DHCP not working with 9120 AP connected to Native VLAN trunk port

[Ifarajimi]

I have a couple of C9120AXE Access points which are unable to get DHCP assigned IP addresses on trunk ports with native VLAn set to the AP Management subnet but when port is set to access port with same VLAN it gets an IP. Anyone able to explain what is happening. i have same setup with ubiquiti AP's and they have no problem getting an IP with same Cisco Switch configuration.

Additional information is that the switch is a C3850. I am beginning to suspect there are some compatibility issues between the C91xx APs and these switches to handle vlan tags. but unable to confirm just yet until i test with another switch.

See configuration below

interface GigabitEthernet2/0/5
description Test cisco AP
switchport trunk native vlan 254
switchport trunk allowed vlan 1,7,10,14,30,132,148
switchport mode trunk
spanning-tree portfast

ip dhcp pool VLAN254_AccessPointMgmt
network 10.254.46.0 255.255.255.0
default-router 10.254.46.1
dns-server 10.46.0.250 10.46.0.249
option 43 hex f108.0afe.5064.0afe.3864
lease infinite

[A Stevens · Accepted solution]

In this case, you also need to add the native VLAN in the allowed list and wait for the next DHCP cycle, or reboot the AP

[Ifarajimi]

Thank you that was the solution for some reason my mind was reading 254 also in the allowed list.