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
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.
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
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: