Enabling LBDT

Procedure

1. Run system-view

   The system view is displayed.

2. Run interface interface-type interface-number

   The interface view is displayed.

3. Run loopback-detect enable

   LBDT is enabled on the interface.

   By default, LBDT is disabled on an interface.

4. Run the following commands as required.

   To use LBDT to detect loopbacks on an interface, skip this step.

   To use LBDT to detect loops on the downstream network, perform this step.

   1. Run the following commands as required.

      • Add the access interface to the VLAN where loops need to be detected.

        1. Run port link-type access

           The interface is configured as the access interface.

        2. Run port default vlan vlan-id

           The access interface is added to the VLAN where loops need to be detected.

      • Add the hybrid interface to the VLAN where loops need to be detected.

        1. Run port link-type hybrid

           The interface is configured as the hybrid interface.

        2. Run port hybrid tagged vlan { { vlan-id1 [ to vlan-id2 ] }&<1-10> | all }

           The hybrid interface is added to the VLAN where loops need to be detected.

      • Add the trunk interface to the VLAN where loops need to be detected.

        1. Run port link-type trunk

           The interface is configured as the trunk interface.

        2. Run port trunk allow-pass vlan { { vlan-id1 [ to vlan-id2 ] }&<1-40> | all }

           The trunk interface is added to the VLAN where loops need to be detected.

   2. Run loopback-detect vlan { vlan-id1 [ to vlan-id2 ] } &<1-10>

      LBDT is configured to detect loops in the specified VLAN.

      By default, LBDT is not configured to detect loops in the specified VLAN.

      An interface can send LBDT packets with the specified VLAN tag only when the specified VLAN has been created.

5. Run commit

   The configuration is committed.