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VPLS Multihoming: Bridge Flush of MAC Cache on Topology Change

When an MX Series router in a VPLS multihomed Layer 2 ring is running a spanning-tree protocol with root protection enabled, you can modify the default actions taken by the MX Series router when the topology changes. To do this, configure the VPLS root protection topology change actions.

By default, if root protect is enabled and then the topology changes, the bridges do not flush the media access control (MAC) address cache of the MAC addresses learned when other interface ports were blocked.

To change the default behavior, you can use the following statement:

You can include the statement at the [edit protocols (mstp | rstp | vstp)] hierarchy level (to control global spanning-tree protocol behavior) or at the [edit protocols vstp vlan vlan-id] hierarchy level (to control a particular VLAN).

Specifically, MAC flush messages are sent from the blocked PE to LDP peers based on the mapping of system identifier to IP addresses as specified using the system-id statement.

Note: VPLS root topology change actions are configured independently of VPLS, the spanning-tree protocol, or the spanning-tree protocol root protect option.

 

Related Documentation

 

Published: 2013-02-07

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