CPU Utilization and interface Summary

[muraripadhan]

Dears

Q-  want to know how i will check my switch CUP Utilizatioin and how i will know my switch cpu is fine or not?

Q- How to calculate CPU Utilization? and what bit rate is best?

Q-  how to know how much bits transfer in my interface one by one ?

Q- How to know my switch health is good or not?

I am using Layer 3 Switch

I want to know the command for Cisco 3000 and 4000 series switch.

I want to check everything in my switch how i will do that and what are the commands.

[Julio E. Moisa]

Hi

The command to verify the CPU is: 

show process cpu history (it will display a graphic so you will be able to analize by second, minute or hour)

show process cpu sorted (it will show you the % used by the processes in real time)

Now to see the bit transfer on your interface you can use show interface <interface> 

About the health it depends how the switch is configured and for what it was destined, for example a switch for servers or a switch for routing could generate more traffic than a switch for end users. Also a STP problem can generate high CPU utilization. 

Usually a switch for end users could use 10-20% of CPU resources. You could take as reference 50-60 as warning, 60+ it could indicate a problem.

Hope it is useful

:-)

[muraripadhan]

Please Sir,

Tell me how to read 

show process cpu history (it will display a graphic so you will be able to analize by second, minute or hour)

I tried this command got graph but i can not understand.......please explain me sir

[Julio E. Moisa]

Hi my friend, sure

You will see 3 graphics, 

- the last 1 minute
- the last 1 hours
- the last 72 hours

First graphic is useful to know the current behavior, for example on this picture you will see some spikes to 40% and then it goes to 10% or less, basically there was some process who increased the CPU to 40, the first spike has a duration of 10 second.

0__ 5__ 1__1__2 __2__3__3__4__4....  (for the first graphic the interval highlighted in blue represent the duration, at the 1st graphic each interval is 5 seconds, in the 2nd graphic represent  5 minutes, in the 3rd graphic is represented with 5 hours. 

Other example:

The graphic will be moving from left to right side.