[Catching up on old threads...]
On Nov 21, 2007, at 7:59 PM, Robin Whittle wrote:
I understand (can someone confirm this?) that the CPU and memory burden on each DFZ router scales roughly in proportion to the number of prefixes multiplied by the number of peer routers, with a significant contributing factor being the number of changed advertisements. This last factor is driven by outages, permanent changes in network structure and in particular by a small subset of operators chopping and changing their advertised prefixes between different routers on an hourly or daily basis to achieve Traffic Engineering of incoming traffic.
I can confirm that. Each BGP speaker needs to store per-prefix, per- neighbor state. Implementation hacks make the amount of such state very much non-linear, so direct proportionality isn't appropriate, but those are indeed the contributing variables.
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