|  | 4.3 | Router's Network Neighbors
| 4.3.5 | Lab: CDP Neighbors

| Lab Activity
| In this lab, you will use the
show cdp command. Cisco Discovery Protocol (CDP) discovers and shows information about directly connected Cisco devices (routers and switches). CDP is a Cisco proprietary protocol that runs at the data link layer (layer 2) of the OSI model. This allows devices that may be running different network layer 3 protocols such as IP or IPX to learn about each other. CDP begins automatically upon a device's system startup, however if you are using Cisco IOS Release 10.3 or newer version of IOS you must enable it on each of the device's interfaces by using the cdp enable command. Using the command show cdp interface you will gather information CDP uses for its advertisement and discovery frame transmission. Use show cdp neighbors and show cdp neighbors detail to display the CDP updates received on the local router.