Configuring Forwarding Adjacency or IGP Shortcut

Procedure

1. Configuring IGP Shortcut
   1. Run system-view

      The system view is displayed.

   2. Run interface tunnel interface-number

      The interface view of the TE tunnel is displayed.

   3. Run mpls te igp shortcut [ isis | ospf ]

      The IGP shortcut is configured.

      By default, the IGP shortcut is not configured. If the IGP type is not specified when the IGP shortcut is configured, both IS-IS and OSPF are supported by default.

   4. Run mpls te igp metric { absolute | relative } value

      The IGP metric value for the tunnel is configured.

      By default, the metric value used by the TE tunnel is the same as that of the IGP.

      You can specify a metric value used by the TE tunnel when path is calculated in the IGP shortcut feature.

      • If the absolute metric is used, the TE tunnel is equal to the configured metric value.

      • If the relative metric is used, the TE tunnel is equal to the sum of the metric value of the corresponding IGP path and relative metric value.

   5. You can select either of the following modes to configure IGP shortcut.

      • For IS-IS, run:

        isis enable [ process-id ]

        IS-IS is enabled on the tunnel interface.

      • For OSPF, run the following commands in sequence:

        1. Run the quit command to return to the system view.

        2. Run the ospf [ process-id ] command to enter the OSPF view.

        3. Run the enable traffic-adjustment command to enable IGP shortcut function.

   6. Run commit

      The configuration is committed.

2. Configuring Forwarding Adjacency
   1. Run system-view

      The system view is displayed.

   2. Run interface tunnel interface-number

      The tunnel interface view is displayed.

   3. Run mpls te igp advertise [ hold-time interval | include-ipv6-isis ] ^*

      The forwarding adjacency is enabled.

      By default, forwarding adjacency is not configured.

      If IPv6 IS-IS is used, specify include-ipv6-isis.

   4. Run mpls te igp metric { absolute | relative } value

      The IGP metric value for the tunnel is configured.

      The IGP metric value must be set properly to ensure that LSP information is advertised and used correctly. For example, the metric of a TE tunnel must be less than that of IGP routes to ensure that the TE tunnel is used as a route link.

      If relative is configured and IS-IS is used as an IGP, this step cannot modify the IS-IS metric value. To change the IS-IS metric value, configure absolute in this step.

   5. You can select either of the following modes to enable the forwarding adjacency.

      • For IS-IS, run isis enable [ process-id ]

        IS-IS is enabled on the tunnel interface.

      • For OSPF, run the following commands in sequence:

        1. Run quit

           The system view is displayed.

        2. Run ospf [ process-id ]

           The OSPF view is displayed.

        3. Run enable traffic-adjustment advertise

           Forwarding adjacency is enabled.

   6. Run commit

      The configuration is committed.