Support Support Downloads Knowledge Base Case Manager My Juniper Community

Knowledge Base

Search our Knowledge Base sites to find answers to your questions.

Ask All Knowledge Base Sites All Knowledge Base Sites JunosE Defect (KA)Knowledge BaseSecurity AdvisoriesTechnical BulletinsTechnotes Sign in to display secure content and recently viewed articles

[EX] High CPU utilization when running "request support information" command

0

0

Article ID: KB29345 KB Last Updated: 04 Mar 2017Version: 3.0
Summary:

This article provides information on how to run the request support information command without causing high CPU utilization.

The request support information command executes various commands from the CLI (command line interface) and the VTY (virtual teletype CLI).

For more information on the request support information command, consult this document:

request support information

Symptoms:

The CPU becomes busy after the request support information | no more command is executed via SSH or Telnet.

As a result, control packets can be dropped, impacting traffic.

If you have a large routing table or configuration, the possibility of encountering this issue can increase.

Cause:

In the example below, the output of the run show chassis routing-engine command reveals that available CPU usage was 64% before the command was executed, but was reduced to 0% after the command was executed.

CPU Utilization BEFORE executing run support information command

root@EX4200# run show chassis routing-engine
Routing Engine status:
  Slot 2:
    Current state                  Master
    Temperature                 40 degrees C / 104 degrees F
    CPU temperature             40 degrees C / 104 degrees F
    DRAM                      1024
    Memory utilization          61 percent
    CPU utilization:
      User                      19 percent
      Background                 0 percent
      Kernel                    16 percent
      Interrupt                  0 percent
     Idle                  64 percent
Model EX4200-48PX,48 POE+ Serial ID FP0211447333 Start time 2014-07-03 09:15:12 JST Uptime 14 days, 3 hours, 11 minutes, 2 seconds Last reboot reason Router rebooted after a normal shutdown. Load averages: 1 minute 5 minute 15 minute 0.88 2.74 2.39

CPU Utilization AFTER executing run support information command

root@EX4200# run show chassis routing-engine
Routing Engine status:
  Slot 2:
    Current state                  Master
    Temperature                 37 degrees C / 98 degrees F
    CPU temperature             37 degrees C / 98 degrees F
    DRAM                      1024
    Memory utilization          62 percent
    CPU utilization:
      User                      68 percent
      Background                 0 percent
      Kernel                    32 percent
      Interrupt                  1 percent
     Idle                   0 percent     
    Model                          EX4200-48PX,48 POE+
    Serial ID                      FP0211447333
    Start time                     2014-07-03 09:15:12 JST
    Uptime                         14 days, 3 hours, 15 minutes, 54 seconds
    Last reboot reason             Router rebooted after a normal shutdown.
    Load averages:                 1 minute   5 minute  15 minute
                                       4.63       3.84       2.38
Solution:

We recommend that you DO NOT EXECUTE the request support information command with the no-more option on a terminal window, especially when connecting to the EX via SSH or Telnet.

Instead, execute the request support information command with the save option and save the output to the /var/log/ directory, as in the following example:

root@EX4200> request support information | save /var/log/RSI-hostname_YYYY-MM-DD.txt

For more information on the pipe ( | ) option with the save command, consult this document:

Comment on this article > Affected Products Browse the Knowledge Base for more articles related to these product categories. Select a category to begin.

Getting Up and Running with Junos

Getting Up and Running with Junos Security Alerts and Vulnerabilities Product Alerts and Software Release Notices Problem Report (PR) Search Tool EOL Notices and Bulletins JTAC User Guide Customer Care User Guide Pathfinder SRX High Availability Configurator SRX VPN Configurator Training Courses and Videos End User Licence Agreement Global Search