From: Steven Weber (itweber@xxxxxxxxxxxxx)
Date: Mon Aug 06 2001 - 14:37:56 GMT-3
what's a reverse summary address ?
----- Original Message -----
From: Paul Crist <pcrist@netsync.net>
To: Daniel C. Young <danyoung99@mediaone.net>; 'Padhu (LFG)'
<padhu@steinroe.com>; <ccielab@groupstudy.com>
Sent: Sunday, August 05, 2001 9:20 PM
Subject: Re: reverse summary-address usage
> You need to be careful with this one. I have done the 501 lab and I know
> that the solution is to use summary addresses. You should always try area
> ranges first. I am not sure why the area ranges don't work here, I
suspect
> that it has something to do with the virtual link. The route is learned
by
> IGRP because it goes through the RIP domain. Try turning off the token
ring
> interfaces that have RIP running over them and see if you still get your
> frame relay network in IGRP.
>
> Paul
> ----- Original Message -----
> From: "Daniel C. Young" <danyoung99@mediaone.net>
> To: "'Padhu (LFG)'" <padhu@steinroe.com>; <ccielab@groupstudy.com>
> Sent: Sunday, August 05, 2001 7:51 PM
> Subject: ospf: reverse summary-address usage
>
>
> > Group,
> >
> > Backgound: Some of you have advocated the use of reverse summary-address
> to
> > solve the VLSM/FLSM issue. That is, instead of using summary-address to
> > summarize external routes going into OSPF, you can use it to summarize
> ospf
> > routes into external routing domains.
> >
> > Testbed: Fatkid labs 502 and 501.
> >
> > 501 has a /28 ospf subnet that a rip domain needs to see. I configured
the
> > summary-address statement to convert it to a /24 mask on r3, who is the
> ASBR
> > for the rip domain. Works great!
> >
> > 502 has a /22 ospf subnet that an igrp domain needs to see.
> Summary-address
> > did not anywhere, except on a separate ospf process on r2, who is the
ASBR
> > for the other ospf process. This created another problem where the
longest
> > matching rule preffered the "summary" route to the null0. Nonetheless,
the
> > summary-address itself worked.
> >
> > Conclusion: Normal summary-address can summarize for longer-mask
networks.
> > Reverse summary-address can summarize for shorter-mask networks in rip.
> > Reverse summary-address does not work for longer-mask networks in igrp.
> >
> > Question: Does reverse summary-address work for shorter-mask network
igrp
> as
> > well? Can you perform a reverse summary-address for longer-mask networks
> in
> > rip?
> >
> > Regards,
> > Daniel
> > **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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