Qos Statistics Data Export - Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual

Chapter 41 Configuring QoS
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Marking
When traffic is transmitted from the switch, QoS writes the ToS byte into IP traffic (Layer 3 switching
engine only) and the CoS value that was used for scheduling and congestion avoidance into ISL or
802.1Q traffic (for more information, see the
section on page

QoS Statistics Data Export

The QoS statistics data export feature generates per port and per aggregate policer utilization
information and forwards this information in UDP packets to traffic monitoring, planning, or accounting
applications. You can enable QoS statistics data export on a per port or on a per-aggregate policer basis.
The statistics data generated per port consists of counts of the input and output packets and bytes. The
aggregate policer statistics consists of counts of allowed packets and counts of packets exceeding the
policed rate.
The QoS statistics data collection occurs periodically at a fixed interval of 5 minutes, but the interval at
which the data is exported is configurable. QoS statistics collection is enabled by default, and the data
export feature is disabled by default for all ports and all aggregate policers configured on the
Catalyst 6000 family switch.
Per-port counter information and utilization statistics are not available for ATM ports.
Note
The QoS statistics data export feature is completely separate from TopN and NetFlow Data Export
Note
and does not interact with either of these features.
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Frames with CoS 6 or 7 go to the high-priority standard transmit queue (queue 3).
You can configure each standard transmit queue to use both a tail-drop and a
Note
WRED-drop threshold by mapping a CoS value to a queue or to a queue and a threshold.
The switch uses tail-drop thresholds for traffic carrying CoS values mapped only to a
queue. The switch uses WRED-drop thresholds for traffic carrying CoS values mapped
to a queue and a threshold.
Frames with CoS 5 go to the strict-priority transmit queue (queue 3), where the switch drops frames
only when the buffer is 100 percent full.
41-24).
"Final Layer 3 Switching Engine CoS and ToS Values"
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
Understanding How QoS Works
41-27