Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010, Configuration Manual

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Chapter 5
Gathering Statistics for Rates and Events
in the Queue
This chapter provides information for configuring statistics profiles on the E Series
router.
QoS topics are discussed in the following sections:
■
QoS Statistics Overview on page 37
■
Configuring Statistic Profiles for QoS on page 39
■
Configuring Rate Statistics on page 39
■
Configuring Event Statistics on page 40
■
Clearing QoS Statistics on the Egress Queue on page 41
■
Clearing QoS Statistics on the Fabric Queue on page 42
■
Monitoring QoS Statistics for Rates and Events on page 42
QoS Statistics Overview
Statistics profiles enable you to gather statistics for the rate at which packets are
forwarded out of a queue and for the rate at which committed, conformed, or
exceeded packets are dropped. Statistics profiles also enable you to use events to
monitor the rate statistics. You can then use
show commands to view the results of
the statistics gathering.
You can create up to 250 statistics profiles on the E Series Broadband Services Routers.
The profiles are referenced by a queue rule within a QoS profile.
Statistics cannot be collected on failover queues.
When you create a statistics profile, you specify the time period over which statistics
are gathered. To gather event statistics, you configure the thresholds for triggering
rate-event reporting.
■
Rate period—Time period, in seconds, over which statistics are gathered. For
example, a 30-second rate period results in rate statistics being gathered over
30-second time segments.
■
Forwarding rate threshold—Threshold for forwarding rate events. A
forwarding-rate event is counted whenever the forwarding rate exceeds the
specified threshold.
QoS Statistics Overview
■ 37