From: Williams, Glenn (WILLIAMSG@xxxxxxxxxxxxx)
Date: Thu Mar 14 2002 - 12:09:01 GMT-3
This may be their statement, but I have seen it not work for area 0 on an
ABR and work in the situation I just spoke of. If they are saying it cannot
work on non ABR, I disagree, I saw it work. As I said it was on a router in
area 1 only. The router was ASBR also. The command was area 0 range.
Nothing else on any other routers. The route was summarized and slipped
into IGRP. Same command on ABR connecting area 0 and area 1 did not work
for route originating in area 0 that was directly attached. This is the
reality of the code and the situation.
GW
-----Original Message-----
From: Ahmed Mamoor Amimi [mailto:mamoor@ieee.org]
Sent: Thursday, March 14, 2002 9:02 AM
To: Williams, Glenn; 'Chua, Parry'; EdmondsSG@aol.com;
ccielab@groupstudy.com
Subject: Re: area 0 summarization - yes or no..
Cisco recommend to summaries the routes on the router from where it is
orginated. and always done at ABR:
from CCO:
The area range command is used only with area border routers (ABRs). It is
used to consolidate or summarize routes for an area. The result is that a
single summary route is advertised to other areas by the ABR. Routing
information is condensed at area boundaries. External to the area, a single
route is advertised for each address range. This is called route
summarization.
Multiple area router configuration commands specifying the range option can
be configured. Thus, OSPF can summarize addresses for many different sets of
address ranges
my source is :
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_r
/iprprt2/1rdospf.htm#xtocid79694
-Mamoor
----- Original Message -----
From: Williams, Glenn <WILLIAMSG@PANASONIC.COM>
To: Williams, Glenn <WILLIAMSG@PANASONIC.COM>; 'Chua, Parry'
<Parry.Chua@compaq.com>; <EdmondsSG@aol.com>; <ccielab@groupstudy.com>
Sent: Thursday, March 14, 2002 6:39 PM
Subject: RE: area 0 summarization - yes or no..
> Let me clarify on this because you may misunderstand. Not trying to
appear
> as know-it-all because I'm far from that. But I've seen this work. Go to
a
> router that is totally in area 1 (any non-zero area) and issue the command
> "area 0 range xxxx" That's right area 0 range in a router that is totally
> not in area 0. Do it for a route that originated in area 0 Watch what
> happens. You will see the summarization you are trying to create.
> GW
>
> -----Original Message-----
> From: Williams, Glenn
> Sent: Thursday, March 14, 2002 7:17 AM
> To: 'Chua, Parry'; EdmondsSG@aol.com; ccielab@groupstudy.com
> Subject: RE: area 0 summarization - yes or no..
>
>
> Not true. You can issue this command on a non ABR and it will work.
> GW
>
> -----Original Message-----
> From: Chua, Parry [mailto:Parry.Chua@compaq.com]
> Sent: Thursday, March 14, 2002 5:10 AM
> To: EdmondsSG@aol.com; ccielab@groupstudy.com
> Subject: RE: area 0 summarization - yes or no..
>
>
> I have done several test, answer is yes, you can in theory and both
> practical.
>
> (R1)-<area 1>-(R2,abr)-<area 0>-(R3,abr)-<area 2>-(R4)
> <--- (area 2, area 0 summary)
> ( area 0, area 1 summary)-->
>
> area range alwasy done at ABR....
>
> Regards
> Parry
>
> -----Original Message-----
> From: EdmondsSG@aol.com [mailto:EdmondsSG@aol.com]
> Sent: Thursday, March 14, 2002 6:34 PM
> To: ccielab@groupstudy.com
> Subject: area 0 summarization - yes or no..
>
>
> I 'm abit confused by posts at groupstudy and what I've read in a number
of
> books..
>
> Q. can you use the area XX range xxx.xxx.xxx.xxx command to summarize
> routes
> in area 0 ?
>
> some books - doyles tcp/ip vol1 /caslow say you can, but the recenet lab
> studies book says you can't !!
>
> I say that you can because i've used it in ios 12.1 and earlier to solve
the
>
> flsm to vlsm dilemma when redistributing between ospf and igrp. Maybe it
> does work but i'm missing some lurking issues that i'm not aware of yet.
> Also
> an automatic summary is now created to null0 !! i'm sure it didn't do
> that
> b4 either.....
>
> any thoughts ?
>
> Si
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