Specifications

Configuring Asynchronous Lines and Interfaces
How to Configure Asynchronous Interfaces and Lines
DC-21
Cisco IOS Dial Technologies Configuration Guide
The “Group and Member Asynchronous Interface Examples” section later in this chapter contains an
example of how to configure a group interface.
Verifying the Group Interface Configuration
To verify the group interface configuration and check if one of the asynchronous interfaces is up, use the
show interface async command:
Router# show interface async 1
Async1 is up, line protocol is up
modem(slot/port)=1/0, csm_state(0x00000204)=CSM_IC4_CONNECTED, bchan_num=18
modem_status(0x0002): VDEV_STATUS_ACTIVE_CALL.
Hardware is Async Serial
Interface is unnumbered. Using address of FastEthernet0 (10.1.1.10)
MTU 1500 bytes, BW 115 Kbit, DLY 100000 usec, rely 255/255, load 1/255
Encapsulation PPP, loopback not set, keepalive not set
DTR is pulsed for 5 seconds on reset
LCP Open
Open: IPCP
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/5, 0 drops; input queue 1/5, 0 drops
5 minute input rate 37000 bits/sec, 87 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
31063 packets input, 1459806 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
33 packets output, 1998 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
Step 4
Router(config-if)# async mode interactive
Configures interactive mode on the asynchronous
interface.
Step 5
Router(config-if)# ppp authentication chap pap
list-name
Enables CHAP and PAP authentication on the interface.
Replace the list-name variable with a specified
authentication list name.
2
Step 6
Router(config-if)# peer default ip address pool
poolname
Assigns dial-in clients IP addresses from an address
pool.
3
Step 7
Router(config-if)# no cdp enable
Disables the Cisco Discovery Protocol (CDP) on the
interface.
Step 8
Router(config-if)# group-range low-end-of-range
high-end-of-range
Specifies 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.
Step 9
Router(config-if)# exit
Returns to global configuration mode.
1. You can also specify the Ethernet interface to conserver address space. In this case, enter the ip unnumbered ethernet 0 command.
2. To create a string used to name the following list of authentication methods tried when a user logs in, refer to the aaa authentication ppp
command. Authentication methods include RADIUS, TACACS+, and Kerberos.
3. To create an IP address pool, refer to the ip local pool global configuration command.
Command Purpose