North American Network Operators Group

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Re: OSPF multi-level hierarchy: Necessary at all?

  • From: Vadim Antonov
  • Date: Thu May 27 18:34:39 1999

Tony Li <[email protected]> wrote:

>I suspect that the main driver is not the amount of routing information
>in the gross sense, but the scalability of the protocol as the number of
>nodes increases.

There's a better solution: decrease the number of nodes by replacing
clusters with bigger boxes.  This has an additional advantage of reducing
number of hops (and, consequently, latency variance).

K.I.S.S. rulez :)


PS. Using DUAL or DASM instead of SPF helps, too -- these algorithms tend
    to eliminate updates which "do not matter" unlike SPF-based algorithms
    which have to inform everyone about local topology changes.