Cisco AS5800 Specifications Page 109

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3-27
Cisco AS5800 Operations, Administration, Maintenance, and Provisioning Guide
DOC-7810814=
Chapter 3 Operations
Configuring PPP and Authentication
Configuring LCP Options
The group-async interface is a template that controls the configuration of all the asynchronous interfaces
in the NAS.
Asynchronous interfaces:
Are lines that can run in PPP mode
Use the same number as its corresponding line
Save you time and configuration file size by configuring the asynchronous interfaces as a
group-async
The client PPP framing must match the Cisco IOS interface. Figure 3-8 shows this concept.
Figure 3-8 Modem Dialup PPP Framing
The following group-async configuration applies to asynchronous interfaces 1/2/00 through 1/10/143:
!
interface Group-Async0
ip unnumbered FastEthernet0/1/0
encapsulation ppp
async mode interactive
ppp authentication chap pap
peer default ip address pool addr-pool
no cdp enable
no ip directed-broadcast
group-range 1/2/00 1/10/143
!
Table 3-6 describes the previous configuration snippet in more detail:
33187
RS-232
Async PPP
Client
modem
Cisco AS5x00
group-async
Client
PC
POTS PRI
PSTN
Table 3-6 Interface Group Async Command Descriptions
Command Purpose
ip unnumbered FastEthernet0/1/0
Conserves IP address space by configuring the
asynchronous interfaces as unnumbered.
encapsulation ppp
Enables PPP.
async mode interactive
Configures interactive mode on the asynchronous
interfaces. Interactive means that users can dial in and get
to a shell or PPP session on that line.
ppp authentication chap pap
Enables CHAP and PAP authentication on the interface
during LCP negotiation. The NAS first requests to
authenticate with CHAP. If CHAP is rejected by the remote
client (modem), then PAP authentication is requested.
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