[e2e] [Diffserv-interest] A question on Adaptive Protocols vs
ExpectedService Classes of Diffserv
nichols at packetdesign.com
Wed Mar 14 16:25:38 PST 2001
Kedar Poduri carried out some simulations like this quite a while back
when we were talking about something called a "virtual leased line"
built from the EF PHB described in RFC2598. This is real easy to do
(of course, you need a shaper at the edge, but Van's been saying that
since the origins of this as his "premium" service). You can look at
slide 23 of the talk at:
http://www.nren.nasa.gov/CFP/nichols_pres/index.htm, a NASA NREN
workshop on QoS.
It's supposed to "look like a wire".
> There has been vast amount of research on how TCP will react on top of
> services based on AF/AF-alike PHBs. However, I am not aware of a research
> that elaborates TCP on top of EF/EF-alike PHBs from service perspective
> (it seems this is unneccessary at all???). I am aware of that TCP is a
> widely implemented and used protocol for congestion control and
> avoidance. I assume, in a "short" time scale, TCP seems reasonable to be
> used for AF PHB-based services cause TCP-friendly traffic conditioners
> would refine the TCP's behavior. It seems to me that, may be, we need
> different adaptive protocols for different service classes (TCP has been
> developed for the "best-effort" service class). Any
> ideas/insights/comments? I appreciate very much.
> Alper K. Demir
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