Integrated Routing And Bridging; Interface And Hardware Component Configuration Guide For Cisco Ncs 5500 Series Routers, Ios Xr Release - Cisco NCS 5500 Series Configuration Manual

Integrated Routing and Bridging

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.
• Bridge-Group Virtual Interface, page 78
• Supported Features on a BVI, page 78
• BVI Interface and Line Protocol States, page 78
• Prerequisites for Configuring IRB, page 79
• Restrictions for Configuring IRB, page 79
• How to Configure IRB, page 80
• Additional Information on IRB, page 87
• Packet Flows Using IRB, page 87
• Configuration Examples for IRB, page 89
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