From: Petr Lapukhov (petrsoft@gmail.com)
Date: Tue May 16 2006 - 02:17:15 ART
Chris,
There is an interesting thing they say about 3550 policing:
http://www.cisco.com/en/US/products/hw/switches/ps646/products_tech_note09186
a00800feff5.shtml
Specifically:
---- quote
These parameters control the operation of policing:
- Rate - defines how many tokens are removed at each interval. This
effectively sets
the policing rate. All traffic below the rate is considered in profile.
Supported rates
range from 8 Kbps to 2 Gbps, and increment by 8 Kbps.
- Intervaldefines how often tokens are removed from the bucket. The
interval is fixed
at 0.125 milliseconds (or 8000 times per second). This interval cannot be
changed.
- Burstdefines the maximum amount of tokens the bucket can hold at any
time.
Supported bursts range from 8000 bytes to to 2000000 bytes, and increment
by 64 bytes.
---- quote
I wonder if they do actually use *leaky* bucket with 3550 policer and
*token*
bucket (metering) with CAR/IOS Policer..
Petr
2006/5/16, Chris Lewis <chrlewiscsco@gmail.com>:
>
> Julius,
>
> You are mixing two concwpts here. There is no Tc in policing that adheres
> to
> the shaping formula quoted. Policing does not calculate things at regular
> intervals, it calculates tokens to be credited and removed from the bucket
> based off packet arrival times.
>
> Chris
>
>
> On 5/15/06, Julius Kinsler <jkinsler@harbortech.com> wrote:
> >
> > Using the standard equation CIR = Bc / Tc where can I find the Tc when
> > trying to complete this formula?
> >
> > TIA
> > Julius
> >
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