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  • Hirofumi Takahashi thinks this is interesting:

Bandwidth is expressed in units of kilobits per second. It is a static number used for metric calculation only and does not necessarily reflect the actual bandwidth of the link—that is, bandwidth is not measured dynamically. For example, the default bandwidth of a serial interface is 1544, whether the interface is attached to a T1 or a 56K line. This bandwidth number may be changed from the default with the bandwidth command.


Cover of Routing TCP/IP, Volume 1, 2/e


Meaning of Bandwidth under Interface