From: mnmbaker@xxxxxxxxxx
Date: Fri Aug 30 2002 - 11:22:35 GMT-3
My understanding of IRB is as follows:
1. It is designed to allow several bridged interfaces to route their traffic
across to routed interfaces.
2. Normally, 2 or more interfaces are put in the bridge-group (not much reason
to have a bridge group otherwise). A BVI interface is then created to gather
the bridged interfaces under one IP umbrella. The BVI interface appears to all
other routed interfaces as another routed interface.
3. If you create a BVI, the IP address for that group of bridged interfaces
should be on the BVI, not an individual interface.
4. The "bridge x route IP" command tells the BVI to route IP between itself
(the bridgegroup) and other routed interfaces.
5. Check out
http://www.cisco.com/univercd/cc/td/doc/product/l3sw/4908g_l3/ios_12/7w515d/con
f
ig/bridging.htm#xtocid176216 for more info (watch wordwrap).
Mark
> Group,
>
> I am a bit confused with Integrated Routing and Bridging here.
> I created a bridge group with "bridge X proto ieee" on the
> router,enable IRB with "bridge irb",put interface fa0/0 in that group with
> "bridge-group 1".
> When I do "sh int fa0/0 irb", I can see ip is being both routed and
> bridged on interface fa0/0.
> My question is, do I need to config a BVI interface to route ip traffic
> on fa0/0?
> If I do, does that mean I have to take off the ip address on fa0/0 and
> put it in BVI interface?
> If I don't, how ip traffic incoming in fa0/0 being routed as I can
> still see the network connects to fa0/0 shows up in my ospf routing domain?
>
> Also can anyone help me to explain the following four commands a bit in
> detail? What's the difference between them?
>
> bridge X route ip
> no bridge X route ip
> bridge X bridge ip
> no bridge X bridge ip
>
> any input will be appreciated and thanks in advance.
>
> Frank
>
>
>
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