LevelOne GTL-2881, User Manual

Page: 255 / 706

Chapter 10
| Quality of Service
Creating QoS Policies
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Committed Burst Size (BC) – Committed burst in bytes.
(Range: 64-16000000 at a granularity of 4k bytes)
The burst size cannot exceed 16 Mbytes.
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Excess Burst Size (BE) – Burst in excess of committed burst size.
(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 committed
information rate (CIR) and committed burst size (BC) will be transmitted
without any change to the DSCP service level.
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Transmit – Transmits in-conformance traffic without any change to
the DSCP service level.
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Exceed – Specifies whether traffic that exceeds the committed
information rate (CIR) but is within the excess burst size (BE) 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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Violate – Specifies whether the traffic that exceeds the excess burst
size (BE) 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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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
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 “trTCM Police Meter.”
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Committed Information Rate (CIR) – Committed 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.