I just got through learning about this myself over the past couple of
weeks - I was working a lab problem that was kicking my a$$, but I got
through it. Here's how I look at the basics, though - in an evolutionary
pattern:
1) Think of your basic, not-overly-bright router. You can either have "ip
routing" enabled, in which case IP is routed between ports, or you can have
"no ip routing," in which case you'll bridge between ports. Can't have
both, so that's where CRB comes in.
2) With CRB, you can set up some ports for routing, and some ports for
bridging. Unfortunately, this solution didn't really help anyone, since the
bridge ports could only talk to other bridge ports, and the router ports
could only talk to other router ports, but never the twain did meet. Enter
IRB.
3) With IRB, you can now have some ports that bridge, some ports that route,
and then route between the bridge ports and the routed ports by using a
BVI - a bridged virtual interface. (Here's the hint, and the key to the
problem that was raking me over the coals for two solid weeks: whatever
protocol you want to bridge (IPX, in my case) needs to be *routed* on the
BVI!)
HTH,
BJ
----- Original Message -----
From: Burnham, Chris
To: [EMAIL PROTECTED]
Sent: Wednesday, June 13, 2001 9:40 AM
Subject: Bridging IRB versus CRB [7:8331]
In CRB. Concurrent Routing & Bridging can route a protocol on one group of
interfaces & bridge that protocol on another group of interfaces
The traffic on each group of interfaces cannot be switched between groups
unless either of the following conditions are met:
1)Bridged Interfaces are given Network layer address
2)Routed interfaces are put in the bridge group.
Once either of these two conditions are met you are routing and bridging on
the same interface.? My question is ,isn't this is what IRB (integrated
routing & bridging) is ment to achieve.? If so what is the
difference?????????????????
Chris Burnham,
Systems Engineer,
Delphis Consulting Plc.
Tel: +(44) 020 7916 0200
Mob: +(44) 07799403576
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