Re: last mile prioritization (was Re: Enterprise VoIP Peering Point? )

[Mark R. Lindsey <lindsey@e-c-group.com>]

On the topic of congestion and the questioned need for prioritization 
-- Jasleen Kaur's group at UNC-CH is studying the presence of 
congestion in the Internet. It turns out to be non-trivial to find it.

If we isolate the congestion to places that our RTP doesn't transit, 
then we're done . . . as long as our offered loads grow similarly to 
the growth of available bandwidth. Just because we have enough 
bandwidth and consistently-low delay on today's Internet doesn't mean 
we'll have it next year. If, over time, we do have congestion problems 
at significant points in the Internet, then we probably can't ignore 
it.

A related question, though -- if our bandwidth grows much faster than 
our 'need' for it grows, then are we okay? I.e., can we ever have 
enough bandwidth? Somehow I'm skeptical -- since TCP always attempts to 
use all available bandwidth. A single TCP flow attempts to create 
moderate congestion.


---
Mark R. Lindsey     Engineers' Consulting Group
Office: 229-244-2099x2207; Mobile: 229-630-5553


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