Router(config-if)#clock rate ? Speed (bits per second) 1200 2400 4800 9600 19200 38400 56000 64000 72000 125000 148000 250000 500000 800000 1000000 1300000 2000000 4000000 <300-8000000> Choose clockrate from list above
Router_A(config)#interface serial 0 Router_A(config-if)#ip address 192.168.1.1 255.255.255.0 Router_A(config-if)#clock rate 64000 Router_A(config-if)#no shutdown
Router_A(config)#interface serial 0 Router_A(config-if)#ip address 192.168.1.2 255.255.255.0 Router_A(config-if)#no shutdown
Router_A(config-if)#clock rate 64000
Router_A#ping 192.168.1.2