Cisco Systems OL-16066-01 appendix Cir, 218

Appendix K Router Platform User Interface Reference

Quality of Service Policy Page

Table K-97 QoS Class Dialog Box—Shaping Tab (Continued)

Type	The type of shaping to perform:
	• Average—Limits the data rate for each interval to the sustained burst
	rate (also known as the committed burst rate or Bc), achieving an
	average rate no higher than the committed information rate (CIR).
	Additional packets are buffered until they can be sent.
	• Peak—Limits the data rate for each interval to the sustained burst rate
	plus the excess burst rate (Be). Additional packets are buffered until they
	can be sent.
CIR	The average data rate (also known as the committed information rate or
	CIR). You can define this amount by:
	• Percentage—Valid values range from 0 to 100% of the overall available
	bandwidth.
	• Bit/sec—Valid values range from 8000 to 1000000000 bits per second.
	Although data bursts during an interval may exceed this rate, the average
	data rate over any multiple integral of the interval will not exceed this rate.
Sustained Burst	The normal burst size. If you select average as the shaping type, data bursts
	during an interval are limited to this value.
	The range of valid values is determined by the CIR:
	• When the CIR is defined by percentage—Valid values range from 10 to
	2000 milliseconds.
	• When the CIR is defined by an absolute value—Valid values range from
	1000 to 154400000 bytes, in multiples of 128 bytes.
	Note We recommend that you leave this field blank when the CIR is
	defined by an absolute value. This allows the algorithms used by the
	device to determine the optimal sustained burst value.

	User Guide for Cisco Security Manager 3.2
K-218	OL-16066-01