[c-nsp] ospf route summarization on non-abr routers

[nasir.shaikh at bt.com]

Hi,
When you use the area 1 range x.x.x.x x.x.x.x command you are
summarizing the subnets in area 1 when advertising to another area
(usually the backbone area). So this is only effective on an ABR.

The summary-address command is used to summarize external routes on an
ASBR.

Afaik, "changing" the route-type from external to internal is not
possible and if it were possible using some hack it would be devastating
for your OSPF database.
You could however configure a loopback with the subnet that you want and
assign that network in an area within OSPF. You would still need other
steps (static routes) on the edge to achieve reachability. I fail to
understand the purpose of this exercise.


Nasir Shaikh 

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Tassos
Chatzithomaoglou
Sent: woensdag 3 januari 2007 20:59
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] ospf route summarization on non-abr routers

I'm trying to configure some summarization under ospf, but i have come
into the following problem.

Inter-area route summarizations are created on an ABR using the
following command under the ospf 
process:

Router(config-router)#area 1 range 172.16.0.0 255.255.0.0


External route summarization is done on an ASBR using the following
command under the ospf process:

Router(config-router)#summary-address 172.16.0.0 255.255.0.0


When i try to summarize some routes on an "edge" (not ABR) router of an
area (don't ask me why):

1) using the "range" command doesn't do anything (is this normal?)
2) using the "summary" command makes them external-2 (this seems normal)

So is there a way i can summarize routes on non-abr routers and make
them appear as internal?



-- 
Tassos
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