We are planning to upgrade our C9300 switch which are connected to the routers going to the internet. Current version is 16.6.4. We need to upgrade to 17.3.3. Since it has redundant etherchannel connections going to FW and Internet routers we expect failover. Is it possible to reload the switch one at a time so the other switch is UP and internet traffic will not be disrupted. Please see attached diagram for reference.
