From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Wed Jun 16 2004 - 23:00:24 GMT-3
Doug,
Cisco has stated in the past that the CCIE lab is neither a
design test nor a test of best practices for use in the field. Using
this as a guideline, unless a task in the lab specifically states to
ensure that you have optimal routing, do not worry about suboptimal
routing issues.
Remember to not get caught up in trying to configure the lab the
way you would a real network. Meet the requirements of the lab and
nothing more. If you get caught up in worrying about optimized routes,
which I have seen people do, you will waste a lot of valuable time on
something that doesn't count toward passing. The goal is to have
reachability in the lab and not optimized routing.
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Calton, Doug
Sent: Wednesday, June 16, 2004 6:40 PM
To: ccielab@groupstudy.com
Subject: Optimal Routes et al
A lot of the practice labs I have used include redistribution with
specifications for being loop free and using optimal paths. As I work
on these labs, it seems to me that "optimal" is VERY subjective,
particularly in some of the nastier labs with a bazillion overlapping
and alternate connections between routers. E.g., with loopback I/Fs,
the optimal path to them will depend on just where you are coming from
in the network, so what I remotely view as an optimal path to the loop
may not agree with what the host router itself sees as the optimal path,
leading to disjoint paths or even feeback/loops.
I guess I have come to the conclusion that optimization can occur only
within the IGP domain, if anywhere. Once you begin redistributing, all
you can do is rough things in a reasonable fashion, and there is no
clear "right" answer.
Any thoughts on how solutions are evaluated based on this, or other
thoughts?
Doug Calton
Program Manager
AN/TSP
Tel: 513-774-8333
FAX: 978-625-1026
Mobile: 513-253-8484
doug.calton@getronics.com
www.getronics.com/us
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