From: Mas Kato (tealp729@xxxxxxxx)
Date: Sun Apr 29 2001 - 22:06:35 GMT-3
Russ,
Allow me to kick the corpse a little... I have not been able to get this
scenario to work, at least with 12.x. I could never get a null0 route to
install on its own when the summary's major network was the same as my
OSPF network and where its mask matched my interface leading out of
OSPF. 'show ip ospf summary' would show the summary with a very high
metric--apparently unreachable.
I'm sure your research has revealed that the documentation doesn't
support this scenario and that the, uh, "official" way to do this is to
either install a static summary route to null0 or source a default
route.
I'm so concerned with the possibility of having to defend situations
like this during the lab exam, I recently wrote to the CCIE program
about it. I asked point blank whether we could be asked to exploit
undocumented "features" of IOS behavior. We all know how porous the
documentation is--we'll see...
So how on Earth did you finally get it to work? Does it survive reboots
and such?
Regards,
Mas Kato
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Russell Lusignan
Sent: Sunday, April 29, 2001 3:48 PM
To: 'ccielab@groupstudy.com'
Subject: RE: OSPF summar-address into IGRP
Ummm... I spent a few days trying to figure this one out to no avail,
as
soon as I post to this list my problem, it works. So, by adding the
"summary-address 170.10.12.0 255.255.255.128" to R1, that subnet now
shows
up on R8. Weird. So for anyone reading my previous post about this
problem, don't worry about it :)
Too bad we don't have the ability to post to this list while doing the
actual lab :)
sorry
-Russ
> -----Original Message-----
> From: Russell Lusignan [mailto:rlusignan@birdonawire.com]
> Sent: Sunday, April 29, 2001 5:08 PM
> To: 'ccielab@groupstudy.com'
> Subject: OSPF summar-address into IGRP
>
>
> Hey group,
>
> This topic has been beaten to death, but I haven't be able to
> find anything
> in the archives on what is happening.
>
> OSPF IGRP
> ------------------R1-------------------R8
> 170.10.12.0/28 170.10.20.0/25
>
> I want the /28 to redistribute into IGRP, I know R1 won't advertise it
> because it's not a /25. I have ready many posts about people using a
> summary-address on R1 to summarize the /28 into a /25. This
> does not work
> for me. On R1, if I do "summary-address 170.10.12.0 255.255.255.128"
> shouldn't that be enough to get that /28 into IGRP as a /25?
> This works if
> I place a null0 route on R1 with a /25 manually, and I have
> managed to get a
> default-network to R8, but if these are not permitted on the
> lab, I am not
> sure how else to do it.
>
> I recall reading a post a while back where someone mentioned
> that when you
> create a summary-address in ospf it should automatically
> create a null0
> route to that subnet, I know EIGRP does this, but wasn't
> aware that ospf did
> it. When I do create a summary-address there is no null0
> route created with
> OSPF...
>
> -Russ
> **Please read:http://www.groupstudy.com/list/posting.html
**Please read:http://www.groupstudy.com/list/posting.html
**Please read:http://www.groupstudy.com/list/posting.html
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