From: Michael Kilpatrick (mjkilpat@xxxxxxxxx)
Date: Sun Jan 13 2002 - 23:17:51 GMT-3
Thx Scott... very creative idea using 2nd OSPF process. However, I was able
to make this work in 12.1 using the range command as long as router was an
ABR. Both with route in Area 0 and in Area 1. It appears the range works
the same way whether summarizing into the backbone or summarizing from the
backbone.... is this correct?
Mike
----- Original Message -----
From: "scott mann" <smann0762@hotmail.com>
To: <pcazou@yahoo.fr>; <ccielab@groupstudy.com>
Sent: Friday, January 04, 2002 9:57 PM
Subject: Re: OSPF summary & IOS version
> It is easy, although we have all had to work through this one.
>
> Here is the simple answer for everyone who needs to know..it seems like
this
> question gets asked every couple of days...
>
> First understand why it won't work
> 1) Area Range command is for summarizing areas INTO backbone AREA 0!
> 2) Summary Address command is for summarizing EXTERNAL or REDISTRIBUTED
> routes from outside the OSPF process running on your connected interfaces.
>
> You CANNOT summarize a connected interface which is participating in the
> main OSPF process with summary address, and since you are at a router
> running AREA 0, you cannot use the Area Range command.
>
> Solution on NEWER IOS 12.1;
>
> Create a second OSPF process;
> Router OSPF 999
> redistribute OSPF 10 subnets (MAIN OSPF PROCESS)
> summary-address x.x.x.x 255.255.255.0 (Class C or whatever you need)
>
> Redistribute second OSPF process into IGRP
> Router IGRP 10
> redistribute OSPF 999 metric x x x x x
>
> This works because you are redistributing an EXTERNAL route into OSPF 999
> (It is not active on any interface), so now you can summarize the route
into
> OSPF 999, then redistribute into IGRP.
>
> You will see the summary in the redistributing router, and the IGRP route
on
> the other router.
>
> HTH,
> Scott
>
>
> >From: Pierre Cazelles <pcazou@yahoo.fr>
> >Reply-To: Pierre Cazelles <pcazou@yahoo.fr>
> >To: ccielab@groupstudy.com
> >Subject: OSPF summary & IOS version
> >Date: Sat, 5 Jan 2002 01:17:26 +0100 (CET)
> >
> >hello group.
> >On my router, I've got a /28 interface that I announce
> >in an OSPF area 0. I wish to summarize this network in
> >/24 using OSPF.
> >On IOS 12.1(3), I use this configuration:
> >
> >interface e0
> > ip address 140.140.5.1 255.255.255.240
> >router ospf 110
> > network 140.140.5.0 0.0.0.15 area 0
> > summary-address 140.140.5.0 255.255.255.0
> > redistribute igrp 100
> >
> >After "clear ip os process", "clear ip route" and a
> >few seconds, the 140.140.5.0/24 summary route to "null
> >0" appears in routing table.
> >Note that I redistribute igrp 100, but I can take
> >whatever routing process I want (even if it doesn't
> >exist!): this command makes the router an ASBR and the
> >external LSA section appears in the database.
> >
> >This solution doesn't work for more recent IOS (I
> >tried 12.1(5) and 12.1(9)) and I have seen no
> >solution for these IOS in the archives. Anyone could
> >help me?
> >
> >
> >
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:56:27 GMT-3