From: tom cheung (tkc9789@xxxxxxxxxxx)
Date: Fri Dec 21 2001 - 16:20:02 GMT-3
Ron,
The area range for area 0 only works on older IOS. I don't that works on
12.1, which is IOS in the lab now.
Tom
>From: "Kirby, Ron" <Ron.Kirby@getronics.com>
>Reply-To: "Kirby, Ron" <Ron.Kirby@getronics.com>
>To: "'Thomas Larus'" <tlarus@mwc.edu>, ccielab@groupstudy.com
>Subject: RE: OSPF to IGRP redistrib - How to summarize area 0 routes?
>Date: Fri, 21 Dec 2001 12:33:30 -0500
>
>The "area range" command will summarize a backbone net into an IGRP AS. I
>did a lab similar to this 2 days ago. The IGRP AS was a /24 and the frame
>network, which was the ospf area 0 was a /28. I also had /32's from some
>loopbacks that had to go into the IGRP AS as well. I played with various
>ways to do it. First, I had a Class C network hanging off another router,
>so I created a default route to that classful network on the IGRP-only
>router and I could ping everything in the OSPF system, even though the
>frame
>and loopback addresses were not in the routing table. I suspect this would
>not be acceptable though, as this is a "default-route", it just doesn't use
>the quad-zero entry in the routing table, but it does work. Next I added
>the "ip ospf network type" command to the loopbacks and used the "area
>range" command at the redistribution point, summarizing the /28 to a /24.
>The loopbacks appeared at the IGRP router as /24s, but not the /28s. I had
>to add the null route to the config on the redistribution router (as
>explained by Doyle in V1) and then it worked fine, both the loopbacks and
>the frame network (as a /24) was in the IGRP routing table. But is that a
>technical no-no, as it involves a "static route"? If this is a no-no, what
>else can you do to get /28s into an IGRP AS using a /24??
>
>Ron Kirby
>CCNP, MCSE, CNA
>Network Engineer
>Getronics, Houston ESC
>713-852-5567 / 832-256-5403
>ron.kirby@getronics.com
>
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>
>
>-----Original Message-----
>From: Thomas Larus [mailto:tlarus@mwc.edu]
>Sent: Friday, December 21, 2001 11:10 AM
>To: ccielab@groupstudy.com
>Subject: OSPF to IGRP redistrib - How to summarize area 0 routes?
>
>
>I am working on basic everyday OSPF to IGRP redistribution. I was able
>to use area range for the routes I needed to get down to /24 to match
>the IGRP domains mask. But what if the scenario had been set up
>differently, and I had had routes within area 0 that had to be
>summarized to /24 to be redisted into IGRP? Area range summarizes
>non-backbone areas INTO area 0. Summary-address only works on routes
>redistributed INTO the OSPF domain. The experts all say that there are
>two way to deal with the classless to classful redist problemstatic
>routes and summarization. If it is stated that I cannot use static
>routes, and the routes I need to summarize are within area 0, what do I
>do?
>
>I can design the network to make sure all the routes that need to be
>redistributed from OSPF to a classfull routing protocol are in an area
>other than 0, but what if I am given the situation I have set out?
>
>A route-map comes to mind, but I dont see how I can summarize using a
>route-map, although I can make it so that only routes with a certain
>mask get redistributed.
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