IP Bandwidth Sharing. Paul Ferguson Consulting Engineer Internet Architecture Office of the CTO [email protected] 1. What exactly is “bandwidth sharing”?. Bandwidth sharing:.
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RSVP has some minor scaling concerns, when individual flows using RSVP grow beyond a few hundred (or perhaps a few thousand). This concern may be somewhat alleviated in the near future with an RSVP reservation aggregation scheme.
Well, RSVP gives you a bound on end-to-end maximal queuing times which basically bound delay for flows. But it really doesn’t provide for jitter control. It does, however, “protect” flows and guarantee bandwidth.
Diffserv’s EF PHB, I believe, parallels the Intserv controlled-load service.
TDM -- Remember what TDM stands for? There really is no delay or jitter in a TDM world -- everything is timing and timing rates. Basically, this has become an unrealistic (my opinion) standard for VoIP -- hard delay & jitter “guarantees”.
Diffserv EF & AF PHB: No guarantees on delay or jitter. Semi-soft and squishy “guarantees” on delay, respectively. Jitter still elusive insofar as guarantees are concerned, but with EF jitter is less of a concern. AF jitter probability is directly related to priority ordering.