Table of Contents
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Chapter 10
| Quality of Service
Creating QoS Policies
Set IP DSCP – Configures the service provided to ingress traffic by setting
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an IP DSCP value for a matching packet (as specified in rule settings for a
class map). (Range: 0-63)
PHB – Per-hop behavior, or the priority used for this router hop.
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(Range: 0-7)
Drop Precedence – Drop precedence used in controlling traffic
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congestion. (Range: 0 - Green, 3 - Yellow, 1 - Red)
◆
Meter – Check this to define the maximum throughput, burst rate, and the
action that results from a policy violation.
◆
Meter Mode – Selects one of the following policing methods.
Flow (Police Flow) – Defines the committed information rate (CIR, or
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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: 0-1000000 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: 1-2147000 bytes at
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a granularity of 4k bytes)
Conform – Specifies that traffic conforming to the maximum rate (CIR)
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will be transmitted without any change to the DSCP service level.
Transmit – Transmits in-conformance traffic without any change to
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the DSCP service level.
Violate – Specifies whether the traffic that exceeds the maximum rate
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(CIR) will be dropped or the DSCP service level will be reduced.
Set IP DSCP – Decreases DSCP priority for out of conformance
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traffic. (Range: 0-63)
Drop – Drops out of conformance traffic.
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srTCM (Police Meter) – Defines the committed information rate (CIR, or
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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.
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