C
HAPTER
11
| Quality of Service
Creating QoS Policies
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Exceed – Specifies whether traffic that exceeds the maximum
rate (CIR) but is within the excess burst size (BE) will be
dropped or the DSCP service level will be reduced.
■
Set IP DSCP – Decreases DSCP priority for out of
conformance traffic. (Range: 0-63)
■
Drop – Drops out of conformance traffic.
■
Violate – Specifies whether the traffic that exceeds the excess
burst size (BE) will be dropped or the DSCP service level will be
reduced.
■
Set IP DSCP – Decreases DSCP priority for out of
conformance traffic. (Range: 0-63)
■
Drop – Drops out of conformance traffic.
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trTCM (Police Meter) – Defines the committed information rate
(CIR, or maximum throughput), peak information rate (PIR), and
their associated burst sizes – committed burst size (BC, or burst
rate) and peak burst size (BP), and the action to take for traffic
conforming to the maximum throughput, exceeding the maximum
throughput but within the peak information rate, or exceeding the
peak information rate. In addition to the actions defined by this
command to transmit, remark the DSCP service value, or drop a
packet, the switch will also mark the two color bits used to prioritize
service to packets of different colors.
The color modes include “Color-Blind” which assumes that the
packet stream is uncolored, and “Color-Aware” which assumes that
the incoming packets are pre-colored. The functional differences
between these modes is described at the beginning of this section
under “trTCM Police Meter.”
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Committed Information Rate (CIR) – Rate in kilobits per
second. (Range: 1-1000000 kbps or maximum port speed,
whichever is lower)
The rate cannot exceed the configured interface speed.
■
Peak Information Rate (PIR) – Rate in kilobits per second.
(Range: 1-1000000 kbps or maximum port speed, whichever is
lower)
The rate cannot exceed the configured interface speed.
■
Committed Burst Size (BC) – Burst in bytes.
(Range: 64-524288 bytes)
The burst size cannot exceed 16 Mbytes.
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