From: Brian (signal@xxxxxxxxxx)
Date: Fri Aug 24 2001 - 15:09:21 GMT-3
but if it were already in OSPF, you would use area x range
and not summary-address to begin with...........
Brian
On Thu, 23 Aug 2001, Erick B. wrote:
> Folks,
>
> I know several people have discussed this here in past
> and passed this off as a hack, etc and it working in
> some versions and not others. Well, heres the scoop on
> how the OSPF summary-address changed with 12.1T and
> above.
>
> Scenario:
>
> You have an ASBR with a /30 point to point serial
> interface and classfull network on another interface.
> OSPF is active on the /30 interface. You need to
> summarize the /30 network. You decide to use
> redistribution and the OSPF summary-address method.
>
> With 12.1, 12.0, and 12.0T and earlier you
> redistribute into OSPF. The /30 interface is already
> part of OSPF and redistribution puts this same
> interface into OSPF as an external route and the
> summary route is created. Going by current
> documentation this is valid and expected. You have a
> external route coming into OSPF so OSPF creates a
> summary-address since the route matches. No hacks, no
> funky behavior.
>
> With 12.1T and above, you redistribute into OSPF. The
> /30 interface is already part of OSPF and the
> redistribution doesn't put the same interface into
> OSPF thus the summary isn't created. So, the new rule
> is with 12.1T and higher if the interface is part of
> OSPF you can't redistribute that interface back into
> OSPF.
>
> Have fun!
>
>
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