Cisco Catalyst 9300 17.6.4 IOS 100% cpu util peak

[Helmar]

Hi everyone,

one our cisco switch C9300-48 Upgrade from 17.3.4 to 17.6.4 due to cpu high util bug, but after we upgrade to the latest we encountered an unknown 100% peak cpu utilization in the last 72hour graph. may I know if someone encountered the same issue and what can be the workaround on this.

Thank you!

[balaji.bandi]

Do you see any Logs :

also post below output :  (its worth to setup a EEM script to capture below output so you can get real time what is wrong)

show processes cpu sorted | ex 0.00
show proc cpu platform sorted location switch active R0

[Helmar]

Hi Balaji,

currently the switch are enrolled on our monitoring tool and the cpu reading are normal, there are no 100% util peak in the history. below are the logs of cpu sorted and platform.

CPU utilization for five seconds: 1%/0%; one minute: 1%; five minutes: 1%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
163 397718 197406 2014 0.07% 0.07% 0.07% 0 IOMD IPC process
74 181356 3262589 55 0.07% 0.03% 0.02% 0 Net Background
139 220761 34919641 6 0.07% 0.04% 0.02% 0 L2 LISP Punt Pro

[balaji.bandi]

Looks like initially took some time to stable the network, some time CPU also go high due to STP and MAC address storms, how big the network and what part of the switch is the network also counts here.

observe and post your outcome, if this is stable may be I call it one-time spikes.

[MHM Cisco World]

this high CPU in this periodic interval meaning that there is some protocol run in this interval and make CPU high utilize 
can I see 
CPU sort

I need to see if BGP is in top five of high CPU process 

[Helmar]

Hi MHM,

there are no bgp routing protocol on the switch and its connected to core directly via etherchannel. please see below the result of cpu sort.

[MHM Cisco World]

CSCvd45710 : Bug Search Tool (cisco.com)