From: amilabs (amilabs@optonline.net)
Date: Thu Feb 05 2004 - 19:53:32 GMT-3
I have seen/worked on routers with over 30 neighbors for eigrp(across
several interfaces though) on 7500 series routers. You have to have a
lot of memory and processing power for the high number of neighbors. And
remember the ramifications of update flow pacing, dual boundaries and
neighbor/topology tables that router will have. Even with 30 neighbors
convergence was not bad. You have to keep in mind of your failure
strategy. If you have feasible successors for your sites then a failure
will result in quick convergence however if not then dual will have to
kick in and queries will be forthcoming from a failed site to the
others. All spoke sites will see the queries for they will form the dual
query boundary. You can resolve this by using the eigrp stub option,
thus removing the spokes from the querying processing. I recall reading
in the "Eigrp Network Design Solutions" book that the rule of thumb was
something like 30 to 50 neighbors OFF of ONE interface if your wan is
Frame-relay based for pseudobroadcasting and update pacing reasons. Also
remember that with many neighbors on one router the impact of a simple
eigrp based change will result in all of those neighbors adjacencies
being reset. So schedule your eigrp maintenance changes off hours.
Just my two cents. I have not touched eigrp in almost 2 years for I
have been involved in some non Cisco related ventures.
Regards..
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Connie Nie
Sent: Thursday, February 05, 2004 5:17 PM
To: ccielab@groupstudy.com
Subject: Max. Number of OSPF (and EIGRP) Adjacency
I have a design questions for those of you who work or have worked in a
very large environment---what is the largest number of OSPF (or EIGRP)
adjacencies you have seen on one router ---and on what kind of hardware
platform?
We are working on a design using DMVPN, which means the hub router has
to be adjacent with all the spoke routers. We want to use as few
head-end routers as possible (economical reason) and also have a
reliable network---just wonder where the golden mean will be in this
case.
I would appreciate any input you can offer.
Thanks,
Connie
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