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Community Member

BVI Interfaces

Hi,

Can anyone explain me about when using BVI interfaces?? Or if someone have an article about this topic.

thanks and regards,

2 REPLIES

Re: BVI Interfaces

A BVI interface is used when you want to bridge between some interfaces but route from this group of interfaces to other interfaces. This is the same concept of VLAN interfaces on the 3550 (or above):

bridge 10 protocol ieee

bridge 10 route IP

!

interface ethernet0

bridge-group 10

!

interface ethernet1

bridge-group 10

!

interface ethernet2

ip address 10.1.1.1 255.255.255.0

!

interface bvi 10

ip address 10.2.1.1 255.255.255.0

!

In the example above interfaces ethernet0 & 1 are bridged so all connected devices share the same broadcast domain. To allow routing from this interface a BVI is created for the Bridge-group (in this case 10), this is then the Layer-3 interface for devices connected to Ethernet0 & 1. If a device on ethernet0 wants to talk to a device on ethernet1 it is bridged (the 2 devices are in the same IP network). If a device on Ethernet0 want to talk to a device on Ethernet2 it is routed by the BVI interface.

There is some documentatoin on CCO but I couldn't be bothered searching for it... Have a search for IRB

HTH

Andy

Community Member

Re: BVI Interfaces

Nice explanation, thanks

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