LevelOne GTL-2691 User Manual

Page 296

HAPTER

| Quality of Service

Creating QoS Policies

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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 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 “srTCM 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.

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Committed Burst Size (BC) – Burst in bytes.

(Range: 64-524288 bytes)
The burst size cannot exceed 16 Mbytes.

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Exceeded Burst Size (BE) – Burst in excess of committed

burst size. (Range: 64-524288 bytes)

The burst size cannot exceed 16 Mbytes.

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Conform – Specifies whether that traffic conforming to the

maximum rate (CIR) will be transmitted without any change to

the DSCP service level, or if the DSCP service level will be

modified.

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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 maximum

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)