|  | 4.3 | Router's Network Neighbors
| 4.3.2 | Showing CDP neighbor entries
The primary use of CDP is to discover platforms and protocols on your neighboring devices. Use the show cdp neighbors command to display the CDP updates on the local router. The Figure displays an example of how CDP delivers its collection of information to a network administrator. Each router that is running CDP exchanges information regarding any protocol entries with its neighbors. The administrator can display the results of this CDP information exchange on a console that is connected to a router configured to run CDP on its interfaces. The network administrator uses a show command to display information about the networks directly connected to the router. CDP provides information about each CDP neighbor device. Values include the following: device identifiers -- e.g. the router's configured host name and domain name (if any) address list -- at least one address for SNMP, up to one address for each supported protocol port identifier -- e.g. Ethernet 0, Ethernet 1, and Serial 0 capabilities list -- e.g. if the device acts as a source route bridge as well as a router version -- information such as that provided by the local command show version platform -- the device's hardware platform, e.g. Cisco 7000 Notice that the lowest router in the figure is not directly connected to the administrator's console router. To obtain CDP information about this device, the administrator would need to Telnet to a router that is directly connected to this target.