From: John Neiberger (neiby@xxxxxxxxxx)
Date: Thu Apr 04 2002 - 01:06:08 GMT-3
That doesn't really answer why I'd want to remove it. Are you
implying that there is a way to use 'area 0 range' on an ABR
and then to remove the Null0 routes from the routing table
while still allowing the router to advertise the summarized
routes? I don't see how that would be possible.
Is this because of the 'no static route' rule? If so, I don't
think this qualifies. I haven't entered a static route into
the config at all. The OSPF area range command is simply
operating as it is designed to operate.
Or, are you saying we need to learn how to get the summarized
routes into IGRP without using the area range command *and*
without creating any null0 routes?
Am I being dense? :-) That's always a possibility, too!
John
---- On Wed, 3 Apr 2002, Jason (jgraun@attbi.com) wrote:
> Well if you want to be a CCIE you will have to learn how to
remove it.
> :)
>
>
> Jason
>
> -----Original Message-----
> From: John Neiberger [mailto:neiby@ureach.com]
> Sent: Wednesday, April 03, 2002 9:46 PM
> To: Jason; <Guy.Lupi@eurekaggn.com>; 'Warren J Dubose '
> Cc: ''Mas Kato' '; ccielab@groupstudy.com
> Subject: RE: RE: OSPF to IGRP redistribution (I know this has
been
> killed, th i s is short I promise)
>
> The mask between R2 and R4 is a /27.
>
> Why would I want to remove the null0 route after I went
through
> all that work to get it in there! :-) That's what's
allowing
> me to summarize into IGRP. Since R2 is aware of all the more-
> specific routes this isn't a problem.
>
> John
>
>
>
> ---- On Wed, 3 Apr 2002, Jason (jgraun@attbi.com) wrote:
>
> > I have had problems with that in the past, I would be very
> careful when
> > using that cause to it may not work in every case. What is
> the mask
> > between R2 and R4? Also how do you remove the null 0 route
> from the
> > routing table?
> >
> >
> > Have fun with that
> >
> > Jason
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]
On
> Behalf Of
> > John Neiberger
> > Sent: Wednesday, April 03, 2002 8:41 PM
> > To: Lupi, Guy; 'Warren J Dubose '
> > Cc: ''Mas Kato' '; 'ccielab@groupstudy.com '
> > Subject: Re: RE: OSPF to IGRP redistribution (I know this
has
> been
> > killed, th i s is short I promise)
> >
> > At this point I'm not sure who is saying what! But I'd
like
> to
> > chime in. I just did a test with three routers:
> >
> > [R3]-----(IGRP)-----[R2]-----(OSPF)------[R4]
> >
> > The R2-R4 link is in area 0. R4 has a mixture of prefixes
> from
> > 10/8 that are various lengths, all longer than /24. R3 to
R2
> > is a /24, also in the 10/8 range.
> >
> > As a test prefix I also added a /24 on R4. On R2 I turned
on
> > OSPF to IGRP redistribution and, as expected, saw only
> > the /24. I then added a loopback on R2, also in 10/8, and
> > placed it into area 1. Then, for each prefix I added
> an 'area
> > 0 range a.b.c.d 255.255.255.0'.
> >
> > And now, on R3 I see:
> >
> > R3#sho ip route
> >
> > Gateway of last resort is not set
> >
> > 10.0.0.0/24 is subnetted, 6 subnets
> > I 10.3.1.0 [100/8976] via 10.2.1.1, 00:00:04, Serial0
> > C 10.2.1.0 is directly connected, Serial0
> > I 10.1.1.0 [100/9666] via 10.2.1.1, 00:00:04, Serial0
> > I 10.1.30.0 [100/9666] via 10.2.1.1, 00:00:04, Serial0
> > I 10.1.20.0 [100/9666] via 10.2.1.1, 00:00:04, Serial0
> > I 10.1.40.0 [100/9666] via 10.2.1.1, 00:00:04, Serial0
> > R3#
> >
> > All of the above except for two were originally not /24
> > prefixes. So, at least in some cases, an area 0 range
> command
> > works just fine. If you redistribute OSPF into IGRP, IGRP
> will
> > pick up the summarized routes pointing at Null0.
> >
> > John
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