North American Network Operators Group|
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Re: IGPs in use
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.