From: Erick B. (erickbe@xxxxxxxxx)
Date: Wed Oct 24 2001 - 13:48:53 GMT-3
Hi,
If you're doing mutual redist (IGRP into OSPF and vice
versa) then the networks under IGRP will be put into
OSPF as external routes also. The summary-address is
working right.... no tricks or weird things going on.
This is probably biting you: With IOS 12.1 mainline
and earlier you can redist any route into OSPF if it
is part of OSPF already. With 12.1T and higher you
can't redist networks into OSPF as external routes if
they are already part of OSPF (intra/inter area). If
you do a debug ip ospf lsa-gen you'll see max-aged
when it tries. Earlier versions were buggy and they
fixed it in 12.1T. No sense in having the same network
in the LSDB twice, etc.
--- Jason Gardiner <gardiner@sprint.net> wrote:
> That's what I thought. Interesting that you brought
> this up, as I am
> having on hell of a problem getting it to work. My
> scenario:
>
> IGRP Segment uses a /28 from 172.17.20.0
> OSPF network uses mostly /28s from the same class B
> block. However, it
> also has a /29 and 2 /30s which, if summarized,
> would make a /28.
>
> These routes are showing up in the ASBR as IA
> routes. The summary
> command _APPEARS_ to work, but the summary address
> never appears in the
> routing table. I thought it might be because OSPF
> would not summarize
> interarea routes to an external protocol, but that
> doesn't make much
> sense.
>
> I also tried to use ip default-network, but couldn't
> get that working
> right, either.
>
> Any suggestions?
>
>
> Robert Dubell wrote:
> >
> > That is the proper way to redistribute from a OSPF
> into IGRP. Using the
> > summary-address command on the ASBR....
> >
> > -----Original Message-----
> > From: Stephen Oliver <stevie_oliver@hotmail.com>
> > To: ccielab@groupstudy.com
> <ccielab@groupstudy.com>
> > Date: Wednesday, October 24, 2001 5:01 AM
> > Subject: VLSM and IGRP redistribution
> >
> > >How many ways can you accomplish VLSM into IGRP
> redistribution.
> > >
> > >I have a router running OSPF on one interface and
> IGRP on the other. It's
> > >an ASBR. I have a class B address on both sides
> but with a /24 mask. The
> > >OSPF side is all area 0 and from another router
> in that area some /26 and
> > >/27 routes are being sent. When redistributing
> these routes into IGRP what
> > >are the options.
> > >
> > >Every book I read says the ospf command
> > >
> > ># summary-address x.x.x.x x.x.x.x
> > >
> > >is used when summarizing external routes into
> OSPF however this is the only
> > >way I can get the routes accross to IGRP. I put
> the command
> > >
> > ># summary-address x.x.x.x 255.255.255.0
> > >
> > >on the ASBR for each of the /26 and /27 routes
> and they go over to the IGRP
> > >router. A route to null 0 is created on the ASBR
> as expected but since
> > this
> > >is /24 the more specific route of /26 or /27
> takes precenence.
> > >
> > >Is this the proper way to do this ? I got the
> problem from a well known
> > >testing software page and they use the Area Range
> command which seems
> > >irrelevant in this case and does not work anyway.
> > >
> > >Thanks, Stevie.
> > >
> >
>
This archive was generated by hypermail 2.1.4 : Thu Jun 20 2002 - 22:33:24 GMT-3