Technical data

Step 9—Configuring the Group-Async Interface
Dial Solutions Quick Configuration Guide
2-28
Step 9—Configuring the Group-Async Interface
The group-async interface is a template, which is used to control the configuration of all the async
interfaces on the access server. Async interfaces are lines that are running in PPP mode. An async
interface uses the same number as its corresponding line. Configuring the asynchronous interfaces
as a group-async saves you time and configuration file size.
Configure
To configure the group-async interface, use the following commands beginning in global
configuration mode:
Verify
Enter the show running command. After completing Steps 1 through 9, the configuration looks
like this:
hq-sanjose# show running
Building configuration...
Current configuration:
!
version 12.0
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname hq-sanjose
!
aaa new-model
aaa authentication login default local
Step Command Purpose
1
hq-sanjose(config)# interface group-async 1
Create the group-async interface.
2
hq-sanjose(config-if)# ip unnumbered loopback 0
To conserve IP address space, configure
the asynchronous interfaces as
unnumbered.
3
hq-sanjose(config-if)# encapsulation ppp
Enable PPP.
4
hq-sanjose(config-if)# async mode interactive
Configure interactive mode on the
asynchronous interfaces. Interactive
means that users can dial in and get to a
shell or PPP session on that line.
5
hq-sanjose(config-if)# ppp authentication chap pap
Enable CHAP and PAP authentication on
the interface during LCP negotiation.
The access server first requests to
authenticate with CHAP. If CHAP is
rejected by the remote client (modem),
then PAP authentication is requested.
6
hq-sanjose(config-if)# peer default ip address pool dialin_pool
Assign dial-in clients IP addresses from
the pool named dialin_pool.
7
hq-sanjose(config-if)# no cdp enable
Disable the Cisco discovery protocol.
8
hq-sanjose(config-if)# group-range 1 96
Specify the range of asynchronous
interfaces to include in the group, which is
usually equal to the number of modems
you have in the access server.