From: Sam Munzani (smunzani@xxxxxxxxx)
Date: Thu Sep 21 2000 - 18:19:44 GMT-3
What is IGRP nework? If it is /28 then all /28 OSPF
routes will redistribute to IGRP without any problem.
Otherwise you will end us summarizing each network in
to same subnet as IGRP in order to make it visible to
IGRP.
Sam
--- mark salmon <masalmon@cisco.com> 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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