This chapter describes how to configure a Cisco 1600 series router to dial into a central-site router over a standard telephone line and provides verification steps and troubleshooting tips.
This chapter contains the following sections:
The configurations in this chapter are based on the following assumptions:
- Your Cisco 1600 hardware is correctly installed according to the Cisco 1600 Series Hardware Installation Guide that came with the router.
- Your Cisco 1600 is dialing into a central-site router.
- Your Cisco 1600 is using Point-to-Point Protocol (PPP).
Before you begin configuration, be aware of the following:
- You need to enter the commands in the order shown in the task tables.
- The values shown in italics are examples. You should substitute the values shown with values that are appropriate for your network.
- You should be familiar with Cisco IOS software and its conventions.
Note In order to use the verification steps described in this chapter, you must be familiar with Cisco IOS commands and command modes. When you use the verification steps, you need to change to different command modes. If you are not familiar with command modes, refer to the
"Understanding Command Modes" section in the
"Cisco IOS Basic Skills" chapter.
In this configuration, a modem is attached to the routers serial port and dials into the central-site router over a standard telephone line, which is an asynchronous connection.
These are the major tasks when configuring your router for an asynchronous WAN connection:
Figure 4-1 illustrates the example configuration used in this chapter.
Figure 4-1: Asynchronous Example Configuration
Use this table to configure some global parameters on the router, including enabling IPX routing on the router (the default setting for the router is IPX routing disabled) and creating a chat script for the modem that is attached to the router.
| Step
| Task
| Router Prompt
| Command
|
|
| Enter configuration mode.
| Router#
| configure terminal
|
|
| Configure the router to show the date and time of all debug messages.
This command is optional, but recommended if you use debug commands to troubleshoot your configuration.
| Router(config)#
| service timestamps debug datetime msec
|
|
| Configure the router to show the date and time of all log messages.
This command is optional, but recommended if you use the verification steps described in this guide. This feature is enabled for all the example command output shown in this guide.
| Router(config)#
| service timestamps log datetime msec
|
|
| Enable IPX routing and configure the router with an IPX address.
| Router(config)#
| ipx routing 0060.834f.66dd
|
|
| Create a script that causes the modem connected to the router to place a call to the central site.
| Router(config)#
| chat-script dialout " " atdt\t timeout 60 connect\c
|
Use this table to configure the router with some security measures, including the password used to access the router and the username and password used for Challenge Handshake Authentication Protocol (CHAP) and Password Authentication Protocol (PAP) authentication with the central-site router.
| Step
| Task
| Router Prompt
| Command
|
|
| Specify a password to prevent unauthorized access to the router.
| Router(config)#
| enable password 1600user
|
|
| Configure the router with a host name, which is used in prompts and default configuration file names.
For PPP authentication, the host name entered with this command must match the username of the central-site router.
| Router(config)#
| hostname 1600
|
|
| Specify the password used during caller identification and CHAP and PAP authentication.
For CHAP and PAP authentication, the username entered with this command must match the host name of the central-site router.
| 1600(config)#
| username HQ password guessme
|
Use this table to configure the Ethernet interface (which connects the router to your local network) with an IP address. This gives your router a unique address on your local network.
| Step
| Task
| Router Prompt
| Command
|
|
| Enter configuration mode for the Ethernet interface.
| 1600(config)#
| interface Ethernet0
|
|
| Configure this interface with an IP address and a subnet mask.
| 1600(config-if)#
| ip address 172.16.25.42 255.255.255.224
|
|
| Configure an IPX network address for this interface.
| 1600(config-if)#
| ipx network ABC
|
|
| Enable the interface and the configuration changes that you have just made on the interface.
| 1600(config-if)#
| no shutdown
|
|
| Exit configuration mode for the interface.
| 1600(config-if)#
| exit
|
Use this table to configure the asynchronous interface for the following:
- Asynchronous data connection on the router serial interface.
- IP and IPX addresses.
- DDR routing on this interface.
- PPP packet encapsulation, so that the router can use specific PPP functions.
- PPP authentication, so that the router is authenticated by the central-site router using a standard PPP authentication method, Challenge Handshake Authentication Protocol (CHAP).
| Step
| Task
| Router Prompt
| Command
|
|
| Enter configuration mode for the serial interface.
| 1600(config)#
| interface Serial0
|
|
| Specify the mode of this slow-speed serial interface as asynchronous.
| 1600(config-if)#
| physical-layer async
|
|
| Configure this interface with an IP address and a subnet mask.
| 1600(config-if)#
| ip address 192.168.39.41 255.255.255.0
|
|
| Enable IPX routing on this interface.
| 1600(config-if)#
| ipx network 9876
|
|
| Specify that dial-on-demand routing (DDR) is supported on this interface.
| 1600(config-if)#
| dialer in-band
|
|
| Configure a static route to the central-site device.
| 1600(config-if)#
| ipx route 1234 9876.0000.0c06.ecc6
|
|
| Enable snapshot routing. Because your router is dialing into a central-site router, it is considered the client router.
The first number is the amount of "active time" (in minutes) during which routing updates are exchanged between your router and the central-site router.
The second number is the amount of "quiet time" (in minutes) during which routing entries are frozen and remain unchanged.
| 1600(config-if)#
| snapshot client 5 60
|
|
| Assign the dialer interface to a dialer group.
| 1600(config-if)#
| dialer-group 1
|
|
| Set the encapsulation method on this interface to PPP.
| 1600(config-if)#
| encapsulation ppp
|
|
| Enable CHAP or PAP authentication on this interface. CHAP authentication is attempted first.
| 1600(config-if)#
| ppp authentication chap pap callin
|
|
| Enable the interface and the configuration changes that you have just made on the interface.
| 1600(config-if)#
| no shutdown
|
|
| Exit configuration mode for this interface.
| 1600(config-if)#
| exit
|
You can verify your configuration to this point by
Step 1 From the privileged EXEC command mode, enter the ping command followed by the IP address of the central-site router:
Note The modem might need time to synchronize with the central-site modem. You might have to enter the ping command several times before you get a response.
1600# ping 192.168.37.40
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.37.40, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 40/43/48 ms
1600#
*Mar 1 03:37:46.526: %LINK-3-UPDOWN: Interface BRI0:1, changed state to up
*Mar 1 03:37:46.923: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, changed state to up
*Mar 1 03:37:46.939: %LINK-3-UPDOWN: Interface Virtual-Access1, changed state to up
*Mar 1 03:37:47.923: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access1, changed state to up
*Mar 1 03:35:57.217: %ISDN-6-CONNECT: Interface BRI0:1 is now connected to 5552053 HQ
Step 2 Note the percentage in the "Success rate..." line (shown in bold in the example). A success rate of 60 percent (3/5) or greater means that your router is successfully transferring data to the central-site router.
Step 3 To continue configuration, re-enter global configuration mode.
Step 1 From the privileged EXEC command mode, enter the show interface serial 0 command.
Step 2 Confirm that the lines (shown in bold in the example) appear in the command output:
1600# show interface serial 0
Serial0 is up, line protocol is up
Hardware is QUICC Serial in async mode (TTY1)
Internet address is 192.168.39.41/24
MTU 1500 bytes, BW 9 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, multilink open
Open: ipcp
Last input never, output never, output hang never Last clearing of "show interface" counters never Queueing strategy: fifo
Output queue 0/10, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants 2 input errors, 0 CRC, 2 frame, 0 overrun, 0 ignored, 0 abort 0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets 0 output buffer failures, 0 output buffers swapped out 0 carrier transitions
Step 3 To continue configuration, re-enter global configuration mode.
Use this table to configure some parameters that tell the router how and when to dial into the central-site router.
| Step
| Task
| Router Prompt
| Command
|
|
| Define a dialer map for snapshot routing.
| 1600(config)#
| dialer map snapshot 1 name HQ
|
|
| Configure a dialer map to send IP data over the modem line to the central-site router.
| 1600(config)#
| dialer map ip 192.168.39.40 name HQ modem-script dialout 5552053
|
|
| Configure a dialer map to send IPX data over the modem line to the central-site router.
| 1600(config)#
| dialer map ipx 9876.0000.0c06.ecc6 modem-script dialout 5552053
|
|
| Configure a route to IPX services, such as servers and printers, on the central-site network.
| 1600(config)#
| ipx sap 4 HQ server AA 1234.0000.0000.0001 2
|
Use this table to configure some parameters that control access to the router, including the type of terminal line used with the router, how long the router waits for a user entry before it times out, and the password used to start a terminal session with the router.
| Step
| Task
| Router Prompt
| Command
|
|---|
|
| Specify the console terminal line.
| 1600(config)#
| line console 0
|
|
| Set the interval that the EXEC command interpreter waits until user input is detected.
| 1600(config-line)#
| exec-timeout 5
|
|
| Specify a virtual terminal for remote console access
| 1600(config-line)#
| line vty 0 4
|
|
| Specify a password on the line.
| 1600(config-line)#
| password lineaccess
|
|
| Enable password checking at terminal session login.
| 1600(config-line)#
| login
|
|
| Exit configuration mode.
| 1600(config-line)#
| end
|
If you are having problems or the output that you received during the verification steps is very different from what is shown, you can troubleshoot your router with the Cisco IOS debug commands. The debug commands provide extensive command output that is not included in this document.
Following are the debug commands that are helpful when troubleshooting asynchronous configurations. Follow these commands with the ping command to begin debug output:
- debug modem
- debug chat-script
- debug dialer
- debug ppp negotiation
