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

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Chapter 32
Troubleshooting QoS
This chapter provides information for troubleshooting QoS.
QoS topics are discussed in the following sections:
■
Troubleshooting Memory and Processor Use for Egress Queue Rate Statistics
and Events on page 357
Troubleshooting Memory and Processor Use for Egress Queue Rate Statistics and
Events
Problem
The E Series Broadband Services Routers uses shared processing and memory when
it gathers egress queue rate statistics and events. If sufficient memory is not available,
the statistics gathering is temporarily disabled and the queues are considered to be
in
failover mode until memory becomes available.
The router displays a CLI message whenever queues are put into failover mode and
when they recover from failover mode.
NOTE: When an extremely large number of statistics is being gathered over a short
period of time, the router might release the processor to perform more important
tasks. This can result in longer rate periods than you have configured. For example,
if you configured 10,000 queues to gather statistics every second on a line module,
the router might actually lengthen the rate to 2 seconds or more.
Solution
To display the number of queues that are disabled because of no resources, issue
the
show egress-queue rates command.
Related Topics
■
Monitoring Forwarding and Drop Rates on the Egress Queue on page 333
■
show egress-queue rates
Troubleshooting Memory and Processor Use for Egress Queue Rate Statistics and Events
■ 357