Multi-homed implementation and BGP convergence time

Kevin Loch kloch at
Fri Sep 11 23:19:22 UTC 2009

Seth Mattinen wrote:
> Jay Hennigan wrote:
>> "Tier 1", "tier 2" etc. are terms used primarily by salespeople, and
>> don't have a lot to do with technical matters.
> Sure it does. If you're multihoming it will increase your AS path length.

There is no general correlation between AS path length and whether
or not a network pays to exchange traffic.

There is a noticeable correlation between cost and local-preference,
as-path prepending, metric setting and other ways networks control
how they send you traffic.  This is affected by peering selectivity
as well as transit prices.

- Kevin

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