From: Tony Olzak (aolzak@xxxxxxxxxxxxxxxxxxx)
Date: Thu Sep 21 2000 - 13:56:17 GMT-3
Julie Ann,
I'm pretty sure you have to configure IGRP on both routers to forward that
default info. For example, now that you have configured a default network on
Router A, add these lines:
default-information out 1
!
access-list 1 permit any
and on Router B:
default-information in 1
!
access-list 1 permit any
That should let the default-network command on router A propagate to router
B.
Tony
----- Original Message -----
From: "Connary, Julie Ann" <jconnary@cisco.com>
To: "mark salmon" <masalmon@cisco.com>
Cc: <ccielab@groupstudy.com>
Sent: Thursday, September 21, 2000 10:20 AM
Subject: Re: Redistributing OSPF into IGRP
> Hi,
>
> Can anyone post configs for the ip default-network method. I cannot seem
to
> figure it out. Thanks.
>
> I re-read Caslow and he gives two options to solve this problem:
> summarization with a static to null 0 and using ip defulat-network with
> ip-classless. I got the first to work in the lab, no problem. The second
> however is causing me problems.
>
> I tried to make an ip default-network to 172.17.59.0 on the router a, but
> what I got in the config was a static route:
>
> router igrp 100
> redistribute ospf 1 metric 64 10 255 1 1500
> passive-interface Loopback5
> network 172.17.0.0
> !
> ip classless
> ip route 172.17.0.0 255.255.0.0 172.17.59.0
>
> Then I tried to make and ip default-network to 172.17.0.0. now I have a
> candidate default route in my routing table on router a, but
> router b is not getting the default-route and I can still not get to the
> 172.17.59.0 networks in ospf:
> version 11.2
> no service udp-small-servers
> no service tcp-small-servers
> !
> hostname r1
> !
> !
> no ip domain-lookup
> !
> interface Loopback0
> ip address 1.1.1.1 255.255.255.0
> !
> interface Loopback1
> ip address 172.17.59.33 255.255.255.240
> !
> interface Loopback2
> ip address 172.17.59.49 255.255.255.240
> !
>
> interface Loopback3
> ip address 172.17.59.65 255.255.255.192
>
> interface Loopback5
> ip address 172.17.45.1 255.255.255.0
> !
> interface Ethernet0
> no ip address
> shutdown
> !
> interface Serial0
> ip address 172.17.60.2 255.255.255.0
> !
> interface Serial1
> ip address 193.1.1.1 255.255.255.0
> !
> interface BRI0
> no ip address
> shutdown
> !
> router ospf 1
> redistribute igrp 100 metric 64 subnets
> network 172.17.59.32 0.0.0.15 area 0
> network 172.17.59.48 0.0.0.15 area 2
> network 172.17.59.64 0.0.0.63 area 3
> !
> router igrp 100
> redistribute ospf 1 metric 64 10 255 1 1500
> network 172.17.0.0
> !
> ip classless
> ip default-network 172.17.0.0
> !
> line con 0
> line aux 0
>
> line vty 0
>
> line vty 1 4
> !
> end
>
>
> routing table on router a:
> Gateway of last resort is not set
>
> 1.0.0.0/24 is subnetted, 1 subnets
> C 1.1.1.0 is directly connected, Loopback0
> * 172.17.0.0/16 is variably subnetted, 5 subnets, 3 masks
> C 172.17.60.0/24 is directly connected, Serial0
> C 172.17.45.0/24 is directly connected, Loopback5
> C 172.17.59.32/28 is directly connected, Loopback1
> C 172.17.59.48/28 is directly connected, Loopback2
> C 172.17.59.64/26 is directly connected, Loopback3
> C 193.1.1.0/24 is directly connected, Serial1
>
> routing table on router b:
>
>
> Gateway of last resort is not set
>
> 172.17.0.0/24 is subnetted, 2 subnets
> C 172.17.60.0 is directly connected, Serial0
> I 172.17.45.0 [100/8976] via 172.17.60.2, 00:00:12, Serial0
>
> I put the 172.17.45.0 loopback interface on router a, just to make sure I
> was getting routes distributed via IGRP.
>
> Can anyone post configs that work for the ip default-network method.
>
> Thanks Julie Ann
>
>
> At 04:52 PM 9/20/2000 -0700, mark salmon wrote:
> >I still disagree with the blanket statement about static routes. If you
> >want to summarize OSPF you have to use static routes (null 0). I still
> >believe that you can do so as long as you are using summarization.
> >
> >One method that is recommended by Caslow is to use a static route to
> >null 0 with the same mask as the IGRP net.
> >
> >For example, suppose the masks on the IGRP networks is /24, but it
> >varies on the OSPF net.
> >
> >On the ASBR, you can do 172.17.x.0 255.255.255.0 null 0 (be careful
> >here, if you have a dynamic route for x you will pass packets into a
> >black hole, the key is to have good network design to prevent this). If
> >you already have a 172.17.x.0/24 network, then I would create a class c
> >subnet (e.g. 198.135.244.1/24) on a loopback interface, either
> >redistribute it into IGRP or advertise it in IGRP. Then make it the
> >default network for IGRP.
> >
> >Comments group (Flame jacket on for this).
> >Mary Weidner wrote:
> > >
> > > All,
> > >
> > > I am working on a practice lab on one of the midwest channels racks
and
> > am having a problem with redistribution. Here's a sample config:
> > >
> > > Router A
> > > !
> > > router ospf 100
> > > network 172.17.59.32 0.0.0.15 area 0
> > > network 172.17.59.48 0.0.0.15 area 2
> > > network 172.17.59.64 0.0.0.63 area 3
> > > redistribute igrp 100 metric 64 subnets
> > > !
> > > router igrp 100
> > > network 172.17.0.0
> > > redistribute ospf 100 metric 64 10 255 1 1500
> > >
> > > Router B
> > > !
> > > router igrp 100
> > > network 172.17.0.0
> > > !
> > >
> > > Here's the deal, IGRP does not understand VLSM which is what is being
> > used on router A with OSPF. From all the docs I've read, you would have
> > to put in static routes on Router B to tell it how to get to those other
> > subnets, except I'm not allowed to use static routes. The subnets in
OSPF
> > on Router A are not redistributing into IGRP. They come out as
172.17.0.0
> > instead of whatever the real network number is.
> > >
> > > Here's the other thing I tried; I added these lines:
> > >
> > > Router A
> > > !
> > > router ospf 100
> > > default-information originate always
> > > !
> > > router igrp 100
> > > default-information allowed in 1
> > > default-information allowed out 1
> > > !
> > > access-list 1 permit any
> > >
> > > Router B
> > > !
> > > router igrp 100
> > > default-information allowed in 1
> > > !
> > > access-list 1 permit any
> > >
> > > The thinking here was to originate a default route (0.0.0.0) from
> > Router A in OSPF and try to redistribute this into IGRP..... it didn't
> > work. Maybe I just configured it wrong or maybe it's just not possible.
I
> > don't know. This is the second time I've attempted to get this working
to
> > no avail. Let me know if you have any ideas.
> > >
> > > Thanks,
> > >
> > > Tony Olzak
> > >
> > > BTW-I've just joined the list. I'm scheduled to take the test on Nov
> > 19-20 in RTP.
> > >
> > >
> > >
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