RE: OSPF Area

["Barry Raveendran Greene" <bgreene at cisco.com>]

If you wait until you have 50 to 100 routers in your network before you
design hierarchy into your network, then be ready for pain. Lots of pain.

With four routers and just starting with OSPF, putting everything in Area0
will work fine. But draft a scaling plan. If you start adding more routers
in the customer dial-up side, you want to design some modularity and
hierarchy into that section of the network. At that time, consider putting
the lease line module into a separate OSPF area. You do this "routing
protocol scaling path" for each part of your network. That way when you get
to 50 routers in the network you have modularity, hierarchy, and multiple
area aggregating your infrastructure addresses.

Lots of materials and examples are available at
http://www.cisco.com/public/cons/


Barry

> -----Original Message-----
> From: owner-afnog at afnog.org [mailto:owner-afnog at afnog.org]On Behalf Of
> Brian Candler
> Sent: Monday, May 20, 2002 8:27 AM
> To: joelaw at justice.com
> Cc: afnog at afnog.org
> Subject: Re: OSPF Area
>
>
> On Mon, May 20, 2002 at 08:15:09AM -0700, joelaw at justice.com wrote:
> > I have a network with a border router and three other
> > internal routers, 1 to subscriber network, 1 to NOC
> > Operations and 1 to my internal intranetwork.
> >
> > I will like to run OSPF routing on my network ... my
> > question is > do i have to configure 4 areas for my
> > OSPF cloud all will all this four subnets belong to the
> > same area 0?
>
> All your routers and networks go into area 0. You only want to start
> thinking about multiple areas when you get to 50 or 100 routers in your
> network.
>
> Regards,
>
> Brian.
>
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