From: Chad Marsh (chad@xxxxxx)
Date: Mon Sep 27 1999 - 13:49:44 GMT-3
Peter, the only way (as far as I know) to get a default route into an
IGRP speaking router is to use the 'ip default-network' command.
You can either put it on R1 and have it advertised, or put it on R6
directly.
It does not matter if it is the same default route that you are
propagating through your OSPF domain.
I am assuming your IGRP domain is a stub network, so all you have to do
is get it to default to anything that has a valid next hop of R1, R1 is
wise and will know the correct way to route the packet.
The 'ip default-network' must reference a classful network, and R6 must
have an entry for that classful network (not just a subnet of it) in
it's routing table.
If you don't have a candidate routing entry that meets that criteria,
here is an easy way to spoof it:
Creat a loopback on R1, (careful about affecting your OSPF RID) say
172.16.1.1 255.255.0.0, and add this network to IGRP. Then on either R1
or R6, add 'ip default-network 172.16.0.0'
That should do the trick, R6 will send unknown packets to R1, which will
then forward them to the "correct' default route.
Hope that helps,
Chad
Peter Van Oene wrote:
>
> Heres the final Config. Just an aside however, I still can't get a default
> route to hit the IGRP side :)
>
> R5
>
> router ospf 1
> network 150.100.1.6 0.0.0.0 area 1
> network 150.100.10.9 0.0.0.0 area 0
> network 150.100.10.19 0.0.0.0 area 0
> default-information originate always
> area 0 range 150.100.10.0 255.255.255.0
> area 1 nssa default-information-originate
> !
> ip classless
> ip route 0.0.0.0 0.0.0.0 150.100.10.17
> ip route 150.100.10.0 255.255.255.0 Null0
>
> R1
>
> router ospf 1
> redistribute igrp 1 subnets
> network 150.100.1.5 0.0.0.0 area 1
> network 150.100.1.250 0.0.0.0 area 1
> area 1 nssa
> !
>
> Peter Van Oene
> Senior Systems Engineer
> UNIS LUMIN Inc.
> www.unislumin.com
>
> ----- Original Message -----
> From: Richardson, Cheryl <cheryl.richardson@lmco.com>
> To: 'Peter Van Oene' <vantech@sympatico.ca>
> Sent: Monday, September 27, 1999 7:58 AM
> Subject: RE: OSPF NSSA Default;'s!!
>
> > Your welcome. So what did the final configuration look like?
> >
> > Cheryl
> >
> > > -----Original Message-----
> > > From: Peter Van Oene [SMTP:vantech@sympatico.ca]
> > > Sent: Monday, September 27, 1999 1:44 PM
> > > To: Richardson, Cheryl
> > > Subject: Re: OSPF NSSA Default;'s!!
> > >
> > > Ahhh.. That did it.. My understanding of the default-info orig statement
> > > was incorrect. Many books reference it as a redistribution oriented
> > > command
> > > which I suppose it is, but it added an ambiguity. I had thought it
> > > instructed the router to redistribute the 0.0.0.0 route to another
> routing
> > > protocol. However it obviously means redist the 0.0.0.0 route to the
> OSPF
> > > domain regardless of where the 0.0.0.0 route was learned.
> > >
> > > Thanks for your insight
> > >
> > >
> > > Peter Van Oene
> > > Senior Systems Engineer
> > > UNIS LUMIN Inc.
> > > www.unislumin.com
> > >
> > > ----- Original Message -----
> > > From: Richardson, Cheryl <cheryl.richardson@lmco.com>
> > > To: 'Peter Van Oene' <vantech@sympatico.ca>
> > > Sent: Monday, September 27, 1999 7:30 AM
> > > Subject: RE: OSPF NSSA Default;'s!!
> > >
> > >
> > > > Hi Peter,
> > > > Does R5 have a 0.0.0.0 entry in it's routing table? Have you tried
> > > the
> > > > always keyword? or even "default-information originate" under ospf 1?
> > > Not
> > > > just on the nssa statement..
> > > >
> > > > Cheryl Richardson
> > > >
> > > > > -----Original Message-----
> > > > > From: Peter Van Oene [SMTP:vantech@sympatico.ca]
> > > > > Sent: Monday, September 27, 1999 12:49 PM
> > > > > To: ccielab@groupstudy.com
> > > > > Subject: OSPF NSSA Default;'s!!
> > > > >
> > > > > Ok, 3 days before my lab and I'm going nuts:)
> > > > >
> > > > > I have the following R6 IGRP R1 Ospf R5
> > > > >
> > > > > R1 is area 1
> > > > > R5 is ABR
> > > > >
> > > > > Area 1 is nssa.
> > > > >
> > > > > I wish to propogate a default route to eventually R6, but first to
> R1
> > > from
> > > > > 5.
> > > > >
> > > > > my R5 config looks like this
> > > > >
> > > > > router ospf 1
> > > > > network 150.100.1.6 0.0.0.0 area 1
> > > > > network 150.100.10.9 0.0.0.0 area 0
> > > > > network 150.100.10.19 0.0.0.0 area 0
> > > > > area 0 range 150.100.10.0 255.255.255.0
> > > > > area 1 nssa default-information-originate
> > > > >
> > > > > However on my R1, I see no type 7 LSA for 0.0.0.0 and obviously
> > > > > no route shows up in the routing table. I'm losing my mind!
> > > > >
> > > > > Any thoughts?
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > Peter Van Oene
> > > > > Senior Systems Engineer
> > > > > UNIS LUMIN Inc.
> > > > > www.unislumin.com
> > > > >
> > > > >
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