From: fwells12 (fwells12@xxxxxxxxxxx)
Date: Sat Feb 10 2001 - 21:17:30 GMT-3
I believe the area-range command is used for summarizing between OSPF areas
and the summary-address command is used to summarize external routes into
the OSPF domain. The summary-address command is only used on ASBR's which
are doing redistribution into OSPF.
----- Original Message -----
From: Scott King <scking@cisco.com>
To: Ya Wen <ywen@garcia.ME.Berkeley.EDU>; <ccielab@groupstudy.com>
Sent: Saturday, February 10, 2001 2:31 PM
Subject: Re: OSPF-IGRP Redist.
> Ya,
>
> I probably should have worded that differently. What I meant was that
> all of the routes on the OSPF network were /29 except for the two
> point-to-point subinterfaces in the FR net, which were /30. All of the
> subnets on the IGRP side were also /29, which meant that IGRP would
> recognize the /29 subnets from OSPF but not the /30s. I summarized the
> two /30s into one /29 and redistributed THAT into IGRP. After that, the
> scenario worked.
>
> OSPF summary-address is NOT only for summarizing outside routes. It is
> also for summarizing between areas--a very helpful trick. If you can
> summarize an entire area into one route, you can reduce the size of the
> routing table on the core. This is common practice. If one subnet goes
> down at the access level you won't have core routers participating in
> convergence (since they don't know about the subnet, just the supernet).
>
> Regards,
>
> R. Scott King
> Network Consulting Engineer
> Cisco Systems, Inc.
> Advanced Network Support - SP
> 9155 E. Nichols Avenue Suite 400
> Englewood, CO 80112 USA
> 919.949.8425
>
>
> Ya Wen wrote:
> >
> > Scott:
> >
> > Can you share how you summarize the OSPF route and then redistribute
into
> > IGRP domain? The OSPF summary-address command is only used to summarize
> > from outside domain into OSPF domain, am I right?
> >
> > Thanks!
> >
> > -Ya
> >
> > On Sat, 10 Feb 2001, Scott King wrote:
> >
> > > Solution to the problem was to summarize OSPF into IGRP. What a
> > > sophmoric mistake! I need to stop doing lab exercises so late at
> > > night.....
> > >
> > >
> > > Scott
> > >
> > > Sandy Thielamay wrote:
> > > >
> > > > What ip addresses are you using ? Are you using a class A and
> > > > subnetting...remember you are dealing with classful and classless
protocol.
> > > > Remember FLSM and VLSM..If you are using any of the scenario above
I would
> > > > summarize the OSPF routes on the ASBR and see what happen when it
goes into
> > > > IGRP. Make sure when you are redistributing you are following the
protocol's
> > > > metric..i.e igrp bandwith,delay etc.....
> > > >
> > > > Hope this help
> > > >
> > > > Cheers,
> > > >
> > > > Sandy
> > > >
> > > > -----Original Message-----
> > > > From: Scott King
> > > > To: ccielab@groupstudy.com
> > > > Sent: 2/9/2001 5:13 PM
> > > > Subject: OSPF-IGRP Redist.
> > > >
> > > > Hey All,
> > > >
> > > > Setup is this:
> > > >
> > > > r5---fr---r4---hdlc---r1---token---r3
> > > >
> > > > Between r5 and r4 is OSPF area 0. Between r4 and r3 (including r1)
is
> > > > IGRP AS 10. Two-way redistribution on r4. Routes attached to r3
show
> > > > up in r5's table, but I can't ping them.
> > > >
> > > > Suggestions?
> > > > --
> > > >
> > > > R. Scott King
> > > > Network Consulting Engineer
> > > > Cisco Systems, Inc.
> > > > Advanced Network Support - SP
> > > > 9155 E. Nichols Avenue Suite 400
> > > > Englewood, CO 80112 USA
> > > > 919.949.8425
> > > >
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