这是frame-relay traffic-shapping的show traffic-shape命令输出:
To understand the concepts of traffic shaping, it is important to have a firm grasp of the
various traffic parameters in the Frame Relay network. In particular, you should know that
some (such as committed information rate [CIR] and excessive burst [Be]) are commonly
used but misunderstood.
CIR (Committed Information Rate) - The average rate at which you want to transmit. This is
generally not the same as the CIR provided by the telco. This is the rate at which you want to
send in periods of noncongestion.
Bc (Committed Burst) - The amount of data to send in each Tc interval.
Be (Excessive Burst) - The amount of excess data allowed to be sent during the first interval
once credit is built up. Transmission credit is built up during periods of nontransmission. The
credit is the burst size. Full credit is typically CIR / 8.
Tc (Committed Rate Measurement Interval) - The Bc / CIR time interval. The time interval
shouldn’t exceed 125 ms (almost always 125 ms).
MinCIR (Minimum CIR) - The minimum amount of data to send during periods of
congestion. This is usually what you get from the telco.
MinCIR - defaults to one-half of CIR.
PIR (Peak Information Rate) - The highest possible rate of transmission on any given
MIR (Minimum Information Rate) - The slowest rate of transmission on any given
Interval - Bc / CIR. The maximum is 125 ms, or 1/8 second.
Byte Increment - Bc / 8. This value must be greater than 125.
Limit - Byte Increment + Be / 8 (in bytes).