From: Cox, Bryan (bryan.cox@xxxxxxxxxxxxxx)
Date: Sun Apr 01 2001 - 19:16:00 GMT-3
John-knee,
When you do the "redistribute connected" on the router with the router
running OSPF with the /27, is this based on the assumption that your network
statements on that router do not include the /27 range. Thus this external
network is summarized as it is imported into OSPF by the "summary-address"
command. Thus the remainder of the OSPF area 0 sees the route as as /24.
When the summarized /27 (now a /24) reaches the IGRP/OSPF redistributing
router it passes into IGRP without problem.
When I worked with OSPF last weekend I had a similar experience to what Alan
reported. If I took the /27 and made it an active OSPF interface in area 0
I could not summarize it with the "summary-address" command. If carved the
/27 into a separate area then I could summarize it at the ABR with an "area
x range y" command.
Bryan
-----Original Message-----
From: da_johnny_g_string [mailto:da_johnny_g_string@yahoo.com]
Sent: Friday, March 30, 2001 2:06 AM
To: 'Alan Basinger'
Cc: groupstudy (E-mail)
Subject: RE: OSPF area 0 VLSM summarization
Alan,
redistribute connected ive found works then do a summary-address to get it
the /27 to a /24 BUT make sure you filter only the /27 n/w to be
redistributed :) via either distribute-list x out connected or route-map
when redisributing
p.s im doing mine on monday as well but in australia/sydaney
cheers
Regards John-knee
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Alan Basinger
Sent: Friday, 30 March 2001 12:47 PM
To: ccielab@groupstudy.com
Subject: OSPF area 0 VLSM summarization
Hi all,
Well Mondays the day and I am working on area x range and summary-address
commands in OSPF. I have found that I can easily summarize area's other than
area 0 internal to OSPF and also when redistributing into other protocols
i.e.: IGRP.
Now for the fun part. If lets say your area 0 frame cloud is a /27 and you
need to be able to ping it from IGRP which is a /24 how would you summarize
the /27 in area 0?
Personally I like ip default-network x.x.x.x but if your unable to use it
what would you do?
An idea I had was to create a /24 static to null0 and redistribute it to
IGRP but if you cannot use any static's then what????
Maybe I'm just freaking out but it has me kind of worried.
Thanks,
Alan
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