It's best to power on the Meraki switches first. For Cisco switches, it's best to move the connections simultaneously. So, the best option is to run it during a maintenance window, disconnect the connections, access the switch via the CLI (console), change the portChannel configuration, and then move the connections to the Meraki switch. Run all the tests and then move to the new switch. There's no shortcut; just run one at a time and everything will be fine.
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