Configuring Explicit Routing

After you enable concurrent routing and bridging, you may need to issue the bridge route command to configure explicit routing for IP, MPLS, or PPPoE protocols if both of the following conditions are true:

• You configure new IP, MPLS, or PPPoE interfaces after you issue the bridge crb command to enable concurrent routing and bridging.
• The IP, MPLS, or PPPoE interface is the first occurrence of this protocol in the bridge group.

For example, assume that you want to route (rather than bridge) IP, MPLS, and PPPoE interfaces, but only IP and MPLS interfaces are configured when you issue the bridge crb command. The router detects the IP and MPLS interfaces and issues implicit bridge route commands to route these protocols.

If you subsequently add a new IP interface to a bridge group, you do not need to issue the bridge route command because the implicit bridge route command for IP is still in effect. However, if you subsequently add a new PPPoE interface to the bridge group, you must issue an explicit bridge route command for PPPoE to direct the bridge group to route PPPoE packets.

You can also use the bridge route command as a way to filter packets by routing. If you issue an explicit bridge route command for a protocol that is not currently configured in any of your bridge groups, the bridge group must route rather than bridge that protocol, but does not have the required interface stacking to do so. As a result, the bridge group discards (drops) those packets.

To configure explicit routing:

1. Ensure that you have enabled concurrent routing and bridging. (See Enabling Concurrent Routing and Bridging for details.)
2. From Global Configuration mode, enable routing of IP, MPLS, or PPPoE packets in a specified bridge group.

   host1(config)#bridge westford02 route ip

   host1(config)#bridge westford02 route mpls

   host1(config)#bridge westford03 route pppoe

3. (Optional) Use the appropriate show command to verify that routing is enabled for the specified protocols in the bridge group.

   host1#show bridge westford02

bridge route

• Use to enable the routing of IP, MPLS, or PPPoE packets in a specified bridge group when concurrent routing and bridging (CRB) is enabled.
• If you issue this command for a protocol that is not configured in any bridge groups on your router, the bridge group discards (drops) those packets.
• You must specify the alphanumeric name of the bridge group specified in the bridge command.
• Choose one of the following keywords to indicate the protocol type that the bridge group routes: ip, mpls, or pppoe.
• Example

  host1(config)#bridge westford02 route ip

• Use the no version to disable routing of the specified protocol in the specified bridge group.
• See bridge route.

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