HI,
Platform Support
Wired guest access is supported on these platforms:
Cisco 4400 Wireless LAN Controller
Cisco Catalyst 6500 Series Wireless Services Module (WiSM)
Cisco Catalyst 3750G Integrated Wireless LAN Controller
It is not supported by 2106
But if you use ASA or Cisco router to firewall you able to add 'Auth Proxy' feature