Re: Comments ......

[Randy Bush <randy@psg.com>]

one lesson of internet scaling is that centralization does not scale well
and generates problems of control.  imiho, route reflectors and route
servers have this problem.  they also have the problem of making bi-
lateral, as opposed to multi-lateral, peering difficult.

let's face it.  there may be two dozen prefixes in uganda now and maybe
100 in a year or three.  given a pure layer-2 ix, each peer would have to
carry those 100 prefixes plus the default back to their external link.
you can do this with a cisco 2501, large flash and 16mb ram (though
something larger would be nice).

note that, no matter the peering point technology, that each peer
  o will have to get an as number
  o will have to announce that as number at the ix and to their upstream
  o will have to bgp announce their prefixes to the ix and to the upstream
  o will need all their routers which have external (i.e. to outside
    their own net) interfaces to speak bgp and carry default plus the
    100 ugandan prefixes

in addition, if an isp has
  o two or more major sub-sections of their net
  o which are separated by a relatively thin link
  o and one is near the ix and the other nearer the external exit
it might be advisable for each sub-section to have bgp-speaking borders,
so that packets do not trombone over the thin link.

am i making sense here?

randy

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