Re: [nsp] ATM PVC Shaping Question

From: Petri Helenius (pete@kpnqwest.fi)
Date: Fri Jun 09 2000 - 11:52:07 EDT


sthaug@nethelp.no wrote:
>
> > Does a Cisco router using PA-A3 hardware (or NPM-ATM) shape vbr-nrt traffic
> > based on the cell rate or the payload rate?
>
> Cell rate, in our experience. Ie. if you want 36 Mbps payload, you'd
> specify 36000*53/48=39750.
>
You need more to accommodate AAL5SNAP headers (if used) and empty parts
of the cells.

Usually a multiplier between 1.15 and 1.18 is appropriate with Internet-like traffic.

Pete

> I dearly wish Cisco would let us specify cells per second - that would
> be nice and unambiguous.
>
> Steinar Haug, Nethelp consulting, sthaug@nethelp.no



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