From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Tue Nov 04 2003 - 14:20:14 GMT-3
At 8:50 AM -0600 11/4/03, Robert N Myhre wrote:
>Hello,
>
> I am interested to find out your experience in what the largest
>network (in terms of number of routers) that you have worked on/seen
>that is running OSPF. Is IS-IS the only real protocol if you have more
>than 30 routers?
>
>Robert
I'd need more information to give you a better idea.
Single area or OSPF routing domain ("autonomous system")?
All routers in the area including static/default redistribution, or
only those actively running OSPF processes?
Stability of links?
Route processor types/speeds?
With modern routers, I've routinely run 100 or more OSPF processes in
a single area, assuming fairly stable links. For one client, we had
about 3000 total routers in the OSPF routing domain, but roughly 20%
actually had OSPF running, the rest of the routers linked to them by
static and default routes. There were about 10 areas.
I know of one highly tuned network that is running perhaps 1000
routers in a single area. I don't know if this count includes
static/default. The person running this network is an OSPF protocol
designer as well as an administrator (i.e., "professional driver on
closed track. Do not attempt.").
For that matter, I can think of one 30,000 router network that uses
ten or so OSPF domains and a BGP backbone-of-backbones.
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