[c-nsp] OSPF area design question

[Marcel Lammerse]

Hi,

I have a hub-and-spoke network, for which I'd like to use OSPF as a
routing protocol. The spoke sites will advertise their networks to
the hub and receive a default route from the hub.

A common piece of advice in OSPF design literature, is to use different
area numbers to prevent unnecessary LSA updates from flooding to routers
that don't need the updates and to avoid the cpu processing overhead.

The total network has some 50 routers.  There are 3 inter-connected hubs
and some 15 routers per hub. The way I see it, I can do two things:


1. 	assign a lot of area numbers to prevent the LSAs from propagating
	through to routers that don't need them. However, this leads to a
	relatively complex configuration.

2.	accept the, potentially small, bandwidth waste and don't care
	about the cpu overhead (we're talking 2600XMs here).

Option 1 just doesn't seem worth it. Could someone provide some advice,
experience or tips?

Thanks.

-Marcel