Switch stack processing

[Mike Buyarski]

When you have a stack of switches in this case layer 3 switches which one in the stack will do all the processing. I assume it would be the active (primary) one and not any real processing on the other switches in the stack?

for instance we see the active switch CPU getting hit hard while the other switch in the stack we do not see the cpu used much at all.

[balaji.bandi]

General Design in Stack, Master switch which does all the control plane traffic as well as Data, rest of the participants only do the Data plane - depends on how you configure the stack and provision them.

check what is the hitting process.

show process cpu command help you.  post some output to have look.

[Mike Buyarski]

i have the "sh proc cpu" attached. first thing it does not seem to spread the usage between the cores very well.

switch IOS XE version: 03.03.01SE

switch model: WS-C3650-24PD

we were thinking this might be the reason we are getting some random lag here and there.

the one change that should be happening tomorrow (10/3) is we are updating the software version to 16.3.6.

[balaji.bandi]

can you post only below output to read correctly.

show proc cpu  | ex 0.0

show proc cpu detailed fed | ex 0.0

show proc cpu detailed psds | ex 0.00

[Mike Buyarski]

had to make a few adjustments to the commands but its attached

[balaji.bandi · Accepted solution]

Looks like similar issue hit with below bug, but for your version not found same issue.

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

hopefully your planned upgrade should fix the issue.

[Mike Buyarski]

the update did correct the issue. the cpu usage did drop down to a much lower level.