Re: Do ATM-based Exchange Points make sense anymore?

[Mike Leber <mleber () he net>]

On Fri, 9 Aug 2002, William B. Norton wrote:
> One point a couple other folks brought up during the review (paraphrasing) 
> "You can't talk about a 20% ATM cell tax on the ATM-based IX side without 
> counting the HDLC Framing Overhead (4%) for the OC-x circuit into an 
> ethernet-based IX." Since the "Effective Peering Bandwidth" is the max 
> peering that can be done across the peering infrastructure, this is a good 
> point and has now been factored into the model and analysis.

Most exchange point users terminate their exchange connections on core
routers in each geographic area so they don't experience any additional
overhead than what they would already have for their core network links.

Even after arbitrarily adding 4% conservative overhead to the gige case,
gige is still way more cost effective.

Mike.

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