From: David FAHED (dfahed@xxxxxxxxxxxx)
Date: Sat Feb 03 2001 - 12:42:09 GMT-3
You are right if the 27 bits network is an isdn interface it could cause some
problems. You can prevent this external route to be advertise in the ospf
domain. But the ASBR must know this route with a redistribution of IGRP to do a
summarize of /24. If not there is no way IGRP learn this route (because of
/27).
Frank Liang wrote:
> David,
> How if this 27bit network is an ISDN on demand circuit network. will that
> cause another common problem: ISDN flapping?
> I have an impression to do Mutual IGRP/OSPF redistribution, we have to
> filter out the origin OSPF networks, so they will not become an external
> route in the database.
> Any thoughts?
>
> FL
>
> >From: David FAHED <dfahed@outremer.com>
> >Reply-To: David FAHED <dfahed@outremer.com>
> >To: "Fallon, Bill" <Bill.Fallon@getronics.com>,
> >"ccielab@groupstudy.com" <ccielab@groupstudy.com>
> >Subject: Re: IGRP Mutual Redistribution with OSPF
> >Date: Fri, 02 Feb 2001 19:45:32 -0400
> >
> >The better way for the LAB (Because you can't use static) is:
> >
> >1) Redistribute IGRP on OSPF
> >2) Show ip ospf database to verify that ospf learned the route 133.2.10.0
> >as an
> >external route
> >3) Use a summary-address 133.2.10.0/24 on ospf process
> >4) Redistribute ospf on IGRP
> >
> >Hope this help you!
> >
> >"Fallon, Bill" wrote:
> >
> > > Both Routers are using the same 133.2.x.x Network
> > >
> > > Router1->s0=133.2.10.1/27 mask: Ospf Area 0)
> > > |
> > > s1(IGRP s1=133.2.2.1/24)
> > > |
> > > |
> > > |
> > > |s0=133.2.2.2/24
> > > Router2(IGRP)
> > >
> > > IGRP Mutual Redistribution with OSPF: In order for Router 2 to ping any
> >and
> > > all non /24 networks in the OSPF cloud there are only 3 ways I know of
> >that
> > > this can be accomplished. In particular I am concerned with the
> >Directly
> > > connected S0 with a /27 mask.
> > >
> > > 1) Default network advertisded by Router 1 to Router 2
> > > 2) IP route 0.0.0.0 0.0.0.0 on Router 2
> > > 3) Policy routing--set ip hext hop or default interface)
> > >
> > > Even if you try an Area 0 summary for the subnet on this S0 interface,
> >the
> > > directly connected route will be the one that is used in the
> >Redistribution
> > > to IGRP because of the Better admin distance on a C route (And IGRP of
> > > course will ignore this route)
> > >
> > > Does any one know of any other way to get Router 2 to ping the /27
> >interface
> > > on Router 1 other then the 3 ways I have listed?
> > >
> > > Thanks,
> > > Bill
> > >
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