From: Schulz, Dave (DSchulz@dpsciences.com)
Date: Sat Dec 31 2005 - 16:32:15 GMT-3
This is good information, Brian. A question on this.... I took a couple
router set up both EIGRP and RIP between them....and varied the distance
between between them (preferring the different protocols in the RIB)....and,
then looked at each of the databases (eigrp top vs. rip database).....what I
noticed here was, that the when the RIP route was preferred....the EIGRP
database for that same route showed up as "Inaccessible". However, when the
EIGRP route was preferred, the route would age out and be removed from the
table. I am trying to understand why this is the way it is. The big question
is....when the distance is changed to prefer RIP....how does the router know
where/how to get this route? And, why does the EIGRP route show up as
Inaccessible....after all, it is still "accessible", but just preferred by
another protocol (RIP).
Another question....it appears the major issue with redistribution (your
point#2) is for the lack of internal vs. external distance commands (that
EIGRP does), correct? Hypothetically, if all protocols had this mechanism, we
wouldn't has an issue with mutual redistribution of routes, correct?
(everything would be distributed (or not) based on whether it is internal or
external).
Dave
-----Original Message-----
From: nobody@groupstudy.com
To: Nawaz, Ajaz; ccielab@groupstudy.com
Sent: 12/30/2005 11:06 PM
Subject: RE: mutual redistribution
If you know what problem could occur with this topology, if there even
is one to begin with, you will quickly be able to determine the
appropriate solution. I'll give you two hints on how you can answer
your own question:
1) EIGRP has a higher administrative distance for external routes by
default for a reason. What is that reason?
2) If there are not any external EIGRP routes in EIGRP before
redistribution is done between EIGRP and OSPF, you will not need to do
anything (tags, AD, distribute-list, etc). If you do have external
EIGRP routes before doing redistribution or switched EIGRP with RIP, you
would then have an issue to resolve.
Remember that it's just as important to understand why you are doing a
certain configuration as much as it is to know how to do the
configuration ;-)
HTH,
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
Nawaz, Ajaz
Sent: Friday, December 30, 2005 5:40 PM
To: ccielab@groupstudy.com
Subject: mutual redistribution
When mutually redistributing between eigrp and ospf at two separate
points
in the network, what the cleanest & simplest way for preventing imminent
route feedback?,
Having read the archives there's mixed opinions between the use of AD
and
Tags
Many thanks
Ajaz Nawaz
-----------------------------------------
Information in this email may be privileged, confidential and is
intended
exclusively for the addressee. The views expressed may not be official
policy, but the personal views of the originator. If you have received
it
in error, please notify the sender by return e-mail and delete it from
your
system. You should not reproduce, distribute, store, retransmit, use or
disclose its contents to anyone. Please note we reserve the right to
monitor all e-mail communication through our internal and external
networks.
This archive was generated by hypermail 2.1.4 : Mon Jan 09 2006 - 07:07:52 GMT-3