From: edgar feliz (ejfeliz65@xxxxxxxxx)
Date: Thu Oct 25 2001 - 17:02:24 GMT-3
These numbers are what you suscribe to when you order ATM service. Your PCR is
usually your port speed, in FR/ATM this is usually the FR port speed, the SCR
is like the CIR in FR. If you configure with the PCR greater the the SCR then
you can burst, if you PCR=SCR then you can not burst.
EF
"Menga, Justin" <Justin.Menga@compaq.com> wrote: Hi
Does anybody know (preferably with URL proof) how the peak cell rate and
sustained cell rate are calculated from the bandwidth parameters you enter
in IOS configuration.
E.g.
Interface atm1/0
pvc 1/100
vbr-nrt 1920 1024 32
Above, the PCR is 1920 Kbps, the SCR is 1024 Kbps, and the Maximum Burst
Size (MBS) is 32 cells.
To calculate the actual cell rat:
Does IOS divide the bandwidth (Kbps) by 424 bits (This is a single 53-byte
ATM cell)?
OR
Does IOS divide the bandwidth (Kbps) by 384 bits (This is 48 bytes, which is
the data payload of an ATM cell)?
I just need to match up parameters with service provider equipment that
talks cell rates, not Kbps rates. (There probably is a show command that
will show me this, but I don't have access to the customer site).
Regards
Justin Menga CCIE #6640
Network Solutions Architect
Wireless & E-Infrastructure
Compaq Computer New Zealand
DDI: +64-9-918-9381 Mobile: +64-21-349-599
mailto: justin.menga@compaq.com
web: http://www.compaq.co.nz
Edgar J. Feliz
CCIE # 6898
System Engineer
Work Tel: 732-420-6131
Mobile: 201-532-8919
Email: ejfeliz65@yahoo.com
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