Technical Documentation

Configuring VPLS Root Protection Topology Change Actions to Control VLAN Spanning Tree Behavior

To configure VPLS root protection topology change actions to control a particular VLAN:

  1. Enable configuration of the spanning-tree protocol VLAN:

    [edit]
    user@host# edit protocols vstp vlan vlan-id
  2. Optional) Change the priority of the backup bridge in a VPLS multihomed Layer 2 ring with MPLS infrastructure:

    [edit protocols vstp vlan vlan-id]
    user@host# set backup-bridge-priority vpls-ring-backup-bridge-priority
  3. (Optional) Change the hold time before switching to the primary priority when the first core domain comes up:

    [edit protocols vstp vlan vlan-id]
    user@host# set priority-hold-time seconds
  4. Configure the system identifier for bridges in the ring:

    [edit protocols vstp vlan vlan-id]
    user@host# set system-id system-id-value bridge-host-ip-address(es)

    The system-id-value is configured in the format nnnnnn:nnnnnn, where n = any digit from 0 to 9.

    Each bridge-host-ip-address is a valid host IP address with a /32 mask.

    Note: There are no default values for the system identifier or host IP addresses.

  5. Configure bridges to flush the MAC address cache (of the MAC addresses learned when other interfaces ports were blocked) when the spanning-tree topology changes:

    [edit protocols vstp vlan vlan-id]
    user@host# setvpls-flush-on-topology-change
  6. Verify the configuration of VPLS root protection topology change actions to control a particular VLAN:

    [edit]protocols {vstp {vlan vlan-id {backup-bridge-priority priority; # Default is 32,768.priority-hold-time seconds; # Default is 2 seconds.system-id system-id-value {ip-address;}vpls-flush-on-topology-change;}}}

Published: 2010-05-11