From: Sam Munzani (smunzani@xxxxxxxxx)
Date: Thu Sep 21 2000 - 16:49:07 GMT-3
Let's talk about a scenario like below.
1. Frame multipoint cloud between R1, R2, R3 is
running OSPF area 0 with /28 network. R2 & R3 uses
their s0 physical interface. No sub. int allowed.
2. Frame point-to-point between R1 & R4 is OSPF area 2
running /28. (That makes R1 a hub and other than R1
nobody should use sub int.)
3. R4's E0 is /30 network.
4. R2's E0 is connected to R6's E0. R6 also have a
token0 interface that goes to RIP backbone. Between R2
& R6 there is RIP running with /24 mask.
Do a redistribution on R1 between OSPF & RIP so
everybody can ping everwhere.
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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