[c-nsp] ATM shaping values in IOS

Ted Mittelstaedt tedm at toybox.placo.com
Sun Sep 18 04:26:28 EDT 2005



>-----Original Message-----
>From: cisco-nsp-bounces at puck.nether.net
>[mailto:cisco-nsp-bounces at puck.nether.net]On Behalf Of Jessup, Toby
>Sent: Friday, September 16, 2005 9:54 AM
>To: cisco-nsp at puck.nether.net
>Subject: [c-nsp] ATM shaping values in IOS
>
>
>For IOS ATM shaping commands ubr, vbr-nrt, the command arguments for PCR
>or SCR/PCR are expressed as kilobits/second.
>
>I believe that in the current versions of IOS these SCR and PCR values
>are correctly set by simply matching the values provisioned by the SP
>(the policed SRC/PCR values configured by the SP, expressed in
>kilobits/second).
>
>I also have some dim recollection that in the past these values did not
>properly shape to the configured SP values when set to match the SP
>values. Instead a smaller value was needed in the IOS configuration, I
>believe a kilobits/second value matching the router's delivered payload
>rate before SAR (perhaps the AAL payload rate).
>
>Can anyone confirm that current IOS shaping commands, when configured
>correctly, do use SCR/PCR command argument values that match SP values
>(to the nearest cell)?
>
>I wish Cisco used cells/second as the values configured for these ATM
>shaping command arguments ....
>

What does the manual say?

Ted



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