Cisco 3850 Upgrade IOS path from 03.02.03.SE to 03.06.03E.

[waqas ahmad]

We're facing high cpu utilization on switch for that, please recommend solution, if upgrade IOS then share the upgrade path from from 03.02.03.SE to 03.06.03E.

Please suggest stable version for cisco 3850, if anyone have experienced ?

Switch Ports Model SW Version SW Image Mode
------ ----- ----- ---------- ---------- ----
1 56 WS-C3850-48T 03.02.03.SE cat3k_caa-universalk9 INSTALL
2 56 WS-C3850-48T 03.02.03.SE cat3k_caa-universalk9 INSTALL

#show processes cpu sorted | ex 0.0
Core 0: CPU utilization for five seconds: 77%; one minute: 71%; five minutes: 69%
Core 1: CPU utilization for five seconds: 77%; one minute: 69%; five minutes: 69%
Core 2: CPU utilization for five seconds: 57%; one minute: 65%; five minutes: 67%
Core 3: CPU utilization for five seconds: 53%; one minute: 61%; five minutes: 62%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
5714 985059 97694899 424 45.29 44.84 44.97 1088 fed
9926 3902102 37182712 364 8.78 9.79 9.89 0 iosd
6242 701774 35671675 160 7.68 7.01 6.88 0 pdsd
5716 3042011 10743044 670 3.75 3.68 3.69 0 stack-mgr
5715 828147 27802208 15 0.18 0.12 0.12 0 platform_mgr
6256 1436408 66088266 1191 0.14 0.14 0.14 0 cpumemd

[Leo Laohoo]

Use the latest version of 3.6.X and upgrade using Install mode.

[malshara]

hello Waqas,

this is a well known issue due to  a software bug in fed process :CSCuz57493

and for that you need to upgrade for an ios image that has the fix which is  3.6.6 or later releases .

and for the upgrade procedure ,please find the below link for a detailed steps to upgrade the ios image:

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/16-6/release_notes/ol-16-6-3850.html

Regards