http://www.cisco.com/en/US/tech/tk962/technologies_tech_note09186a00801aa000.shtml
Router#show cdp neighbors
router#show cdp neighbors detail
eg Disable CDP on interface S1
Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#interface s1
Router(config-if)#no cdp enable
Router#show running-config int s1