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Chapter 4
Introduction to the Cisco IOS
Router(config)#int s0
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
<300-4000000> Choose clockrate from list above
Router(config-if)#clock rate 64000
%Error: This command applies only to DCE interfaces
Router(config-if)#int s1
Router(config-if)#clock rate 64000
It doesn't hurt anything to try and put a clock rate on an interface. Notice
that the clock rate command is in bits per second.
The next command you need to get acquainted with is the bandwidth
command. Every Cisco router ships with a default serial link bandwidth of
T-1 (1.544Mbps). But this has nothing to do with how data is transferred
over a link. The bandwidth of a serial link is used by routing protocols such
as IGRP, EIGRP, and OSPF to calculate the best cost (path) to a remote
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