Change channel group mode without down time.

Hi All,
I'm trying to find a way to change the channel group mode on our access switch from mode on to mode active.
The port on access switch and core switch are configured like this : channel group X mode on
The goal is to change this config to channel group X mode active with no down time of the switch.
Please let me know if you have any ideas to do that.
Fabien.

I don't think its possible to change a Channel Group Mode without downtime.
Changing from On to Active will cause the port to start sending LACP messages in order to form an LACP Port-Channel.
As you are taking a link down, I suspect spanning-tree will also try and reconverge.
The downtime should be fairly minimal though, do you have a maintenance window?

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