Objective: Learn how the Cisco Discovery Protocol (CDP) functions and what is required for Cisco devices to be discovered.

　　Lab Equipment: Router 1 and Router 4 from the eRouters menu

　　Background Reading: Lab Primer Lesson 5: CDP

　　1. On Router 1, enter global configuration mode.

　　Router>enable

　　Router#conf t

　　Router(config)#

　　2. Change the host name to R1.

　　Router(config)#hostname R1

　　R1(config)#

　　3. Connect to Router 4, and change the host name to R4.

　　Router>enable

　　Router#conf t

　　Router(config)#hostname R4

　　R4(config)#

　　4. Return to R1, and enable the serial 0 interface. By default, all interfaces are shut down(disabled).

　　R1(config)#interface serial 0

　　R1(config-if)#no shutdown

　　5. Now, enable the serial 0 interface on R4.

　　R4(config)#interface serial 0