Brocade Communications Systems Brocate Ethernet Access Switch 6910 - Manual (Page 859)

Brocade 6910 Ethernet Access Switch Configuration Guide 809
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Creating QoS Policies
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• Committed Burst Size (BC) – Burst in bytes. (Range: 0-16000000 at a granularity of
4k bytes)
The burst size cannot exceed 16 Mbytes.
• Exceeded Burst Size (BE) – Burst in excess of committed burst size.
(Range: 0-16000000 at a granularity of 4k bytes)
The burst size cannot exceed 16 Mbytes.
• 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.
• 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.
• 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 for Random Early Detection.
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.”
• Committed Information Rate (CIR) – Rate in kilobits per second. (Range: 0-1000000
kbps at a granularity of 64 kbps or maximum port speed, whichever is lower)
The rate cannot exceed the configured interface speed.
• Committed Burst Size (BC) – Burst in bytes. (Range: 0-16000000 at a granularity of
4k bytes)
The burst size cannot exceed 16 Mbytes.
• Peak Information Rate (PIR) – Rate in kilobits per second. (Range: 0-1000000 kbps at
a granularity of 64 kbps or maximum port speed, whichever is lower)
The rate cannot exceed the configured interface speed.