Tc is involved in both shaping and policing. With policing, Tc is the seconds for which tokens are put in the bucket.
With regards Kings On Mon, Apr 23, 2012 at 7:26 PM, Joe Astorino <[email protected]>wrote: > The forumulas for calculating the Bc and Be for policing are how you have > defined, them but I would be careful with the use of the term "Tc" when > dealing with policing. Tc is generally a term that applies to traffic > shaping and not traffic policing. Why? What does Tc do for us? With a > shaper, Tc is a static defined interval of time. As you know, each Tc > interval we get to add Bc tokens to the bucket to use. Traffic policing > does not work the same way, contrary to popular belief. With traffic > policing, the token bucket is refreshed based on a function of 2 things: > The CIR value and the amount of time passed since the last packet was > received. It has nothing to do with Tc. > > My point is simply that Tc is not involved with the calculations of > traffic policing, as it is a concept that applies to traffic shaping. > > On Sun, Apr 22, 2012 at 12:32 PM, Kingsley Charles < > [email protected]> wrote: > >> Hi all >> >> The following is how we calculate Bc for QoS MQC policing and TCP >> rate-limiting. Now for ZPF policing, which formula should be used. I need >> Cisco doc for confirmation. >> >> >> Policing >> ======== >> >> Tc = 0.25 secs >> >> BC = CIR/8 * 0.25 = CIR/32 >> >> Be = Bc, if not specified >> >> >> TCP Rate-limiting >> ============= >> >> Tc = 1.5 secs >> >> BC = CIR/8 * 1.5 >> >> BE = 2 BC >> >> >> With regards >> Kings >> >> _______________________________________________ >> For more information regarding industry leading CCIE Lab training, please >> visit www.ipexpert.com >> >> Are you a CCNP or CCIE and looking for a job? Check out >> www.PlatinumPlacement.com >> > > > > -- > Regards, > > Joe Astorino > CCIE #24347 > http://astorinonetworks.com > > "He not busy being born is busy dying" - Dylan > >
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
