CISCO 3850 high CPU usage and How to find if there is a bug in an IOS using CISCO website

[aprasad11]

Hi All,

I have 2x3850 Stack switches and "FED" is taking up all CPU resource. Requesting if someone can help me find how can i find if this is a software bug and where in CISCO website can i confirm this. Below is CPU usage and version IOS i am using.

5667 1361040 119244210 11 0.00 0.00 0.00 1088 slproc
5709 3170492 358355898 644 69.8 71.8 71.9 1088 fed

999999999999999999999999999999999999999999999999999999999999
888888888666666666666666666667777766666777776666666666777776
100 ************************************************************
90 ************************************************************
80 ************************************************************
70 ************************************************************
60 ************************************************************
50 ************************************************************
40 ************************************************************
30 ************************************************************
20 ************************************************************
10 ************************************************************
0....5....1....1....2....2....3....3....4....4....5....5....
0 5 0 5 0 5 0 5 0 5
CPU% per second (last 60 seconds)

1 1
999999999999909999999999999999999999999990999999999999999999
897989797999807989797889998979998988897980888979898889898788
100 ############################################################
90 ############################################################
80 ############################################################
70 ############################################################
60 ############################################################
50 ############################################################
40 ############################################################
30 ############################################################
20 ############################################################
10 ############################################################
0....5....1....1....2....2....3....3....4....4....5....5....
0 5 0 5 0 5 0 5 0 5
CPU% per minute (last 60 minutes)
* = maximum CPU% # = average CPU%

Switch Ports Model SW Version SW Image Mode
------ ----- ----- ---------- ---------- ----
* 1 56 WS-C3850-48T 03.06.05E cat3k_caa-universalk9 INSTALL
2 56 WS-C3850-48T 03.06.05E cat3k_caa-universalk9 INSTALL

[Leo Laohoo · Accepted solution]

Please take the time to read the following: 

• FN - 64191 - Catalyst 3850/3650 Switches That Run Cisco IOS XE Releases 3.6.5E/3.7.4E or Earlier Might Exhibit High CPU Usage
• FN - 70110 - Memory Leak Issue on C3850/C3650 Switches That Run Polaris Software Version 16.3.3 or Earlier

[aprasad11]

Thanks i will upgrade the IOS in tw days

[aprasad11]

upgrade to IOS Version 16.9.5 has resolved issue

[Reza Sharifi · Accepted solution]

Hi,

There seem to be a bug associated with a different version that maybe also effecting the version you are running. Here is the link.

You may want to open a ticket with Cisco on this as they will probably recommend an upgrade to a version that has the fix.

This link also shows the versions that have the fix.

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCux39490/?rfs=iqvred

HTh

[aprasad11]

Thanks i will upgrade the IOS

[aprasad11]

upgrade to IOS Version 16.9.5 has resolved issue