From: Petr Lapukhov (petr@internetworkexpert.com)
Date: Mon Jul 03 2006 - 13:05:39 ART
Hello,
Here "police cir" defines two-rate, three color policer.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hqos_c/part20/ch05/h2rtplc.htm
Next, "police" is basic single-rate, three color policer.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hqos_c/part20/ch05/hpoli.htm
In comparsion, "police cir" behaves completely like
"police" if "peak-rate=rate". That is, "police" is a bit
obsolete command.
Finally, "police rate" is for control plane policing
(specified in bitrate/pps).
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hqos_c/part20/ch05/hrtlimt.htm
HTH
-- Petr Lapukhov, CCIE #16379 petr@internetworkexpert.comInternetwork Expert, Inc. http://www.InternetworkExpert.com Toll Free: 877-224-8987 Outside US: 775-826-4344
2006/7/3, David Timmons <masterdt@yahoo.com>: > > 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 > > > > > > > > > _______________________________________________________________________ > > > Subscription information may be found at: > > > http://www.groupstudy.com/list/CCIELab.html > > > > > > > > > > > > > > > __________________________________________________ > > Do You Yahoo!? > > Tired of spam? Yahoo! Mail has the best spam > > protection around > > http://mail.yahoo.com > > > > > _______________________________________________________________________ > > Subscription information may be found at: > > http://www.groupstudy.com/list/CCIELab.html > > > > > > > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html
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