Thanks for your support, Parnassus, as always! You have saved me in the past many other times the day with your precious advice to other users!!!
I will use a test switch trunk-connected with the main one (the trunk port is setted with the VLAN 1 untagged and all the others tagged).I thought to configure this switch in this way: port 1 for emergency connection, port 2 for trunk connection to the other switch (vlan1 untagged, 20 and 100 tagged); from 3 to 24 vlan20 tagged and 100 untagged.I intend to connect the 8 Giga-ports of the UDM-Pro from port 3 to 10, set into UDM-PRO the ports in "all mode" (I think it's the ubiquiti-equivalent of the trunking in the Aruba-land) and assign the vlan100 to the wi-fi network from the dedicated menu within the controller configuration (on the sandbox config this set-up worked fine).The dhcp is managed by the OPNSense firewall, and therefore, of course, I have already disabled this option from the udm-pro.I will connect the access points on the remaining ports. This is just a test as I obviously do not intend to attach them all on the same switch (for completeness of information there are 44 cisco repeater located on various locations and various switches). Theoretically, disconnecting the 2 Cisco controllers and connecting the UDM-PRO in this way, it should work. By setting the other switches with the same criterion (for each port where an access point is connected, VLAN20 tagged and 100 untagged), the UDM-PRO should see all the access points scattered around the network... It must be said that the current Cisco configuration provides 8 LACP trunks on two separate switches (connected to the main switch of the star center), I do not know if the non-possibility of reconfiguring this scenario could give stability problems...but perhaps logically splitting the traffic on 8 trunk ports there should be no problems.
Ultimately, to prevent the UDM-PRO from complaining about the absence of internet, I directly configured a WAN access to the WAN-ETH port (it is a multi-wan connectivity with an ip address pool).
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