async [ dynamic address | dynamic routing | mode [dedicated | interactive]]
no async [ dynamic address | mode [dedicated | interactive]]
Specifies dynamic asynchronous addressing. In order to use dynamic addressing, the router must be in interactive mode, and the user will enter the address at the EXEC level. It is common to configure an asynchronous interface to have a default address and to allow dynamic addressing. With this configuration, the choice between the default address or a dynamic addressing is made by users when they enter the slip or ppp EXEC command. If the user enters an address, it is used, and if the user enters the default keyword, the default address is used.
Allow user to run dynamic routing protocols
Places a line into dedicated asynchronous mode using SLIP or PPP encapsulation. With dedicated asynchronous network mode, the interface will use either SLIP or PPP encapsulation, depending on which encapsulation method is configured for the interface. An EXEC prompt does not appear, and the router is not available for normal interactive use.
In interactive mode, the line can be used to make any type of connection, depending on the EXEC command entered by the user. For example, depending on its configuration, the line could be used for Telnet connections, or SLIP or PPP encapsulation.
The async interface configuration command is used to establish an asynchronous serial connection.
The following example sets the mode of the interface to dedicated:
Router(config-if)#async mode dedicated
The following example sets the mode of the interface to interactive:
Router(config-if)#async mode interactive
The following example sets the interface to dynamic address:
Router(config-if)#async dynamic address
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