Policing and Tc

Hi,

I have been reading the Cisco QoS CCVP Exam Certification Guide to study my
QoS for CCIE and going through explanations in online blogs etc.

I am getting a bit confused because in my QoS Book it states that the
Policer doesn't use a Time Interval to replenish the Token bucket but the
formula is worked out as I understand it...

Time passed between packets arriving on an interface.. * Police Rate (In
bps) / 8..

So if you had a police rate of 128,000bps and time between packets arriving
on an interface was 100ms then the Token bucket would get replenished with
1600 tokens.. Based on the following math

0.100*128000/8 = 1600 Tokens..

So now if the Token Bucket was set to 2000 bytes Bc with no excess burst
configured then how does the above math work for the new scenario and what
are the benefits of having a smaller token bucket with policing? I dont
understand the theory behind this.

Many thanks,

Garth

Blogs and organic groups at http://www.ccie.net
Received on Mon Mar 01 2010 - 17:58:02 ART