From: scott mann (smann0762@xxxxxxxxxxx)
Date: Fri Jan 04 2002 - 23:57:54 GMT-3
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 - 10:56:16 GMT-3