From: Eric Leung (eric.lwc@gmail.com)
Date: Tue Sep 18 2007 - 11:29:04 ART
Hi Ben,
I am also looking into this. And say I have a specific route:
10.1.1.0/24and I want to filter without using area filter-list. Can I
do this:
router ospf 1
network 10.1.1.0 0.0.0.255 area 1
area 1 range 10.1.1.0 255.255.255.0 not-advertise
Thanks,
Eric.
2007/9/18, Ben <bmunyao@gmail.com>:
>
> Hi Tom
>
> Ordinarily you use the "area range" command to summarize subnets in an
> area.
> It suppresses the specifics and sends only the summary (LSA3) to the other
> areas.
>
> "area range not-advertise" is a filtering mechanism for inter-area routes.
> You use it when the task requirement is for you to filter out certain
> specifics from being advertised to other areas, and there are restrictions
> e.g. do not use "area filter-list"
>
> HTH
>
> Ben
>
>
> On 9/18/07, ccie preparation <ccie22@gmail.com> wrote:
> >
> > 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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