Bridge-Group Virtual Interface
The BVI is a virtual interface within the router that acts like a normal routed interface. The BVI does not support bridging itself, but acts as a gateway for the corresponding bridge-domain to a routed interface within the router.
Aside from supporting a configurable MAC address, a BVI supports only Layer 3 attributes, and has the following characteristics:
Uses a MAC address taken from the local chassis MAC address pool, unless overridden at the BVI interface.
Is configured as an interface type using the interface bvi command and uses an IPv4 address that is in the same subnet as the hosts on the segments of the bridged domain. The BVI also supports secondary addresses.
The BVI identifier is independent of the bridge-domain identifier. These identifiers do not need to correlate like they do in Cisco IOS software.
Is associated to a bridge group using the routed interface bvi command.