Stumbled upon a strange issue ...
Some of our clients are getting an IP in the management VLAN (VLAN10) of our AP's
We have about 185 AP121's (all untagged in VLAN10) and we're using 802.1x to assign different VLAN's to our users (depending on their group membership).
HOWEVER VLAN 10 is not assigned to any user(s) ...
We use static VLAN's.
An AP is connected to a switch (HP 1810) which has a port untagged in VLAN10, that same port is also tagged in alle VLAN's that are transmitted by the AP.
It's not configured as a trunk (however this option is possible on our HP switches, but we don't use it).
As Bob pointed out, the trunk terminology isn't used anymore on the more recent models of HP switches (1810, 2530).
You just tag, untag or exclude a VLAN on a certain port ...
Users do get an IP address, I checked the DHCP pool of that particular VLAN.
About 10-15 users (of about 200 in total) sometimes get an IP in that range.
you basically have 2 native vlans configured and so untagged traffic from one vlan hops over to another vlan.
*I would check the ap native vlan with your hp untagged vlan to see if they match.
I generally use a different mgmt vlans and native vlans