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Concurrent Routing and Bridging

After you create the necessary bridge groups and bridge interfaces for your network configuration, you can use the bridge crb command to enable concurrent routing and bridging (CRB) for all bridge groups configured on your router. When CRB is enabled, the router can route a protocol among a group of interfaces in one bridge group and concurrently bridge the same protocol among a separate group of interfaces in a different bridge group on the router.

The router does not switch the protocol between the two bridge groups. Instead, it confines routed traffic to the routed interfaces and bridged traffic to the bridged interfaces. As a result, a protocol can be either routed or bridged on a particular interface, but cannot be both routed and bridged on the same interface.

By default, CRB is disabled for all bridge groups on the router. When you use the bridge crb command to enable CRB, it takes effect for all bridge groups currently configured on your router; you cannot enable CRB for some bridge groups on the router but not for others.

When you first enable CRB, the router issues an implicit bridge route command for any IP, MPLS, or PPPoE interfaces that are currently configured in the interface stack for the bridge group. This command directs the bridge group to route traffic for these protocols. After CRB has been enabled, you must issue an explicit bridge route command to route any new IP, MPLS, or PPPoE interface that is the first occurrence of this protocol in the bridge group. (See Configuring Explicit Routing for details about using the bridge route command.)

As a result, it is important that you issue the bridge crb command after you configure all bridge group interfaces. In this way, the router can detect all IP, MPLS, or PPPoE interfaces in your configuration and direct the bridge group to route traffic from these protocols.

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