From: Elias Chari (elias.chari@gmail.com)
Date: Mon Jul 03 2006 - 13:12:46 ART
Here is the RFCs guys, on which class based policing is based on
http://www.ietf.org/rfc/rfc2698.txt
http://www.ietf.org/rfc/rfc2697.txt
http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a00800d7276.shtml#topic5
On 7/3/06, David Timmons <masterdt@yahoo.com> wrote:
>
> Hi,
>
> I don't think you compute a Tc for policing. I have
> not found a link that even talks about the use of Tc
> with policing. I'll try to find a link that talks
> about the time interval. I do agree that this is the
> formula for computing the Tc for shaping.
>
>
> I wonder if the rate command is from the Car days.
> Maybe it has to be in 8k increments? I did see where
> it is used for traffic that is sent to the control
> plan.
>
> Here is an example. we are told to limit a particular
> flow to 8,000 bits/s. We are also told that the we the
> flow we are watching is 1024 bytes; however, we would
> like to allow for any size packet with a minimum burst
> size. What do you think you would list as your
> policing statement?
>
> --- Paul Dardinski <pauld@marshallcomm.com> wrote:
>
> > Dave,
> >
> > From below, tc would be cir=bc/tc, so 8000=12000/tc
> > or tc=12000/8000=1.5
> > seconds.
> >
> > Be is totally separate from the equation. The below
> > statement would
> > allow an excess burst of 16000bps over the same 1.5
> > second tc span.
> >
> > I never received any real answer as to the
> > difference of police cir vs
> > just police, so I'm assuming they are the
> > same.........
> >
> > -----Original Message-----
> > From: David Timmons [mailto:masterdt@yahoo.com]
> > Sent: Monday, July 03, 2006 10:58 AM
> > To: Paul Dardinski; Cisco certification
> > Subject: Re: Police "cir" vs police
> >
> >
> > HI,
> >
> > I have had the same questions. I am also having
> > problems understanding how the Bc is actually
> > interpreted. For example, what does this really
> > mean?
> >
> > police cir 8000 bc 1500 be 2000
> >
> > Do we use the CIR to compute a time interval? Is it
> > just 1500 per second? Do we have a way to compute a
> > time interval? I have only found a recommended value
> > for Bc and Be from Cisco:
> > normal burst = configured rate * (1 byte)/(8 bits)
> > *
> > 1.5 seconds
> > extended burst = 2 * normal burst
> >
> > Many QOS books say that policing does not really use
> > Tc the same as in shaping. I just don't understand
> > how
> > we evaluate the time period for the Bc and Be.
> >
> >
> >
> >
> > --- Paul Dardinski <pauld@marshallcomm.com> wrote:
> >
> > > I see the "police cir" command in the cco only
> > > occasionally. I can't
> > > seem to locate difference between using just
> > police
> > > command vs police
> > > cir (mqc).
> > >
> > >
> > >
> > > Any help?
> > >
> > >
> > >
> > > PD
> > >
> > >
> >
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