From: Chris Lewis \(chrlewis\) (chrlewis@cisco.com)
Date: Sat Sep 03 2005 - 17:02:06 GMT-3
Hi Simon,
Yes, Tim just said they were "something similar" and I agreed.
Chris
-----Original Message-----
From: simon hart [mailto:simon@harttel.com]
Sent: Saturday, September 03, 2005 1:58 AM
To: Chris Lewis (chrlewis); ccie2be; Stefan Grey; ccielab@groupstudy.com
Subject: RE: Fallback bridging
Chris,
is there not a fundamental difference between IRB and fallback bridging,
in that fallback bridging will only bridge non-routable protocols and
that IRB will bridge IP
Simon
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Chris Lewis (chrlewis)
Sent: 03 September 2005 01:06
To: ccie2be; Stefan Grey; ccielab@groupstudy.com
Subject: RE: Fallback bridging
That's a good way to look at it. I would add the following:
With IRB, you turn what are normally layer 3 router ports in to layer 2
ports by issuing the no ip address configuration.
By contrast, with fallback brifging, you turn what are normally layer 2
ports in to layer 3 ports by the no switchport configuration.
For IRB you use bridge 1 protocol ieee, for fallback bridging you use
bridge 1 protocol vlan-bridge
For IRB you tie router interfaces or BVIs together with the bridge-group
X command For fallback bridging you tie routed interfaces or SVIs
together with bridge-group X
I do not have a switch to hand right now, but I'm not sure the link you
provide gives a completely accurate config for this feature. I'll try to
send you a working config next week.
Chris
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
ccie2be
Sent: Friday, September 02, 2005 3:30 PM
To: 'Stefan Grey'; ccielab@groupstudy.com
Subject: RE: Fallback bridging
I think of fallback bridging as something similar to irb but for
switches.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Stefan Grey
Sent: Friday, September 02, 2005 4:09 PM
To: ccielab@groupstudy.com
Subject: Fallback bridging
Hello group,
Could anybody explain shortly what this technology does or give some
links where I could read something about it.
If found this link:
http://www.cisco.com/en/US/products/hw/switches/ps646/products_configura
tion
_guide_chapter09186a008014f345.html
But absolutely didn't understand. Thank you in advance.
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