Technical Documentation

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

To configure VPLS root protection topology change actions to control global spanning tree behavior:

  1. Enable configuration of the spanning-tree protocol:

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

    [edit protocols (rstp | mstp | vstp)]
    user@host# set backup-bridge-priority vpls-ring-backup-bridge-priority
  3. (Optional) Change number of seconds to hold before switching to the primary priority when the first core domain comes up:

    [edit protocols (rstp | mstp | vstp)]
    user@host# set priority-hold-time seconds
  4. Configure the system identifier for bridges in the ring:

    [edit protocols (rstp | mstp | vstp)]
    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 (rstp | mstp | vstp)]
    user@host# setvpls-flush-on-topology-change
  6. Verify the configuration of VPLS root protection topology change actions to control global spanning tree behavior:

    [edit]protocols {(mstp | rstp | vstp) {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