I'm hoping for some help here, I'm trying to fire up a new Cisco 9800 WLC for first use, and for some reason I cant get the DHCP discovery from the client to be forwarded to and external DHCP Server. I enabled the DHCP Service from the CLI, also enabled "ip dhcp relay information trusted" on all the ports including the channel-port, but with no luck. when I enable wire shark on my client I see the requests going out for discovery, with no responses coming back. I am using vtp 3 setup so I can pull all the vlans down from the master switch, but unlike 5508 WLC there's no settings to point to a specific DHCP server there. Under Tags and Policies, I configured my policy in the advanced tab to require IPv4 DHCP and put a DHCP Server IP Address in it. I do have Central DHCP enabled on the general tab, but not quite sure what that setting is (on by default). I've toggled through various settings and not sure what to do next.
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read this document
the command ip dhcp server 126.96.36.199 is available in interface configuration mode
you can configure it in an interface assigned to a WLAN
and you can override it per WLAN assigned to an interface in wlan configuration mode
Do you have the dhcp relay on each vlan interface on the wireless controller? you need to have the SVI for each network you are using on your wireless, otherwise each vlan won't know to relay it. unfortunately you cant put a ip-helper address in the global config. if the vlan on your router is say 10.100.50.1 255.255.255.0 then just create the SVI to be 10.100.50.2 255.255.255.0. If you ever worked on the 5500 series controllers it had kind of the same concept. let me know