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Re: Equal capacity for equal pay!
From: David Farber <dave () farber net>
Date: Sun, 31 Aug 2008 14:55:04 -0400
Begin forwarded message:
From: Tony Lauck <tlauck () madriver com>
Date: August 31, 2008 2:45:29 PM EDT
To: Bob Frankston <Bob19-0501 () bobf frankston com>
Cc: dave () farber net
Subject: Re: [IP] Equal capacity for equal pay!
There are really two questions: policy and mechanism.
The intuitive notion is that the "upload" portion of a route is sender
pays, with aggregation according to the business relationships of the
networks, while the "download" portion of a route is receiver pays,
again according to the business relationships of the networks.
Border routers should have sufficient information to classify traffic
in this fashion if a backbone provider has a single border router. In
the usual case that a backbone has multiple border routers then fine
grained implementation of this rule will require the switches inside
the network take cognizance of particular customers and their queue
priority based on usage. It might be more efficient for the customer
identity to be labeled on the packet at the ingress border router.
Queue priorities are slowly changing, so it will not require a lot of
bandwidth or processing to compute them, over and above counting
packets and binning them to customers. If, as is desirable, traffic is
counted only when it actually causes congestion, queue processors will
have to ascertain when they are congested and count packets,
allocating them to individual customers. This information will have to
be occasionally aggregated and distributed throughout an AS.
Only those networks (or portions of a network) that are likely to
become congested need congestion fairness mechanisms in their bowels.
The likelihood of congestion can be reduced by overbuilding or by
throttling packet entry to networks that do not implement proper
congestion control mechanisms.
Bob Frankston wrote:
How do you apply this rule deep in the bowels of the network where
are packets are packets?
From: David Farber [mailto:dave () farber net] Sent: Sunday, August 31,
Subject: [IP] Equal capacity for equal pay!
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