Specifications

Configuring Asynchronous Lines and Interfaces
How to Configure Asynchronous Interfaces and Lines
DC-26
Cisco IOS Dial Technologies Configuration Guide
Monitoring and Maintaining Asynchronous Rotary Line Queues
To display queued lines and to remove lines from the queue, use the following commands in EXEC mode
as needed:
Configuring Autoselect
Autoselect is used by the access server to sense the protocol being received on an incoming line and to
launch the appropriate protocol. Autoselect can be used for AppleTalk Remote Access (ARA), PPP, or
SLIP.
When using Autoselect, “login” authentication is bypassed, so if security is required, it must be
performed at the protocol level, that is, the AppleTalk Remote Access Protocol (ARAP) or PPP
authentication. SLIP does not offer protocol layer authentication.
To configure the Cisco IOS software to allow an ARA, PPP, or SLIP session to start automatically, use
the following command in line configuration mode:
The autoselect command enables the Cisco IOS software to start a process automatically when a start
character is received.
The autoselect command bypasses the login prompt and enables the specified session to begin
automatically. However, when the autoselect command is entered with the during login keyword, the
username or password prompt appears without the need to press the Return key; thus “login” users will
get a prompt right away without needing to press the Return key. While the username or password
prompt is displayed, you can choose either to answer these prompts or to send packets from an
autoselected protocol.
Normally a router avoids line and modem noise by clearing the initial data received within the first one
or two seconds. However, when the autoselect PPP feature is configured, the router flushes characters
initially received and then waits for more traffic. This flush causes timeout problems with applications
that send only one carriage return. To ensure that the input data sent by a modem or other asynchronous
device is not lost after line activation, enter the flush-at-activation line configuration command.
Note When the autoselect command is used, the activation character should be set to the default Return,
and exec-character-bits should be set to 7. If you change these defaults, the application cannot
recognize the activation request.
See the “High-Density Dial-In Solution Using Autoselect and EXEC Control Example” section for an
example that makes use of the autoselect feature.
Command Purpose
Router# show line async-queue rotary-group
Displays which lines are queued.
Router# clear line async-queue rotary-group
Clears all rotary queues or the specified rotary queue. If the
rotary-group argument is not specified, all rotary queues are
removed.
Command Purpose
Router(config-line)# autoselect {arap | ppp | slip |
during login}
Configures a line to automatically start an ARA, PPP, or
SLIP session.