Token Bucket Burst-Size Values

From: Scott Stoddard (scott@gblx.net)
Date: Wed Jul 30 2003 - 17:10:40 GMT-3

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Hi all, I am trying to understand token bucket rate values and how they affect
overall performance.

I am working from the formulas:
normalBurst=((RTT*rate)/8)
extendedBurst=2*normalBurst

Question 1: If standard rate-limits were defined using an average round trip
time (RTT) of 150ms to calculate the normal burst value. Would this be
detrimental to the performance of a circuit if the actual RTT time on a link
was 10ms? If so why or why not?

Question 2: Again if standard policer/rate-limits were defined and the
extended burst value was used for the normalBurst values (so the values are
the same). I am told that as long as the normal burst is somewhere between the
ACTUAL normalBurst and extended burst that it would perform the same, but this
doesn't sound right to me...would this be bad in any way?

Thanks!
--Scott

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