What is function of DHCP Over there in WLC

[eigrpy]

Hi Anyone can explain the DHCP override  in the below picture. Thank you

[balaji.bandi · Accepted solution]

Step 1	Disable the WLAN by entering this command: config wlan disable wlan-id
Step 2	Specify the interface for which you configured a primary DHCP server to be used with this WLAN by entering this command: config wlan interface wlan-id interface_name
Step 3	If you want to define a DHCP server on the WLAN that will override the DHCP server address on the interface assigned to the WLAN, enter this command: config wlan dhcp_server wlan-id dhcp_server_ip_address [ required] The required is an optional argument. Using this argument forces DHCP address assignment to be applied to the WLAN. Note  The preferred method for configuring DHCP is to use the primary DHCP address assigned to a particular interface instead of the DHCP server override. If you enable the override, you can use the show wlan command to verify that the DHCP server has been assigned to the WLAN. Note  If a WLAN has the DHCP server override option enabled and the controller has DHCP proxy enabled, any interface mapped to the WLAN must have a DHCP server IP address or the WLAN must be configured with a DHCP server IP address. Note  PMIPv6 supports only DHCP based clients and Static IP address is not supported.
Step 4	Reenable the WLAN by entering this command: config wlan enable wlan-id

[MHM Cisco World · Accepted solution]

why DHCP Override?
there is DHCP proxy for WLAN.
the DHCP request will proxy to Server that is config under the Management Interface "DHCP information"
BUT sometime we want to forward DHCP request to other Server other than the Server list under Management Interface so we do than under WLAN advance DHCP override.

[Scott Fella · Accepted solution]

For AireOS, the configuration guides have good explanations of majority of the features.  Also on AireOS, there is the help link located on the main menu between the 'commands' and 'feedback'.  That is a quick and easy way of what a feature is, but the configuration guide would go into more details.

Cisco Wireless Controller Configuration Guide, Release 8.5 - DHCP [Cisco Wireless LAN Controller Software] - Cisco