[nsp] Advantages of IS-IS over OSPF

From: Steve Lilley (slilley@thrupoint.net)
Date: Wed Sep 06 2000 - 22:57:59 EDT


Is there some advantage that IS-IS offers over OSPF for ISP
backbones? I can't find anything documented...in fact, I can find
VERY little documentation on IS-IS. This is quite a contrast to
OSPF, where there is actually more information than I could ever
want! :-)

>From what I can tell, the biggest advantage for IS-IS is the fact
that the backbone area is more flexible than OSPF's area 0. With
IS-IS's two-tiered approach, the backbone can "snake" around the
network easier than OSPF's area 0. Beyond that, I don't see many
advantages. Since IS-IS is multiprotocol by design, it may
initially support newer non-IPv4 protocols (i.e. multicast, IPv6,
etc.) before OSPF, but that won't be tolerated for long by the
huge number of OSPF customer's out there!

As always, and feedback is appreciated!

Regards,
Steve Lilley
ThruPoint



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