From: Ben (bmunyao@gmail.com)
Date: Tue Sep 18 2007 - 16:16:13 ART
Eric,
Thats correct. This would be one way to filter the net 10.1.1.0 from being
advertised to the other areas.
PS:The router has to be an ABR.
Ben
On 9/18/07, Eric Leung <eric.lwc@gmail.com> wrote:
>
> 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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