From: De Witt, Duane (duane.dewitt@siemens.com)
Date: Thu Apr 28 2005 - 02:34:08 GMT-3
Hi
The only weird configuration I have come across in my prep labs is a
split area 0 with the restriction of no virtual links or multiple
processes allowed. I used GRE between the areas which only worked when I
used the correct source and destination addresses. I'm not sure if Cisco
would agree that it works though. Perhaps someone has a template for
this which is viewed as correct?
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
ccie2be
Sent: 27 April 2005 07:46 PM
To: Group Study
Subject: Weird ospf topologies
Hi guys,
I'm trying to collect all the weird, non-standard ospf topologies that
are
never used in the real world but that Cisco loves to come up with in the
lab.
For example, consider this topology:
area 1 rtr-1 area 2 rtr-2 area 3
At first, this looks like an illegal topology because there's no area 0.
However, if a virtual link is configured between rtr-1 and rtr-2, all is
well.
Here's another one.
area 0 rtr-1 area 2 rtr-2 area 3 rtr-3 area 4
At first, this looks also illegal but by adding a 2nd virtual-link
between
rtr-2 and rtr-3, this will also work since it's OK to chain v-links
together. (BTW, off-hand, I don't know if area 0 were changed to area 1
if
this would still work but I imagine it would. Any comments?
So, this is a call for all weird, non-standard ospf topologies.
Be creative. Try to think of anything outside of the norm because you
know
Cisco is doing the same.
Don't limit your responses to just things having to do with
virtual-links
either. If you know of or can think of a non-intuitive way for a
certain
ospf requirement to be worded, please share your thoughts whether it's
about
summarization, network type, a seldom used ospf feature, nssa areas, or
anything else regarding ospf.
I know that Cisco can find other things to trip us up on during the lab
but
let's at least remove ospf as a potential pitfall.
Tim
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