How to configure the Serial Interface of a Cisco router


We need to configure the Serial interface with a DCE cable plugged into it with clock rate command. There must be a clock rate set on every serial link between routers. It does not matter which router has the DCE cable plugged into it, or which interface the cable is plugged into.

The clock rate on the Serial interface where the DCE cable is plugged in to can be configured by "clock rate"ommand, as shown below.

HappyRouter(config)#int s0/0
HappyRouter(config-if)#ip address 192.168.10.17 255.255.255.0
HappyRouter(config-if)#clock rate 64000
HappyRouter(config-if)#no shutdown


The no shutdown Cisco IOS command  brings the router interface administratively up. We can use shutdown command to bring the router interface administratively up. 

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