North American Network Operators Group|
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Re: UBR at MAE-East ATM, anyone?
On Tue, 18 Apr 2000, Kevin Oberman wrote: > Alex, > > your description of how the MAE ATM NAPs work is not quite in line > with either my understanding or the ATMF traffic management specs. I'm not surprised, as I may not know what I am talking about :) > As you state, the connections to the NAPS is ABR, but you then say > "with PCR being twice SCR". If the connection is ABR (and it is), there > is not PCR or SCR. There is only MCR (minimum cell rate). This really > means that you are guaranteed that the bandwidth reserved by the > MCR will be available to you. Any traffic beyond this is treated on a > best-effort basis, exactly as if it was UBR. The only limit on what > you may inject (above MCR) is the line rate and there is no guarantee > that any of this traffic will make it through the fabric. I thought it was strange also, however my information comes from Wcom: <snip> > 3) is it still VBR, or UBR/ABR now? It's actually implemented as ABR, with the peak cell rate enforced and set to twice the reserved rate. </snip>