From: Sean C. (Upp_and_Upp@hotmail.com)
Date: Sun Jun 10 2007 - 21:00:49 ART
Hi Jason,
You might want to check the archives of the various vendors. They may have
something in their tech library available for free download. I know NMC's
pdf helped me when I was studying. Check out their "A scenario with
multiple redistribution points" at the link below (from the sounds of your
e-mail's subject line, I almost suspect you already have discovered this
gem):
http://www.netmasterclass.net/site/libpdf.php
As you've stated, there's so many different ways to redistribute and
manipulate routes (redistribution between protocols, connected interfaces,
changing Admin Distance, distro lists, metrics, PBR, passive-ints, etc....),
it's hard to offer one all inclusive document. While on the theme of NMC, I
can vouch that their workbook really explained different redistribution
patterns. The ins and outs of each solution. Also, IE's CoD was a good
resource at demonstrating the effects of various techniques. But, of
course, these cost some $$...
HTH,
Sean C #17085
----- Original Message -----
From: "Jason Guy (jguy)" <jguy@cisco.com>
To: <ccielab@groupstudy.com>
Sent: Sunday, June 10, 2007 11:35 AM
Subject: Multiple Redistribution points
Hi group,
I am sitting here trying to determine what the subtle differences are
between the various methods of configuring redistribution when there are
multiple redistribution points, in this case it is EIGRP<->OSPF.
I like to typically use the route tags to do my filtering, but I find
that this does not work if there is a backup scenario, and the protocol
domain becomes partitioned. It seems easy and straight forward.
The alternate method I have read about (probably on the list) is
altering Admin Distance for the routes redistributing at the protocol
boundary. I found this works for the partitioned domain problem. I
believe by adding an external distance to OSPF higher than EIGRP
external, it can ignore routes that would cause a route loop. I am
still pondering this however. :)
Is there any good doc to read to understand the subtle art of
redistribution and other methods of doing it, and perhaps situations
when to apply one versus another?
Just when I thought I had a concept down...it scurries away. :)
Jason
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