Configuring a bridge domain

Bridge domains are configured independently of the different switching technologies that they support.

Before configuring a bridge domain, configure any logical interface that is to be bound to the bridge domain. Logical interfaces that represent bridge-domain endpoints must be created before they are bound to a bridge domain. For further information on configuration of logical interfaces, refer to Logical Interfaces.

There is an example at the end of this task that shows all the configuration steps in order.

Perform the following task to configure a bridge domain.

From privileged EXEC mode, enter global configuration mode.
```
device# configure terminal
```
Create a bridge domain.
```
device(config)# bridge-domain 5 p2p
```
By default, the bridge-domain service type is multipoint (p2mp). In this example, bridge domain 5 is configured as a point-to-point service (p2p).
Note
Logical interfaces representing bridge-domain endpoints must be created before they can be bound to a bridge domain. For further information, refer to Logical Interfaces.
Bind the logical interfaces for attachment circuit endpoints to the bridge domain.
```
device(config-bridge-domain-5)# logical-interface ethernet 0/6.400
```
In this example, Ethernet logical interface 0/6.400 is bound to bridge domain 5.
Repeat Step 4 to bind other logical interfaces for attachment circuit endpoints to the bridge domain.
```
device(config-bridge-domain-5)# logical-interface port-channel 2.200
```
In this example, port channel logical interface 2.200 is bound to bridge domain 5.
(Optional) Enable local switching for bridge domain 5.
```
device(config-bridge-domain-5)# local-switching
```
By default, local switching is enabled.
(Optional) Enable dropping L2 bridge protocol data units (BPDUs) for bridge domain 5.
```
device(config-bridge-domain-5)# bpdu-drop-enable
```

Example

The following example creates bridge domain 5. It binds ethernet and port-channel logical interfaces to the bridge domain. It configures local switching, and enables dropping of L2 BPDUs.

device# configure terminal
device(config)# bridge-domain 5
device(config-bridge-domain-5)# logical-interface ethernet 0/6.400
device(config-bridge-domain-5)# logical-interface port-channel 2.200
device(config-bridge-domain-5)# local-switching
device(config-bridge-domain-5)# bpdu-drop-enable