Wednesday, May 16, 2018

calculating correct burst values?

I'm studying the CCNP SP track.

In the study guide for the Core exam I am going over token bucket policing it states:

When you define custom burst sizes, for optimum performance use this formula to determine the burst value:

Bc (= CIR bps* (1 byte / 8 bits)* 1.5 seconds

There are also post on Cisco Support forums saying similar things.

https://learningnetwork.cisco.com/thread/53215

What I don't understand is the purpose of the 1.5seconds and where it comes from because at first it seemed to me that the Bc would exceed the actual interface speed.



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