Chapter 13: Quality of Service 247
Section 13-3
By default, no statistics are sent to the destination. Statistics can be sent to the
destination host (either IP address or hostname) using a specific UDP port or
through syslog (UDP port 514). If the syslog keyword is used, the syslog
facility-name can be given as kern, user, mail, daemon, auth, lpr, news, uucp,
cron, local0, local1, local2, local3, local4, local5, local6 (the default), or local7.
The syslog severity is one of emerg, alert, crit, err, warning, notice, info, or
debug (the default). See section “12-1: Logging” in Chapter 12, Switch
Management,” for more information about syslog.
b. (Optional) Set the data export interval:
(global) mls qos statistics-export interval interval
QoS statistics are sent to the destination every interval seconds (30 to 65,535
seconds; COS default 30 seconds, IOS default 300 seconds).
Tip Be careful when choosing an interval value. If the time is too long, the QoS statistics
counters could reach their maximum values and wrap back to 0. If the time chosen is too
short, the switch CPU load increases significantly. Begin with the default and make adjust-
ments, taking notice of the effects on both CPU and counters.
c. (Optional) Set the statistics delimiter:
(global) mls qos statistics-export delimiter character
QoS statistics can be separated by a specific character (default pipe or |) if desired.
2. Enable data gathering on the switch:
(global) mls qos statistics-export
By default, no QoS statistics are gathered or exported.
3. Gather QoS statistics from one or more sources.
a. (Optional) Select a switch port:
(interface) mls qos statistics-export
b. (Optional) Select an aggregate policer:
(global) mls qos statistics-export aggregate-policer policer-name
QoS statistics are gathered from the aggregate policer named policer-name (text
string). The policer must be configured as described in section “13-2: QoS
Configuration.”
c. (Optional) Select a QoS class map:
(global) mls qos statistics-export class-map classmap-name
You can gather statistics about a specific portion of a more complex QoS policy
if needed. Statistics are gathered from the QoS class map named classmap-name
(text string). The class map must be configured as described in section “13-2:
QoS Configuration.”
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