From: Yves Fauser (Yves@xxxxxxxxx)
Date: Sun Aug 12 2001 - 20:13:27 GMT-3
Chuck,
I agree with your (or Brian's) statement 100%, but this doesn't speak of the
any-to-any adjacency requirement with isis broadcast networks.
If you run isis on multipoint or physical interfaces with more than 2 routers,
you will run into trouble. If you have (or ever saw) running configs with
multipoint or physical interfaces all in one Area, and all as level-1 router I
would be very glad to see them.
>From what I think :
multipoint or physical - to - multipoint or physical FR : Works, but only with
max.2 Routers of the same level.
Yves
Chuck Larrieu wrote:
> 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
> **Please read:http://www.groupstudy.com/list/posting.html
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