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Switch High CPU is above 90%

anil.gupta3
Level 1
Level 1

Hi Expert,

I am facing high CPU utilization with 3850 switch. CPU is hitting more than 90%. fed process is around 50% and pdsd process around 23%. Please help to resolve the issue.

below is version, cpu status and logs for analysis.

swicth3850#show ver

Switch Ports Model SW Version SW Image Mode
------ ----- ----- ---------- ---------- ----
1 56 WS-C3850-48T 03.02.03.SE cat3k_caa-universalk9 INSTALL

switch3850#sh processes cpu | exclude 0.00

Core 0: CPU utilization for five seconds: 90%; one minute: 92%; five minutes: 92%
Core 1: CPU utilization for five seconds: 94%; one minute: 73%; five minutes: 76%
Core 2: CPU utilization for five seconds: 16%; one minute: 47%; five minutes: 70%
Core 3: CPU utilization for five seconds: 97%; one minute: 89%; five minutes: 63%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
29 308880 227137409 0 0.05 0.01 0.03 0 sirq-timer/2
5644 1684929 394086379 887 49.7 50.1 50.1 1088 fed
5645 1435358 174735109 13 0.05 0.10 0.10 0 platform_mgr
5646 3109914 119925587 34 0.05 0.09 0.06 0 stack-mgr
6146 3521232 171189731 45 0.05 0.01 0.04 0 console_relay
6152 3916750 888191966 1211 22.8 22.8 22.9 0 pdsd
6159 3227748 167316157 96 0.05 0.01 0.03 0 mem_mgmt
6177 1782647 170530499 1194 0.14 0.15 0.14 0 cpumemd
9232 902482 397372568 25 0.05 0.10 0.10 0 wcm
9236 3298399 247840687 153 1.84 1.92 1.87 0 iosd
10189 176545 167385654 52 0.05 0.01 0.02 0 wnweb_paster.py

switch3850#show log

Oct 30 12:02:31.029 UTC: %IPC-5-WATERMARK: 3460 messages pending in xmt for the port Multicast Group(10900100.8F) from source seat 10900100,

Oct 30 12:03:06.489 UTC: %IPC-5-WATERMARK: 3460 messages pending in xmt for the port Multicast Group(10900100.8F) from source seat 10900100,

Oct 30 12:03:37.572 UTC: %IPC-5-WATERMARK: 3460 messages pending in xmt for the port Multicast Group(10900100.8F) from source seat 10900100,

2 Replies 2

Hello,

you could be hitting this bug:

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCux39490/?referring_site=bugquickviewredir

The workaround is to reload the switch.

If the bug is not applicable, you can do in-depth troubleshooting with these instructions:

http://www.cisco.com/c/en/us/support/docs/switches/catalyst-3850-series-switches/117594-technote-hicpu3850-00.html

pavankalal
Level 1
Level 1

how to resolved this ?

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