From: Nigel Taylor (nigel_taylor@xxxxxxxxxxx)
Date: Tue Jan 23 2001 - 21:14:42 GMT-3
Julie Ann,
I was working a lab like this over the past weekend and let
me say I've still not solved how to get the OSPF domain routed into the IGRP
domain. In my case the interface to the IGRP domain was given as
171.68.62.93/26 and all the OSPF connected interfaces were assigned address
on the 172.17.59.x subnet making use of address with /28 /29 /30 subnets.
The lab specified only the use of the 172.17.59.x. I tried the
summary-address and got nothing to work...
I'm still looking for answers.....
Nigel..
----- Original Message -----
From: Connary, Julie Ann <jconnary@cisco.com>
To: <ccielab@groupstudy.com>
Sent: Tuesday, January 23, 2001 9:37 AM
Subject: summary-address in ospf and redistribution
> Hi All,
>
> I ran across a practice lab and another fat-kid lab that use the ospf
> summary-address to overcome
> vlsm to fsm issues when redistributing ospf into igrp:
>
>
>
> situation: The ospf connected interface has a longer mask than the IGRP
> connected interface.
> area-range does not work because it is on the same router.
>
> The Fatkid lab - expert redistribution - solves this with a
summary-address.
>
> Question - does this not inject E2 routes back into your OSPF domain?
>
>
> OSPF area 2
> 170.10.128.4 - 255.255.255.192
> |
> |
> |
> R4 -----------IGRP - 170.10.2.4 255.255.255.0
>
> To redistribute the ospf interface into IGRP a summary-address is
> used: summary-address 170.10.128.0 255.255.255.0
>
> But then in the ospf domain you get an E2 route to 170.10.128.0 in your
> ospf domain.
>
> So how do you prevent this E2 route into OSPF - can you filter it?
>
> Thoughts?
>
> remember - no static, no default.
>
> Julie Ann
>
>
>
>
> ------------------------------------------------------------------------
> Julie Ann Connary
> | | Network Consulting Engineer
> ||| ||| Federal Support Program
> .|||||. .|||||. 13635 Dulles Technology Drive,
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> c i s c o S y s t e m s Email: jconnary@cisco.com
>
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