Correct. -- Marko Milivojevic - CCIE #18427 (SP R&S) Senior CCIE Instructor - IPexpert
On Thu, Apr 12, 2012 at 15:34, Bal Birdy <[email protected]> wrote: > Les et al, > > Thank you for getting back to me. The core concept I understand, but what > was confusing me was defining Tc through the adjustment of Bc (Bucket > Size). After some further reading my understanding is that 1. IOS has the > defaults as I've previoiusly stated but 2. dependent on the traffic type it > may be beneficial to adjust the Tc i.e. lower Tc for voip type traffic and > 2. higher Tc for burstier traffic types e.g. TCP streams. > > Thoughts? > > Point being there is no right and wrong answer, the Tc merely governs how > often your sampling end result is you always hit your shaping rate within > the second, but your bucket size means more tokens which means for packets > in any one hit. > > Thanks > B > > On Thu, Apr 12, 2012 at 10:57 PM, Les Waller <[email protected]> wrote: > > > Let me respond within your email... > > > > On Thu, Apr 12, 2012 at 10:53 AM, Bal Birdy <[email protected] > >wrote: > > > >> Hello Experts, > >> > >> Need some guidance please on QoS with respect to shaping and Tc/Bc/Be > >> values. I just need to confirm what i'm reading and the way im > >> interpreting > >> it. > >> > >> 1. CIR <= 320 Kbps: > >> > >> If I'm shaping below 320 Kbps my Bc/Be values will always be 8000 bits, > >> with the Tc calculated using Tc=Bc/CIR > >> > > > > Your Tc will be determined by your value of the Bc. > > > > The CIR is the total data to pass in one second. The Bc is the data that > > will pass in one slice of time for x number of times per second. > > > > Let's say you have a pizza that is 16 inches in circumference. If the Bc > > is 2 inches then it will take 8 pieces of pizza to make a whole. If the > Bc > > is 8 inches, then it will only take 2 pieces to make a whole. > > > > Put another way, it takes an hour to eat a pizza. You won't eat the whole > > thing at one gulp, so you break it into pieces (bursts). So the pieces > are > > 2 inches in size then you can eat eight pieces each 7.5 minutes apart or > > you can eat two 8 inch pieces 30 minutes apart. > > > >> > >> 2. CIR >= 320 Kbps > >> > >> If I'm shaping above 320 Kbps, my Tc is always 25ms, my Bc = shaping > rate > >> * > >> Tc and my Be = Bc > >> > >> Thanks > >> Bal > >> _______________________________________________ > >> 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 <http://www.platinumplacement.com/> > >> > >> http://onlinestudylist.com/mailman/listinfo/ccie_rs > >> > > > > > > > > -- > > Les Waller, Network Engineer > > > > Home Page: www.leswaller.com > > > > MBA, CISSP, CCNP > > > > > _______________________________________________ > 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 > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > _______________________________________________ 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 http://onlinestudylist.com/mailman/listinfo/ccie_rs
