process-id ]

      A specified IS-IS process is started, and the IS-IS view is displayed.

      process-id specifies an IS-IS process. If process-id is not specified, the default IS-IS process ID is 1. Run the isis [ process-id ] [ vpn-instance vpn-instance-name ] command to associate an IS-IS process with a VPN instance.

    3. Run:

      ldp-sync enable

      LDP-IS-IS synchronization is enabled.

    4. Run:

      commit

      The configuration is committed.

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Updated: 2018-07-12

Document ID: EDOC1100028530

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