Area-Range command in ospf

From: ccie preparation (ccie22@gmail.com)
Date: Tue Sep 18 2007 - 10:13:14 ART

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Folks,
            I am confussed about area range command do-not-advertise option.
the documentation says

not-advertise :Sets the address range status to DoNotAdvertise. The Type 3
summary LSA is suppressed and the component networks remain hidden from
other networks.

Does it mean that the abr would block the summart and the specifics? what is
the point then?

also the default behaviour is to send the summary and specifics together?

Thanks,
Tom

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