From: Chuck Larrieu (chuck@xxxxxxxxxxxxx)
Date: Sun Aug 12 2001 - 15:06:14 GMT-3
once again, everyone, I refer you all to the excellent information provided
by Brian Dennis a few months ago, and something I re-post every so often
because folks continue to try something, find it doesn't work, and
immediately start asking on the list rather than spend a bit of time
figuring it out and asking for verification of their results. unfortunately,
Cisco does not provide any information about IS-IS in their design guide,
and I have found the configuration references to be lacking in this kind of
useful information.
from Brian:
The issue with ISIS over frame-relay is with a point-to-point subinterface
to a multipoint subinterface or to a physical interface.
I just retested all this in my lab and confirmed what works and what doesn't
work.
Works:
1. point-to-point subinterface to a point-to-point subinterface
2. physical interface to a physical interface
3. mulitpoint subinterface to a multipoint subinterface
4. multipoint subinterface to a physical interface
Doesn't work:
1. point-to-point subinterface to a physical interface
2. point-to-point subinterface to a multipoint subinterface
Basically the issue is with point-to-point interfaces sending point-to-point
IIH's (ISIS hellos) and multipoint or physical interfaces sending LAN IIH's.
There isn't a way to change the hello types.
Also remember that if you're going to run ISIS over frame relay on a
multipoint subinterface or a physical interface you'll need to map clns to
the dlci.
Brian Dennis
CCIE #2210 (R&S)(ISP/Dial)
CCSI #98640
Hope this helps.
Chuck
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Cox, Bryan
Sent: Saturday, August 11, 2001 9:17 PM
To: 'ccielab@groupstudy.com'
Subject: isis on physical / multipoint interfaces
Group,
I have come to the conclusion that ISIS won't run in a frame-relay
environment with physical or multipoint interfaces without a full-mesh.
Even with "frame map clns <dlci> broadcast" on the spokes and hub I never
see the ISIS hellos being received at a spoke from another spoke. Thus no
adjacency is formed between the spokes.
In a full mesh I see the appropriate hellos between all points in the
frame-relay network. IS-IS forms adjacencies and all routes are installed
in the table.
Does anybody have any working configs for a hub and spoke environment with
point-to-multipoint or physical interfaces that they can post that say
otherswise? Or am I on the right track?
Thanks,
Bryan
San Jose October 25th
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