How is IS-IS more scalable than OSPF? [7:5207]

[NRF]

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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