From: Chuck Larrieu (chuck@xxxxxxxxxxxxx)
Date: Sun Dec 17 2000 - 02:21:13 GMT-3
These are my first looks into the issue of VLSM and FLSM redistribution. So
please forgive me if this is a bit of a naïve question.
Practice lab scenario - OSPF and IGRP redistribution
Redistribution router
-------------------------
OSPF..............................IGRP
172.16.1.0/24................172.16.24.0/24
172.16.4.64/26...............172.16.23.0/24
Other OSPF routes from elsewhere
----------------------
172.16.2.0/24
172.16.3.0/24
172.16.10.8/30
172.16.10.12/30
172.16.10.4/30
172.16.4.0/26
On the redistribution router, I configure the IGRP process and place the
172.16.0.0 network into it. The bad news is that the IGRP domain sees the
172.16.1.0 network, even though it shouldn't in that it is supposed to be
unique in the OSPF domain. The further bad news is that when I do a one way
redistribution into the OSPF domain, all OSPF routers can ping interfaces of
all routers in the IGRP domain, even though there is no redistribution of
the OSPF routes into the IGRP domain.
So I start fooling with distribute lists, and proceed to make a mess. Routes
disappear. Stop that.
Well, then I do mutual redistribution with no filters. I summarize all my
longer than /24 routes so they will be redistributed into the IGRP domain.
Life is good. I can ping all interfaces of either domain from the other.
But something is nagging at me. What did I miss? Is it true that there are
NO issues in a redistribution scenario if 1) there is only a single point
of redistribution AND 2) summarization at the IGRP (or any classful domain)
occurs at the point of redistribution?
Thanks for letting me think out loud here.
Chuck
----------------------
I am Locutus, a CCIE Lab Proctor. Xx_Brain_dumps_xX are futile. Your life as
it has been is over ( if you hope to pass ) From this time forward, you will
study US!
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:26:03 GMT-3