Adjusting the Interface Bandwidth
To adjust the interface bandwidth use the bandwidth kilobits interface configuration command. Use the no bandwidth command to restore the default value.
The example in Figure 1 adjusts the R1 Serial 0/0/1 interface bandwidth to 64 kb/s. A quick verification confirms that the interface bandwidth setting is now 64 kb/s.
The bandwidth must be adjusted at each end of the serial links, therefore:
- R2 requires its S0/0/1 interface to be adjusted to 1,024 kb/s.
- R3 requires its serial 0/0/0 to be adjusted to 64 kb/s and its serial 0/0/1 to be adjusted to 1,024 kb/s.
Use the Syntax Checker in Figure 2 to adjust the serial interface of R2 and R3.
Note: A common misconception for students who are new to networking and the Cisco IOS is to assume that the bandwidth command changes the physical bandwidth of the link. The command only modifies the bandwidth metric used by EIGRP and OSPF. The command does not modify the actual bandwidth on the link.