Where would you disable or enable Cisco Discovery Protocol?

Network Control Policy
This policy configures the network control settings for the Cisco UCS instance, including the following:

Whether the Cisco Discovery Protocol (CDP) is enabled or disabled

How the VIF behaves if no uplink port is available in end-host mode

Whether the server can use different MAC addresses when sending packets to the fabric interconnect

The network control policy also determines the action that Cisco UCS Manager takes on the remote Ethernet port or the vEthernet interface when the associated border port fails. By default, the Action on Uplink Fail property in the network control policy is configured with a value of link-down. This default behavior directs Cisco UCS Manager to bring the remote Ethernet or vEthernet port down if the border port fails.

http://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/sw/gui/config/guide/1-3-1/b_UCSM_GUI_Configuration_Guide_1_3_1/UCSM_GUI_Configuration_Guide_1_3_1_chapter19.html