Our video tutorial missed to clarify few information, so we explained here
- 10.150.102.1 and 10.150.180.1 are IPs of SVI configured on the switches.
- 10.150.200.253 is an interface on Cisco ASA firewall, being Guest WLAN, we have not configured SVI on the switch and let ASA handle DHCP Server and lease IPs.
- You should necessarily have DHCP server running in VLAN 102 otherwise you cannot make your APs work. You need it till you complete your initial configuration.
interface vlan 102 description DEVICE-MANAGEMENT ip address 10.150.102.1 ip helper-address 10.150.102.10 interface vlan 180 description CLIENTS ip address 172.20.180.1 ip helper-address 10.150.102.10 interface vlan 200 description GUESTS ip helper-address 10.150.200.253 interface GigabitEthernet 1/0/10 switchport trunk native vlan 102 switchport trunk allowed vlan 102,180,200 switchport mode trunk interface GigabitEthernet 2/0/10 switchport trunk native vlan 102 switchport trunk allowed vlan 102,180,200 switchport mode trunk