07-01-2022 03:39 PM - edited 07-01-2022 03:47 PM
I just started setting up some 3750X I received for an event. and after setting them up ive been just programming access points with just one. No real traffic going on just a 10G link to my core and adopting APs.. about 24 at a time. Ive noticed that the CPU has been at around 54 and 58%. Is that normal. ?
Switch Ports Model SW Version SW Image ------ ----- ----- ---------- ---------- * 1 54 WS-C3750X-48P 15.2(4)E8 C3750E-UNIVERSALK9-M Configuration register is 0xF
I did remove the http server and checked again
BigRedSw102(config)#do show proc cpu | e 0.0 CPU utilization for five seconds: 36%/0%; one minute: 39%; five minutes: 43% PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 4 487218 21036 23161 0.95% 2.37% 2.23% 0 Check heaps 87 446311 264642 1686 2.39% 2.13% 2.14% 0 RedEarth I2C dri 88 989100 170225 5810 4.63% 4.61% 4.61% 0 RedEarth Tx Mana 109 5039 1703 2958 0.15% 0.38% 0.74% 1 SSH Process 134 79018 21197 3727 0.79% 0.72% 0.62% 0 hpm counter proc 182 4337306 510139 8502 19.67% 19.97% 19.70% 0 Hulc LED Process 198 89731 4263 21048 0.47% 0.44% 0.42% 0 HQM Stack Proces 248 538380 203437 2646 1.75% 1.74% 2.39% 0 Spanning Tree
07-01-2022 11:11 PM
Hello,
in addition to the other posts, I think administratively shutting down (shut) all unused ports can help reducing CPU usage as well...
07-03-2022 07:13 AM
I wouldn't recommend just upgrading the .bin file. Get the .tar image and use the 'archive' commands to do the upgrade as this will clean the flash of old images and install the HTML files as well.
As everyone has said the switch is attempting to do a microcode upgrade/downgrade during the initial boot. This takes an AGE and it will reboot twice, and you don't want to interrupt it as you'll likely brick it and need to recover via the OoB Ethernet interface on the back.
archive download-sw /overwrite ftp://10.10.10.10/c3750e-universalk9-tar.152-4.E10.tar
Good luck.
07-04-2022 01:55 PM
These couple of DOCs will help to better understand the CPU outputs and usage on your C3750 Switch. If you follow both documents it will help you to determine if there is actually a problem on your CPU usage and to establish a baseline of CPU usage on your environment.
Troubleshooting High CPU Utilization (2016)
"Under normal operating conditions, on a non-stackable switch at a minimum, the CPU will have a certain baseline utilization. Depending on the model and the type being used this can range from 5 to 40% If the switch is stacked then, at a minimum, the CPU will operate normally a few percent higher. The number of members in the stack makes a difference on overall CPU utilization. In the stacked switch, the CPU utilization is measured on the master switch only. If the CPU is busy 5% of the time then the CPU is idle the other 95% of the time. The switch will never report CPU utilization at 0%. There are multiple background IOS processes running on timers that execute multiple times a second. This is why even in the simplest of deployments, the switch never reports 0% CPU utilization."
Catalyst 3750 Series Switches High CPU Utilization Troubleshooting (2009)
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