Congratulations, not the way I would have done it but obviously it's working and you are happy and that is the main thing...
You said say it is mainly working , which tells me that the;
fiber ports are correctly connected between switches and working.
the default vlan is correctly connected i guess to allow you to manage all switches.
Personally I would have;
made sure each switch is at the current version of firmware,
left all switch ports in trunk mode and not altered any ports to general mode.
Trunk mode allows for one untagged vlan and many tagged vlans.
If you were in the VLAN>Interface setting page, tby clicking help, page specific help would pop up explaining the options..
If the Access Point (AP) is VLAN aware I would have tagged the switch port it is connected to for VLAN15 and left VLAN 1 there as a untagged port so you could manage the AP.
Used these wonderful switch Access-list functionality to restrict access so that wireless Guest could not access VLAN 1.
DHCP should be working on the default VLAN, but vlan 15 needs to be trunked to a vlan aware router that can provide DHCP services and NAT services for the wireless guests. Something as simple as a Cisco Small Business RV220W or even RV120W could act as a VLAN aware router , depending on the network size.
What follows is a link that may provide you with some extra hints and a recording i made to show how I set up LAG between two switches.
From reading the post it looks like you have two VLAN's.
Native ? VLAN 1 for your network
WIFIDMZ VLAN 15 for the WIFI network
If that is all of the VLAN's and the numbers are correct, I would setup all connecting ports as Trunk, with PVID as 1 untagged, and 15 as tagged.
Things that could cause issues is level 2 loops and spanning-tree. Make sure you set a switch to the root bridge. This can be done by setting one of the switches root priority from the default 32768 to 4096 or even 0. The value needs to be an increment of 4096.
If you are still not able to get this to work, I would recommend calling in and talking with a support engineer. We may need to look at the current configuration in order to find more information. the number to call in and create a case is 1-866-606-1866
I am not aware of any limit on how many vlans are allowed on a trunk you should be able to have all Vlans pass. Just add the vlan to the trunk as tagged on both sides. The most I have seen is 100 vlans, it was only a test environment but it was working.
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