Switching

I noticed a switch in the Mist dashboard that indicated the CPU was well up in CPU utilization. Indocator was red. SO I checked the CPU with the show chassis routing-engine command and got this report:

show chassis routing-engine 
Routing Engine status:
  Slot 0:
    Current state                  Master
    Temperature                 37 degrees C / 98 degrees F
    CPU temperature             37 degrees C / 98 degrees F
    DRAM                      1943 MB (2048 MB installed)
    Memory utilization          22 percent
    5 sec CPU utilization:
      User                      35 percent
      Background                 0 percent
      Kernel                    23 percent
      Interrupt                  3 percent
      Idle                      40 percent
    Model                          RE-EX2300-48MP
    Serial ID                      BUILTIN
    Start time                     2025-04-22 18:20:35 PDT
    Uptime                         1 day, 19 hours, 21 minutes, 2 seconds
    Last reboot reason             Router rebooted after a normal shutdown.
    Load averages:                 1 minute   5 minute  15 minute
                                       1.78       2.20       2.35

When I look at another switch that is fairly busy with live ports, I only see 2 percent Kernal percent and 97 percent idle.  What should I look at to determine what is using so much CPU time? 

Start by identifying which process:  

To show software processes:Make sure you are in operational mode.Enter the 'show system processes extensive' command.This command shows the CPU utilization on the device and lists the processes in order of CPU utilization.

https://www.juniper.net/documentation/us/en/software/junos/cli/topics/topic-map/junos-operational-mode-commands-monitoring.html#d140e23

Regards,

I noticed a switch in the Mist dashboard that indicated the CPU was well up in CPU utilization. Indocator was red. SO I checked the CPU with the show chassis routing-engine command and got this report:

show chassis routing-engine 
Routing Engine status:
  Slot 0:
    Current state                  Master
    Temperature                 37 degrees C / 98 degrees F
    CPU temperature             37 degrees C / 98 degrees F
    DRAM                      1943 MB (2048 MB installed)
    Memory utilization          22 percent
    5 sec CPU utilization:
      User                      35 percent
      Background                 0 percent
      Kernel                    23 percent
      Interrupt                  3 percent
      Idle                      40 percent
    Model                          RE-EX2300-48MP
    Serial ID                      BUILTIN
    Start time                     2025-04-22 18:20:35 PDT
    Uptime                         1 day, 19 hours, 21 minutes, 2 seconds
    Last reboot reason             Router rebooted after a normal shutdown.
    Load averages:                 1 minute   5 minute  15 minute
                                       1.78       2.20       2.35

When I look at another switch that is fairly busy with live ports, I only see 2 percent Kernal percent and 97 percent idle.  What should I look at to determine what is using so much CPU time? 

I noticed a switch in the Mist dashboard that indicated the CPU was well up in CPU utilization. Indocator was red. SO I checked the CPU with the show chassis routing-engine command and got this report:

show chassis routing-engine 
Routing Engine status:
  Slot 0:
    Current state                  Master
    Temperature                 37 degrees C / 98 degrees F
    CPU temperature             37 degrees C / 98 degrees F
    DRAM                      1943 MB (2048 MB installed)
    Memory utilization          22 percent
    5 sec CPU utilization:
      User                      35 percent
      Background                 0 percent
      Kernel                    23 percent
      Interrupt                  3 percent
      Idle                      40 percent
    Model                          RE-EX2300-48MP
    Serial ID                      BUILTIN
    Start time                     2025-04-22 18:20:35 PDT
    Uptime                         1 day, 19 hours, 21 minutes, 2 seconds
    Last reboot reason             Router rebooted after a normal shutdown.
    Load averages:                 1 minute   5 minute  15 minute
                                       1.78       2.20       2.35

When I look at another switch that is fairly busy with live ports, I only see 2 percent Kernal percent and 97 percent idle.  What should I look at to determine what is using so much CPU time? 

------------------------------
JOHN WILLIAMSON
------------------------------

This kb for evaluation of potential EX switch causes for high CPU and filters to block the traffic causing the increases.

https://supportportal.juniper.net/s/article/EX-Troubleshooting-and-resolving-high-CPU-utilization-on-EX4300?language=en_US

I noticed a switch in the Mist dashboard that indicated the CPU was well up in CPU utilization. Indocator was red. SO I checked the CPU with the show chassis routing-engine command and got this report:

show chassis routing-engine 
Routing Engine status:
  Slot 0:
    Current state                  Master
    Temperature                 37 degrees C / 98 degrees F
    CPU temperature             37 degrees C / 98 degrees F
    DRAM                      1943 MB (2048 MB installed)
    Memory utilization          22 percent
    5 sec CPU utilization:
      User                      35 percent
      Background                 0 percent
      Kernel                    23 percent
      Interrupt                  3 percent
      Idle                      40 percent
    Model                          RE-EX2300-48MP
    Serial ID                      BUILTIN
    Start time                     2025-04-22 18:20:35 PDT
    Uptime                         1 day, 19 hours, 21 minutes, 2 seconds
    Last reboot reason             Router rebooted after a normal shutdown.
    Load averages:                 1 minute   5 minute  15 minute
                                       1.78       2.20       2.35

When I look at another switch that is fairly busy with live ports, I only see 2 percent Kernal percent and 97 percent idle.  What should I look at to determine what is using so much CPU time? 

I am seeing this same thing, but when I click on the link I get "You do not have the required access privileges to view the selected content." Is there a way to get to this content so I can continue to diagnose my switches?

This kb for evaluation of potential EX switch causes for high CPU and filters to block the traffic causing the increases.

https://supportportal.juniper.net/s/article/EX-Troubleshooting-and-resolving-high-CPU-utilization-on-EX4300?language=en_US

I noticed a switch in the Mist dashboard that indicated the CPU was well up in CPU utilization. Indocator was red. SO I checked the CPU with the show chassis routing-engine command and got this report:

show chassis routing-engine 
Routing Engine status:
  Slot 0:
    Current state                  Master
    Temperature                 37 degrees C / 98 degrees F
    CPU temperature             37 degrees C / 98 degrees F
    DRAM                      1943 MB (2048 MB installed)
    Memory utilization          22 percent
    5 sec CPU utilization:
      User                      35 percent
      Background                 0 percent
      Kernel                    23 percent
      Interrupt                  3 percent
      Idle                      40 percent
    Model                          RE-EX2300-48MP
    Serial ID                      BUILTIN
    Start time                     2025-04-22 18:20:35 PDT
    Uptime                         1 day, 19 hours, 21 minutes, 2 seconds
    Last reboot reason             Router rebooted after a normal shutdown.
    Load averages:                 1 minute   5 minute  15 minute
                                       1.78       2.20       2.35

When I look at another switch that is fairly busy with live ports, I only see 2 percent Kernal percent and 97 percent idle.  What should I look at to determine what is using so much CPU time?