3650 Software Upgrade

[Stacia Taylor]

I am getting ready to upgrade my external switch stack and am being asked how long that this upgrade will take the network down. (It will be performed during a maintenance window.) I thought it took about 15-30 minutes but I am not sure of how long that the switch won't function during that time.

[luis_cordova · Accepted solution]

Hi @Stacia Taylor ,

Check this discussion:

https://community.cisco.com/t5/switching/3650-software-update-time/td-p/2971398

Regards

[Reza Sharifi]

Hi,

It depends, if you are upgrading from a very old version, I have seen the reboot time take up to about 20 minutes. If the switch is running a newer version, the reboot time can take up to 15 minutes.

HTH

[Stacia Taylor]

Thank you for your quick response! This has been very helpful!

[Leo Laohoo]

Depends what the current version is and what version intended to go to.
If the upgrade is going from one sub-version to another, like 3.6.1 to 3.6.9, then it will take about 4 minutes.
If the upgrade is going to go from one version to another, like 3.7.6 to 16.6.6, then it will take about 22 minutes because of a micro-code upgrade.

[Stacia Taylor]

That is good to know as I am moving from one version to another! Nice to have a reference for others that are just going from a sub-version to another.

[Joseph W. Doherty]

BTW, ideally it's nice to have console output during an upgrade.