From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Mon Dec 26 2005 - 03:09:07 GMT-3
No it will not be redistributed back into RIP on the same router since
it's not in the routing table as an OSPF route. On a single router
there is no "three-way" redistribution to protect against this exact
problem.
Here is another example: On a single router if you redistribute a
connected route into RIP and then redistribute RIP into OSPF, the
connected route will not be redistributed into OSPF. Remember that we
are only referring to redistribution on a single router.
Also if you have access to the Internetwork Expert IEATC-RS CoD there is
about 6 hours covering route redistribution. The first 2 hours go over
understanding how the router selects routes to redistribute and issues
related to redistribution on a single router. The remaining 4 hours
cover advanced route redistribution (mutual redistribution on multiple
routers, routing loops, route tagging, debugging, etc).
The idea is to ensure that the student can look at the network/protocol
topology and by knowing where redistribution is occurring, be able to
recognize potential issues before doing the actual redistribution. This
is the level you should be at before you attempt the lab.
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
J. Holmes
Sent: Sunday, December 25, 2005 9:41 PM
To: Cisco certification
Subject: Simple redistribution question
Hi all -
A quick clarification. If we are doing mutual redistribution
on a router between OSPF and RIPv2. Lets say we learn network
192.168.1.0/24 from RIP. This means by default, this route will be
redistributed to OSPF as an O E2 route.
Since I am doing mutual redistribution, OSPF routes will be
redistributed
to RIP. Now is this same 192.168.1.0 O E2 route considered an OSPF
route ? (The concern being that I can redistrute the 192.168.1.0 route
back
to RIP with a more attractive metric, thus creating a loop).
I labbed this one and found that the 192.168.1.0 is not redistributed
back
into the RIP network.
I know that O E2 routes are external to the OSPF network. However,
aren't
they still considered OSPF routes, and candidates for redistribution ?
Will only the "internal" OSPF routes be redistributed ?
Thanks for any replies.
JH
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