Hello Cristiano,
You don't need to disconnect and connect again if you have Layer-3 Roaming enabled.
To configure Layer 3 Mobility, following requisites should be considered.
- SSID and security policies should be same across MAs.
- Client VLAN ID should be different for Layer 3 roaming.
- Either one or both of the bridge domain ID and client VLAN ID should be different for Layer 3 Roaming.
Please find the attached topology for better understanding.
Regards,
Moin Ilyas.