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Lab 4.9.1 Configuring ISDN BRI

Objective

In this lab, the student will configure two Cisco routers for DDR using ISDN BRI. The student will also

configure PPP CHAP authentication.

Scenario

The International Travel Agency (ITA) wants an ISDN DDR connection configured between a remote

office in Capetown and its corporate office known as SanJose1. For security reasons, and to keep

ISDN charges to a minimum, suggest that only Web, e-mail, FTP, Telnet, and DNS traffic activate

the link from the remote site. Also recommend configuring PPP CHAP authentication. Finally,

Capetown connects to a stub network. For this reason, suggest that static and default routes be used

between both sites.

Step 1

Before beginning this lab, it is recommended that the routers be reloaded after erasing their startup

configuration. This will prevent problems that may be caused by residual configurations.

Build and configure the network according to the diagram, but do not configure the BRI interfaces for

either router yet. Use the Adtran Atlas 550 or similar device to simulate the ISDN cloud. If the Atlas

550 is used, be sure to use straight-through cables. Connect both routers to the respective BRI

module ports of the Atlas 550 as labeled in the diagram.

Configure the hostname and FastEthernet 0/0 interfaces on each router.

Configure both workstations with their respective IP addresses and default gateways. For example,

the router Fa0/0 IP address. Have each host ping their default gateway to verify connectivity.

1 - 7 CCNP 2: Remote Access v 3.0 - Lab 4.9.1 Copyright  2003, Cisco Systems, Inc.

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Objective 1
Scenario 1

Indice de contenidos

Pagina 1 - Scenario

Lab 4.9.1 Configuring ISDN BRI Objective In this lab, the student will configure two Cisco routers for DDR using ISDN BRI. The student will also co

Pagina 2

Step 2 In global configuration mode on SanJose1, use the following to configure the username and password information for the remote router and an ena

Pagina 3

Sa nJose1(config-if)#dialer idle-timeout 60 Next, configure the DDR setting on the BRI interface. Use the dialer-group 1 command as follows, to asso

Pagina 4

The debug isdn q921 command may also be used to troubleshoot Layer 2 issues between the router and the ISDN switch. Once connectivity to the ISDN sw

Pagina 5

Idle timer (120 secs), Fast idle timer (20 secs) Wait for carrier (30 secs), Re-enable (15 secs) Dialer state is idle 4. What is the idle timer set

Pagina 6

Finally, because PPP with CHAP authentication is being used, also debug PPP as follows: SanJose1#debug ppp authentication SanJose1#debug ppp negotiat

Pagina 7

Out 5551000 SanJose1 18 44 15 0 ---------------------------------------------------------------------

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