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User Guide for Cisco Security Manager 4.4
OL-28826-01
Chapter 63 Configuring Quality of Service
Quality of Service Policy Page
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, and must be in multiples of 8000.
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.
Excess Burst The excess burst size. If you select peak as the shaping type, data bursts
during an interval can equal the sum of the sustained burst value plus
this value. The average data rate over multiple intervals, however, will
continue to conform to the CIR.
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 If you do not configure this field when the CIR is defined by an
absolute value, the sustained burst value is used.
Table 63-10 QoS Class Dialog Box—Shaping Tab (Continued)
Element Description