Right, I just mean the calculation is completely different. Tc = Bc/CIR is only relevant for shaping. Tc with policing is an entirely different concept.
On Mon, Apr 23, 2012 at 12:31 PM, Kingsley Charles < [email protected]> wrote: > 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 >> >> > -- 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
