Cisco OL-5490-01 Spezifikationen PDF herunterladen (Seite 47)

2-27

Cisco AS5x00 Case Study for Basic IP Modem Services

11/24/1999

Section 2 Commissioning the Cisco AS5300 Hardware

Testing Asynchronous-Shell Connections

Task 7. Testing Asynchronous-Shell Connections

This task verifies that the following components are working:



The physical asynchronous data path



Basic modem links



Basic IP functionality to support shell sessions

The Cisco IOS provides a command-line interface (CLI) called the EXEC.

The EXEC:



Can be accessed by dialing in with a modem



Provides access to terminal-shell services (no PPP) to do the following:

Modify configuration files

Change passwords

Troubleshoot possible problems including modem connections

Access other network resources by using telnet

During this task, some administrators try to make complex services function such as PPP-based Web

browsing. Do not jump ahead. Many other elements still need to be configured (for example, PPP and

IPCP). The asynchronous-shell test ensures that the EXEC’s login prompt can be accessed by a client

modem. Taking a layered approach to building a network isolates problems and saves you time.

Step 1

Locate a client PC, client modem, and analog line. From the client PC, open a terminal emulation

program (such as Hyper Terminal, not Dial-Up Networking) and connect to the client modem.

Figure 2-6 shows the network environment for this test.

Figure 2-6 Test Environment

Step 2

From a terminal-emulation program, test your RS-232 connection to the client modem. Enter the

command. The modem returns the prompt “OK.”

Step 3

Dial the PRI telephone number assigned to the NAS (in this example the number is 5551234). After the

modem successfully connects, a connect message appears.

atdt5551234

CONNECT 28800 V42bis

Note

Many modems support the

command, which recalls the last AT command. The

ath

command hangs up a modem call. The

atdl

command dials the last telephone

number.

Client PC

Cisco AS5300

with integrated

modems

Default

gateway

Client

modem

PSTN

POTS line PRI lines

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