From: BUI, TIN T (SBCSI) (tb4565@xxxxxxx)
Date: Fri Feb 16 2001 - 20:03:19 GMT-3
Hi, keep the following points in mind when using igrp default:
* the only way you can pass default on igrp is to use "ip default-network
x.x.x.x" on router A.
* For router b to see default, it must have route to the gateway of last
resort.
So my suggestion is to set ip default-network x.x.x.x on router A to another
classfull address that is not on the igrp address space. So if your igrp
address space resides in 150.30.0.0, then you want to pick a different
classful such as 192.3.0.0 or something that is different from 150.30.0.0
(maybe from the backbone or you can create a loopback on router c or some
other router in the ospf domain). Once you select this default network,
let's assume it's 192.3.0.0 from loopback0 on router c, then you want to
redistribute this network 192.3.x.0 into igrp so that router B will know how
to get to him. Make sure that when you redistribute this route, you use the
same mask as your igrp process. This should work. If you still cannot
figure it out, send me the config and I'll look at it.
> Tin T. Bui
> Senior Network Manager
> CCNP, CNE, MCP
> Network Management Center
> SBC Services Inc.
> 7337 Trade Street, Rm 1110
> San Diego, Ca 92121
> Office #: 858-886-4644/858-886-4589
> Pager #: 858-494-0482
> Fax #: 858-549-4103
> Email: tb4565@sbc.com
>
-----Original Message-----
From: Johnny Dedon [mailto:johnny.dedon@exodus.net]
Sent: Friday, February 16, 2001 12:08 PM
To: Timur_Mirza@Notes.airtouch.com; ccielab@groupstudy.com
Subject: Re: a real tricky problem w/ default route in igrp!!
the only way I know to do this is to put statement on RTR A ip default
network x.x.x.x where x.x.x.x is a classful network not already seen on
router b. This route will get propagated to B and be shown as gateway of
last resort in routing table.
Johnny Dedon
Senior Staff Consultant
Exodus Professional Services
johnny.dedon@exodus.net
www.exodus.net
----- Original Message -----
From: <Timur_Mirza@Notes.airtouch.com>
To: <ccielab@groupstudy.com>
Sent: Friday, February 16, 2001 1:33 PM
Subject: a real tricky problem w/ default route in igrp!!
>
>
> router A is an ospf/igrp router serially connected to router B, which is
igrp
> only
>
> question: how can router A feed a default route to router B (since igrp is
> classful, i cannot see
> all the vlsm, non-/24 routes on router B)
>
> now the trick is to feed a default route w/o using the following:
>
> 1) don't configure anything on router B
> 2) on router A, do not create any new networks
> 3) on router A, don't configure any default route on router A
>
> i originated a default route on an ospf only router & i could see a
gateway of
> last resort on router A,
> but it was NOT being passed to router B
>
> next, on an ospf router & also on router A, i tried configuring an ip
> default-network of a class B
> network that an ospf asbr learned as an external type II route...again, I
could
> see a gateway of
> last resort on router A, but it was NOT being passed to router B!!!
>
> lastly, on router A, i have tried to redistribute a default route into
IGRP (via
> a route-map), but
> it still is NOT being passed to router B - i have almost given up!
>
> anybody got any answers? timur
>
>
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