Specifications

Configuring Asynchronous Lines and Interfaces
How to Configure Asynchronous Interfaces and Lines
DC-20
Cisco IOS Dial Technologies Configuration Guide
To monitor and maintain asynchronous activity, use the following commands in privileged EXEC mode
as needed:
To debug asynchronous interfaces, use the following debug command in privileged EXEC mode:
To debug PPP links, use the following debug commands in privileged EXEC mode as needed:
Creating a Group Asynchronous Interface
Create a group asynchronous interface to project a set of core protocol characteristics to a range of
asynchronous interfaces. Configuring the asynchronous interfaces as a group saves you time. Analog
modem calls cannot enter the access server without this configuration.
To configure a group asynchronous interface, use the following commands beginning in global
configuration mode:
Command Purpose
Router# clear line line-number
Returns a line to its idle state.
Router# show async bootp
Displays parameters that have been set for extended BOOTP
requests.
Router# show async status
Displays statistics for asynchronous interface activity.
Router# show line [ line-number ]
Displays the status of asynchronous line connections.
Command Purpose
Router# debug async {framing | state | packets}
Displays errors, changes in interface state, and log input and
output.
Command Purpose
Router# debug ppp negotiation
Enables debugging of PPP protocol negotiation
process.
Router# debug ppp error
Displays PPP protocol errors.
Router# debug ppp packet
Displays PPP packets sent and received.
Router# debug ppp chap
Displays errors encountered during remote or local
system authentication.
Command Purpose
Step 1
Router(config)# interface async number
Brings up a single asynchronous interface and enters
interface configuration mode.
Step 2
Router(config-if)# ip unnumbered loopback number
Configures the asynchronous interfaces as unnumbered
and assigns the IP address of the loopback interface to
them to conserve IP addresses.
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Step 3
Router(config-if)# encapsulation ppp
Enables PPP to run on the asynchronous interfaces in
the group.