IGPs in use
Henk Smit
hsmit at cisco.com
Wed Oct 14 15:28:21 UTC 1998
Tony Li wrote:
>From a theoretical perspective, they both scale exactly the same. To wit:
>a two level hierarchy, with SPF within each level. Given ideal conditions,
>one could reasonably build a 160,000 router network with either protocol
>today without too much difficulty (400 nodes per area).
>
>From a practical perspective, the implementation differences and topology
>issues dominate their practical applicability.
When one compares the complexity of the SPF calculation itself,
both OSPF and ISIS scale in a similar way.
The way routing information is packaged in LSAs and LSPs is different.
They way those LSAs and LSPs are flooded is different too.
I think these difference are more important when one compares scalability
between ISIS and OSPF.
Henk.
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