From: Arnold Ocasio (aocasio@xxxxxxxxx)
Date: Wed Nov 07 2001 - 13:29:33 GMT-3
Hello Everyone,
I've been trying to figure out this so call problem with OSPF
summary-address and redistributing a connected network that belongs to an
OSPF area that have a VLSM subnet to get to show up on an IGRP router after
redistribution with 12.1 code.
I have test in our lab the summary-address after redistributing VLSM
connected networks that belong to OSPF with the 12.1 mainline and 12.1 T
train and still works the same way it was in 12.0 code. All the routes
still show summarize to a classful subnet in the IGRP table. So, what is
the exact issue, in what code?
Regards,
============================================================================
Arnold Ocasio .. .. Cisco Systems, Inc.
Network Consulting Engineer || || 7025 Kit Creek Road
Advanced Network Services || || Lake Building
Phone: (919)392-4717 || || PO Box 14987
Fax: (919)392-5758 !||! !||! RTP, NC 27709
Pager: (800)365-4578 ...:||||||:...:||||||:... Main: (800)888-8187
aocasio@cisco.com c i s c o S y s t e m s www.cisco.com
"Empowering the Internet Generation"
============================================================================
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Ben-Shalom, Omer
Sent: Tuesday, October 30, 2001 4:33 PM
To: ccielab@groupstudy.com
Subject: RE: SOLUTION: OSPF Summary-Address (for redistrib into IGRP)
is configuring loopback addresses considered a bad form like static routes
?, if not one could place a loopback in another area which is in the range
you want to summarize then use area range on that area going into area 0,
will this produce the required summary route ?
Omer.
-----Original Message-----
From: Brian Hescock [mailto:bhescock@cisco.com]
Sent: Sun, October 28, 2001 8:36 PM
To: scott mann
Cc: kenairs@hotmail.com; kymblair@hotmail.com; gkats@algosystems.gr;
s_ravichandran@hotmail.com; w.schoots@chello.nl; ccielab@groupstudy.com
Subject: Re: SOLUTION: OSPF Summary-Address (for redistrib into IGRP)
Regarding not being able to use summary-address because of the problem
with redist connected in 12.1 and later code where the network is
already in ospf:: as long as it crosses another ospf area, use "area x
range" command and it will then summarize it to whatever you want, works
fine. But if it's in the same ospf area.... it won't work.
Brian
scott mann wrote:
> Cisco provides only one solution from it's CCO. Static route
> redistribution. It works fine on 12.1. You cannot use summary-address
> or area range to fix this issue. I tried everything while doing
> FatKids lab #501/2 and nothing works except static. I doubt the lab
> will give you a problem that has no viable solution, so just
> understand how things work and you'll be fine.
>
> The link;
>
> http://www.cisco.com/warp/public/105/52.html
>
> Scott
>
>
>> From: "kenairs" <kenairs@hotmail.com>
>> Reply-To: "kenairs" <kenairs@hotmail.com>
>> To: "kym blair" <kymblair@hotmail.com>,
>> <gkats@algosystems.gr>, <s_ravichandran@hotmail.com>,
>> <w.schoots@chello.nl>, <ccielab@groupstudy.com>
>> Subject: Re: SOLUTION: OSPF Summary-Address (for redistrib into IGRP)
>> Date: Sun, 28 Oct 2001 23:25:26 +0800
>>
>> HI Ravi ,
>> I tried that and it works fine for version 12.0 . But coming this nov
>> , the
>> routers in the lab will be loaded version 12.1 ( am i right ? ) .I try
>> redistribute connected in version 12.1 but it doesn't work. So how
>> are we
>> going to overcome this problem ? The static route to null 0 works but
>> we are
>> not allow :( .
>>
>> Regards
>> ken
>>
>> ----- Original Message -----
>> From: kym blair <kymblair@hotmail.com>
>> To: <gkats@algosystems.gr>; <s_ravichandran@hotmail.com>;
>> <w.schoots@chello.nl>; <ccielab@groupstudy.com>
>> Sent: Sunday, October 28, 2001 2:37 PM
>> Subject: RE: SOLUTION: OSPF Summary-Address (for redistrib into IGRP)
>>
>>
>> > Yorgos,
>> >
>> > Your suggestion to create a static of the /25 connected using /24
>> to null0
>> > so it matches the /24 IGRP interface to redistribute into worked
>> great.
>> > Thanks.
>> >
>> > Kym
>> >
>> >
>> > >From: "Yorgos Katsikogiannis" <gkats@algosystems.gr>
>> > >Reply-To: "Yorgos Katsikogiannis" <gkats@algosystems.gr>
>> > >To: "'Ravi'" <s_ravichandran@hotmail.com>, "'kym blair'"
>> > ><kymblair@hotmail.com>, <w.schoots@chello.nl>,
>> > ><ccielab@groupstudy.com>
>> > >Subject: RE: SOLUTION: OSPF Summary-Address (for redistrib into IGRP)
>> > >Date: Mon, 22 Oct 2001 19:32:21 +0300
>> > >
>> > >Hi Ravi,
>> > >
>> > >there is one more thing that you possibly could do to overcome this.
>> > >
>> > >You could create a static route of your *connected interface*
>> using the
>> > >major network subnet of the IGRP to a null interface (i.e if your
>> IGRP
>> > >is using /24, then you will have to use ip route xx.xx.xx.xx
>> > >255.255.255.0 null0 ) and then redistribute this static route
>> into your
>> > >IGRP routing protocol.
>> > >
>> > >You may check see that your routes are now advertised correct, but
>> the
>> > >bother is that you cannot use this kind of solution under lab
>> > >circumstances.
>> > >
>> > >Yorgos
>> > >
>> > >
>> > >-----Original Message-----
>> > >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
>> Behalf Of
>> > >Ravi
>> > >Sent: Monday, October 22, 2001 7:02 PM
>> > >To: kym blair; w.schoots@chello.nl; ccielab@groupstudy.com
>> > >Subject: Re: SOLUTION: OSPF Summary-Address (for redistrib into IGRP)
>> > >
>> > >
>> > >Hi Kym,
>> > >
>> > >If the connected interface that you are talking about is not in
>> area 0 ,
>> > >you may still use area range command on the other side of the
>> link. OR
>> > >You can do redis connected and use summary address. It works up to
>> IOS
>> > >12.0.
>> > >
>> > >I found problem when I used the same command on IOS 12.1. It does not
>> > >redistribute the connected interface if the interface is already
>> in any
>> > >of the ospf area. It works for any interface which are not in any
>> > >routing process. Try by using secondary address to overcome this
>> > >problem.
>> > >
>> > >Any one has better solution please add.
>> > >
>> > >Regards,
>> > >Ravi
>> > >
>> > >
>> > >----- Original Message -----
>> > >From: kym blair <kymblair@hotmail.com>
>> > >To: <w.schoots@chello.nl>; <ccielab@groupstudy.com>
>> > >Sent: Monday, October 22, 2001 8:54 AM
>> > >Subject: SOLUTION: OSPF Summary-Address (for redistrib into IGRP)
>> > >
>> > >
>> > > > Willy's solution to use area range at the ABR before the ASBR
>> worked;
>> > > > both became OSPF IA /24 networks and redistributed into IGRP:
>> > > >
>> > > > >If you would use an area range command on R5, then it should
>> work:
>> > > > >area 0 range 152.1.1.0 255.255.255.0 area 0 range 152.1.2.0
>> > > > >255.255.255.0
>> > > >
>> > > > Ravi's comment explains:
>> > > >
>> > > > Your R6 (ASBR between OSPF and IGRP) routing table shows both the
>> > > > network
>> > >as
>> > > > IA entry. To summarize a IA route, you can use area range
>> command on
>> > > > ABRs. Summary address to summarize routes learned from another
>> routing
>> > >
>> > > > process, and to be used on ASBRs. As your routes are IA routes,
>> > > > summary address
>> > >will
>> > > > not work.
>> > > >
>> > > > Thanks for the help; also thanks to those who offered to
>> recreate this
>> > >
>> > > > scenario on their labs.
>> > > >
>> > > > ***** This leads to one more question: ******
>> > > >
>> > > > If we had a directly connected interface on R6 (ASBR) with a
>> /25 mask,
>> > >
>> > > > how would we summarize to a /24 to get it into IGRP (static
>> works, but
>> > >
>> > > > for
>> > >this
>> > > > scenario cannot be used)? It wouldn't be an OSPF IA route, so we
>> > > > couldn't use area range at the previous ABR, and summary-address
>> > > > doesn't work (I tried).
>> > > >
>> > > > Kym
>> > > >
>> > > >
>> > > >
>> > > >
This archive was generated by hypermail 2.1.4 : Fri Jun 21 2002 - 06:45:07 GMT-3