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Subject: Re: SV: Regional peering
From: Bill Woodcock <[log in to unmask]>
Reply-To:Network management discussion for Nordic region <[log in to unmask]>
Date:Thu, 16 May 2002 03:35:48 -0700
Content-Type:TEXT/PLAIN
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      On Wed, 15 May 2002, Fredrik Haborn wrote:
    > I understand several operators are running "hot potato" at the ix points.

Correct.  That's how BGP works by default, and how nearly all operators
actually plan their traffic flows, in order to achieve fairness with their
peer/competitors.

    > And what would the benefit be with only regional routing ?

The idea which was being expressed was that if you add more exchanges,
distributed throughout the region, the hot-potato routing which everyone's
doing will work better: more equitably, and providing better performance
to end-users.  Think of each direction of each transaction as being two
legs of a triangle.  If A is the originator of the traffic, B is the
nearest exchange which both ISPs peer at, and C is the destination of the
traffic, the distance the traffic has to travel is AB+BC.  The more points
B there are, the more nearly B will be to falling on the line AC, which
represents the optimum.

                                -Bill

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