Take the 2-minute tour ×
Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

What is the difference between BVI and Bridge on Cisco IOS routers?

share|improve this question

1 Answer 1

up vote 1 down vote accepted

A BVI is a "bridge virtual interface" and should be the Layer 3 bit (the interface that has an IP address). The physical interface(s) attached to the bridge-group should be purely layer 2 interfaces.

share|improve this answer
    
OK, so that kinda tells me what BVI is,, but what is bridge group? –  George Bailey Jan 3 '11 at 19:35
    
@GeorgeBailey If you have an interface BVI17, all interfaces with "bridge-group 17" will be in the same group and BVI17 will provide the L3 connectivity. –  Vatine Jan 3 '11 at 19:48
    
So.. they are not alternative options but rather they are on different levels of my configuration? Is it possible then to have a bridge group that does not have BVI? If so, then what would I lose? (access lists?) –  George Bailey Jan 10 '11 at 15:49
    
@George Bailey: The ability for the router to interact with the interfaces on a Layer 3 level (or, as far as I recall at least). The "BVI interface" is, essentially, the same as the "Interface VLAN" on a switch (the SVI). –  Vatine Jan 10 '11 at 17:36
    
+1: Thank you for bearing with me. –  George Bailey Jan 10 '11 at 17:56

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.