Chapter 10
| Quality of Service
Creating QoS Policies
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◆ Meter Mode – Selects one of the following policing methods.
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Flow (Police Flow) – Defines the committed information rate (CIR, or
maximum throughput), committed burst size (BC, or burst rate), and the
action to take for conforming and non-conforming traffic. Policing is based
on a token bucket, where bucket depth (that is, the maximum burst before
the bucket overflows) is specified by the “burst” field, and the average rate
tokens are removed from the bucket is by specified by the “rate” option.
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Committed Information Rate (CIR) – Rate in kilobits per second.
(Range: 0-10000000 kbps at a granularity of 64 kbps or maximum port
speed, whichever is lower)
The rate cannot exceed the configured interface speed.
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Committed Burst Size (BC) – Burst in bytes. (Range: 64-16000000 at a
granularity of 4k bytes)
The burst size cannot exceed 16 Mbytes.
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Conform – Specifies that traffic conforming to the maximum rate (CIR)
will be transmitted without any change to the DSCP service level.
■
Transmit – Transmits in-conformance traffic without any change to
the DSCP service level.
■
Violate – Specifies whether the traffic that exceeds the maximum rate
(CIR) will be dropped or the DSCP service level will be reduced.
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Set IP DSCP – Decreases DSCP priority for out of conformance
traffic. (Range: 0-63)
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Drop – Drops out of conformance traffic.
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srTCM (Police Meter) – Defines the committed information rate (CIR, or
maximum throughput), committed burst size (BC, or burst rate) and excess
burst size (BE), and the action to take for traffic conforming to the
maximum throughput, exceeding the maximum throughput but within the
excess burst size, or exceeding the excess burst size. 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
set the drop precedence of a packet.
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 “srTCM Police Meter.”
■
Committed Information Rate (CIR) – Rate in kilobits per second.
(Range: 0-10000000 kbps at a granularity of 64 kbps or maximum port
speed, whichever is lower)
The rate cannot exceed the configured interface speed.
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