Cisco Systems 1000 Series Manual De Usuario

When packets flow from a Layer 2 bridge domain network to a Layer 3 routing network through the 
bridge domain interface, the packets are treated as bridge domain interface input packets and bytes. 
When packets arrive at a Layer 3 interface and are forwarded through the bridge domain interface to a 
Layer 2 bridge domain, the packets are treated as output packets and bytes, and the counters are updated 
accordingly.

A BDI maintains a standard set of Layer 3 packet counters as the case with all Cisco IOS interfaces. Use 
the show interface command to view the Layer 3 packet counters.

The convention of the counters is relative to the Layer 3 cloud, for example, input refers to the traffic 
entering the Layer 3 cloud from the Layer 2 BD, while output refers to the traffic leaving the Layer 3 
cloud to the Layer 2 BD.

Use the show interfaces accounting command to display the statistics for the BDI status. Use the show 
interface <if-name> command to display the overall count of the packets and bytes that are transmitted 
and received.

When you define an interface or subinterface for a Cisco IOS router, you name it and specify how it is 
assigned an IP address.You can create a bridge domain interface before adding a bridge domain to the 
system, this new bridge domain interface will be activated after the associated bridge domain is 
configured.

When a bridge domain interface is created, a bridge domain is automatically created.

When both bridge domain interface and bridge domain are created, the system maintains the required 
associations for mapping the bridge domain-bridge domain interface pair.

The mapping of bridge domain and bridge domain interface is maintained in the system. The bridge 
domain interface uses the index of the associated bridge domain to show the association. 

 lists the bridge domain interface scalability numbers, based on the type of Cisco ASR 1000 

Series Aggregation Services Router’s Forwarding Processors.

To configure a bridge domain interface, perform the following steps:

Maximum bridge domain interfaces per 
router

4096

4096

4096