Installation guide

Software Configuration 5-27

Additional Configuration Tasks

Router(config-if)# physical-layer async

Conﬁgure other asynchronous parameters according to your needs, for example:

Router(config-if)# async mode dedicated

Router(config-if)# async default routing

Step 4 To conﬁgure asynchronous line settings, use the line async command. A serial

port’s line number is related to its slot number and unit number in the following

way:

line-number = (16 x slot-number) + unit-number + 1

For example, serial port 1/2 corresponds to line number (16 x 1) + 2 + 1 = 19.

To set this port to a speed of 115200 bps, you would enter the following

commands:

Router(config-if)# line async 2

Router(config-if)# speed 115200

Note Future releases of Cisco IOS will support automatic line conﬁguration.

Existing asynchronous ports will be renumbered according to a different line

numbering convention.

To return an asynchronous port to synchronous operation, use the conﬁguration

mode physical-layer sync command.

Step 5 If you have completed the conﬁguration, press Ctrl-Z to exit conﬁguration

mode.

Step 6 Write the new conﬁguration to memory, as follows:

Router# copy running-config startup-config

The system displays a conﬁrmation message when the conﬁguration is saved.