Specifications

Configuring Asynchronous Lines and Interfaces
How to Configure Other Asynchronous Line and Interface Features
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Cisco IOS Dial Technologies Configuration Guide
To control the EXEC process, use the following commands in line configuration mode:
See the “High-Density Dial-In Solution Using Autoselect and EXEC Control Example” section for an
example of configuring control over the EXEC process.
Enabling Routing on Asynchronous Interfaces
To route IP packets on an asynchronous interface, use one of the following commands in interface
configuration mode:
The async dynamic routing command routes IP packets on an asynchronous interface, which permits
you to enable the Interior Gateway Routing Protocol (IGRP), Routing Information Protocol (RIP), and
Open Shortest Path First (OSPF) routing protocols for use when the user makes a connection using the
ppp or slip EXEC commands. The user must, however, specify the /routing keyword at the SLIP or PPP
command line.
For asynchronous interfaces in interactive mode, the async default routing command causes the ppp
and slip EXEC commands to be interpreted as though the /route switch had been included in the
command. For asynchronous interfaces in dedicated mode, the async dynamic routing command
enables routing protocols to be used on the line. Without the async default routing command, there is
no way to enable the use of routing protocols automatically on a dedicated asynchronous interface.
See the following sections for examples of enabling routing on asynchronous interfaces:
• Asynchronous Interface As the Only Network Interface Example
• IGRP Configuration Example
Configuring Dedicated or Interactive PPP and SLIP Sessions
You can configure one or more asynchronous interfaces on your access server (and one on a router) to
be in dedicated network interface mode. In dedicated mode, an interface is automatically configured for
SLIP or PPP connections. There is no user prompt or EXEC level, and no end-user commands are
required to initiate remote-node connections. If you want a line to be used only for SLIP or PPP
connections, configure the line for dedicated mode.
Command Purpose
Step 1
Router(config-line)# exec
Turns on EXEC processes.
Step 2
Router(config-line)# exec-timeout minutes [ seconds ]
Sets the idle terminal timeout interval.
Command Purpose
Router(config-if)# async dynamic routing
Configures an asynchronous interface for dynamic
routing. Use this command to manually bring up
PPP from an EXEC session.
Router(config-if)# async default routing
Automatically configures an asynchronous
interface for routing. Use this command to enable
two routers to communicate over an asynchronous
dial backup link.