North American Network Operators Group
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Re: how is cold-potato done?

  • From: Jared Mauch
  • Date: Wed Jun 26 14:02:30 2002 
On Wed, Jun 26, 2002 at 01:52:08PM -0400, Ralph Doncaster wrote:
> 
> If I peer with network X in cities A and B, and receive the same route in
> both cities with an AS-path of X, how do I know which city to use for an
> exit?  I can understand how if X uses communities to tag the geographic
> origin of the traffic, but I'm not aware of many networks that do
> this.  Lots of networks claim to use cold-potato routing though, so how do
> they do it?

	they use the MED sent on the route (aka metric) from the
other provider to determine which exit where they both interconnect
is the "shortest".

	this can at times provide undesired results because of
aggregation.

	- jared

-- 
Jared Mauch  | pgp key available via finger from [email protected]
clue++;      | http://puck.nether.net/~jared/  My statements are only mine.