COMNET III

COMNET III Reports and Statistics
6.9 Burst Size Report
MESSAGE + RESPONSE SOURCES: BURST SIZE
REPLICATION 1 FROM 0.0 TO 60.0 SECONDS
ORIGIN: BURST TRAF BURST SIZE
DESTINATION LIST UNITS TYPE MIN MAX AVG STD DEV
______________________ _______ ____ _______ _______ _______ _______
Workstation 1 / src Client 1:
Workstation 2 kBits FRLB 6 56 31 0
Workstation 3 kBits FRLB 4 56 31 0
Workstation 1 / src Client 4:
Workstation 2 kBits FRLB 2 56 32 0
Workstation 3 kBits FRLB 8 56 30 0
The Burst Size Report provides statistics on the burst size measured by the traffic policy on
the protocol, when the traffic policy is present. It is the burst measurement that is used to
determine the DE status of the packet, or for the ATM traffic policy, it is the burst
measurement used to determine the conformance of the packets. Thus, a determination is
made whether the packets should be immediately dropped because they exceed their traffic
contract. There are three burst measurement options implemented for modeling the traffic
policing. The three measurements are Sliding Window, Jumping Window, and Leaky
Bucket. The burst algorithms are set in the transport protocol under traffic policing.
The Sliding Window algorithm measures the burst as the total size of the packets that arrived
during a fixed interval before the current time. This interval slides according to the time, and
the measurement always includes all the packets that have arrived for the previous full interval.
The Jumping Window algorithm measures the burst based on accumulating a burst size with
each packet, but then clearing that accumulation at fixed intervals.
The Leaky Bucket algorithm (or the Generalized Cell Rate Algorithm, GCRA for ATM) is similar
to the jumping window in terms of allowing excess traffic, except that it periodically subtracts
off an amount equal to the rate times the burst interval. This maintains some memory of the previous
burst interval, especially if that burst exceeded the value of the burst rate times the burst interval.
Burst Units
Traffic Type
The type of units set for the burst size under the traffic policing option
of the transport protocol.
The following types of traffic can be represented in this report:
FRLB - Frame Relay Leaky Bucket
FRSW - Frame Relay Sliding Window
FRJW - Frame Relay Jumping Window
ATM - ATM
NONE - (reserved)
Burst Size—Minimum, Maximum, Average and Standard Deviation
The minimum, maximum, average and standard deviation of the burst size.
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