Good Question!
I have read that IS-IS can accept more nodes than OSPF. Yet, I find that
Juniper is pushing IS-IS and the US Govt has some networks on IS-IS. Black
in the IP Routing Protocols basically states it is an IP Protocol but is not
used in the internet or much elsewhere for that matter.
In Priscilla's Top-Down Network Design book on page 236 shows the
scalability of OSPF to about 50 routers per area and about 100 areas and
the IS-IS 1,000s of routers.
In Sam Halabi's book Internet Routing Architectures on page 100 .....Today,
both IS-IS and OSPF are widely deployed in ISP Networks. The maturity and
stability of IS-IS has resulted in it remaining deployed in large networks,
as well as its being the IGP of choice for some recently deployed networks.
In Catherine Paquet and Diane Teare's book Building Scalable Cisco Networks
on page 23 is a Table comparing OSPF, IS-IS and EIGRP. Basically IS-IS wins
out for Scalability.
Sorry I can not be of more help.
Curtis
Curtis Rose
----- Original Message -----
From: "NRF"
To:
Sent: Sunday, May 20, 2001 10:24 PM
Subject: How is IS-IS more scalable than OSPF? [7:5207]
> Hello
>
> Several people have asserted that IS-IS (for IP) has demonstrated more
> scalability than OSPF. What accounts for this? I have heard that it has
> to do with IS-IS being able to take advantage of Partial-route Updates
when
> IP information changes, as opposed to running Dijkstra all the time, is
that
> the only factor, or are there other reasons?
>
> Thanx
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