From: Richardson, Cheryl (cheryl.richardson@xxxxxxxx)
Date: Sun Dec 12 1999 - 16:47:32 GMT-3
I know it is hard to see without seeing the configs. Actually, "ip
classless" is one of the first things
I configure, in addition to "no ip domain-lookup", etc. Everything works
fine with a default route and
subnets that are not in my routing table but part of the class of network
that I know of still take the
default route. (normal "ip classless" behavior). But, when I configure an
aggregate address under
BGP, I end up with a supernet route to null0. Now subnets that are not in
my routing table but
part of the supernet route go to null0. I consider this normal behavior,
just the wrong approach on
my part.
This is what makes me think that I should have taken the area-range
approach. But I still can't
get VLSM routes to summarize within the backbone area 0.
I also tried Brian's approach of placing the area range commands on each
router within area 0
(even though I thought the command only applied to the ABRs) and it still
didn't work for me.
Has anyone actually seen this work, and possibly have working configs?
Thanks --
Cheryl Richardson
> -----Original Message-----
> From: Mark Adams [SMTP:adamsmw@earthlink.net]
> Sent: Sunday, December 12, 1999 1:37 PM
> To: Richardson, Cheryl
> Subject: Re: [sc] Classic FLSM -> VLSM issue
>
> Now, my route table has a supernet and sends all pings for the
> "unknown" VLSM subnets to the bit bucket (instead of taking my default
> route). This would imply that I made the wrong choice.
>
> I'm not an expert at this, but this sounds like a side effect of a <no IP
> Classless> configuration. The default setting of IP Classless depends on
> IOS version, so I'd start here.
>
>
> "Richardson, Cheryl" wrote:
>
> Has anyone run into the following:
>
> OSPF with VLSM subnets with mutual redistribution to IGRP. How do
> you get
> the IGRP router to
> recognize the VLSM subnets?
>
> My thoughts were that there were two choices:
> 1) Either "area range" the VLSM nets so that they are /24 when they
> hit
> IGRP.. or
> 2) Do the "ip default-network" thing
>
> Since I had /28 subnets in area 0 (which is where the redist occurs)
> and did
> not feel that area 0 routes could be
> summarized and effect IGRP (I know that the summaries could apply to
> the
> other areas), I chose "ip default-network".
>
> Great, everyone can ping everyone. Then along comes BGP on the IGRP
> router
> and I am asked to create
> a supernet for all the routes to send to the EBGP router. Now, my
> route
> table has a supernet and sends all pings
> for the "unknown" VLSM subnets to the bit bucket (instead of taking
> my
> default route). This would imply that
> I made the wrong choice. But, how can you summarize within area 0?
> summary-address applies to redistribution
> from the outside protocol into OSPF. Is there another choice that I
> am
> missing?
>
> Thanks for any help!
> Cheryl Richardson
>
> --
> To unsubscribe: echo unsubscribe cisco-cert | mail
> majordomo@cciecert.com
>
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:21:59 GMT-3