C9500-48Y4C

[lachimi-sanyasi]

Hi Everyone,

Which IOS is the latest recommended for C9500-48Y4C stack switch? I want to upgrade it to the stable and latest one. Obiously I don't want to load with Bugs.

It is currently running in  17.09.04a

thank you

[Leo Laohoo]

Our fleet is currently on 17.12.4. 

17.12.5 is coming in the next 2 days.

[lachimi-sanyasi]

Do you think it is a good idea to go that extend? I am thinking of going up to 17.09.06a. Is it not good idea?

[Leo Laohoo]

We got off 17.9.X, in both wired and wireless, because we were seeing a lot of strange things.

1.  Make sure to constantly monitor (daily) the control-plane memory utilization: 

show platform resources

2.  If the memory utilization goes >55%, reboot. 

3.  Reboot the switches every 4 to 6 months.

[lachimi-sanyasi]

This is not windows to restart every few months. 

[liviu.gheorghe]

True, but it's still software and software will always have some kind of defects.

What @Leo Laohoo recommends comes from real life experience. It's always way better to reload the switch in a maintenance window than having it crash during a Monday morning.

The recommended software version for the C9500-48Y4C is either 17.12.4 or 17.9.6a.

HTH

[balaji.bandi]

This is not windows to restart every few months. 

which product we know in the world has no reboot required for maintenance? 

If the requirement is high availability, then you need to choose a Chassis with multiple support cards so you can perform maintenance.

If that doesn't meet the requirements, you can contact Cisco TAC to guide you better.