From: Schulz, Dave (DSchulz@dpsciences.com)
Date: Wed May 10 2006 - 10:21:33 ART
Zoen -
There is a lot to discuss here, but one item that helped clear up
redistribution for me, was understanding what is redistributed from
where (RIB or database). When you redistribute from one protocol to
another, it will look in the routing table (not the database) to
determine which routes to redistribute. So, when you redistribute RIP
into OSPF, it is going to pull the routes that are in the routing table
that are learned by RIP, if the route was already learned by EIGRP
(having a better admin distance, then it will not get redistributed.
So, if you redistribute from RIP to OSPF to EIGRP....the route that is
in the route table is redistributed from that routing protocol, even
though they are in the database. And, you will not have the same route
in the routing table from three different protocols.
Dave Schulz,
Email: dschulz@dpsciences.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Koen Zeilstra
Sent: Wednesday, May 10, 2006 7:49 AM
To: ccielab@groupstudy.com
Subject: redistributing localy injected routes [20060510]
Hi Group,
I have 3 questions regarding redistribution.
Q1.
2 steps:
1. Make an interface part of an IGP via the network statement
2. Redistribute that IGP into another IGP via another link.
In some occasions this will work. For example RIP -> OSPF. Because rip
sees the routes part of the network statement as redistributed from
connected.
I have seen it working for OSPF -> EIGRP as well.
Why doesn't it work for others? Ie. what rule prohibits this.
Q2.
Why doesn't a redistribute RIP to OSPF to EIGRP on the same router work?
Q3.
This merely sums up the questions above I guess. When redistributing,
does
the redistribution process go from database to database directly or via
the general routing table? For example does a OSPF proces redistributes
EIGRP routes from the EIGRP topology or from the EIGRP routes in
the routing table?
thanks,
Koen
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