Brocade Communications Systems Brocate Ethernet Access Switch 6910 User Manual
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Brocade 6910 Ethernet Access Switch Configuration Guide
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Creating QoS Policies
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Set PHB – Configures the service provided to ingress traffic by setting the internal per-hop
behavior for a matching packet (as specified in rule settings for a class map). (Range: 0-7)
See
Table 163, "Default Mapping of DSCP Values to Internal PHB/Drop Values," on
).
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Set IP DSCP – Configures the service provided to ingress traffic by setting an IP DSCP
value for a matching packet (as specified in rule settings for a class map). (Range: 0-63)
•
Meter – Check this to define the maximum throughput, burst rate, and the action that results
from a policy violation.
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Meter Mode – Selects one of the following policing methods.
•
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.
•
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.
•
Conform – Specifies that traffic conforming to the maximum rate (CIR) 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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Violate – Specifies whether the traffic that exceeds the maximum rate (CIR) 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)
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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 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 “srTCM 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.