4000 Router Series Layer 2 - WAN Configuration Guide

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# Set interface Serial 2/0 to operate in asynchronous protocol mode, configure information for

PPP authentication, and assign the interface to dialer 0.

[RouterC] interface serial 2/0

[RouterC-Serial2/0] physical-mode async

[RouterC-Serial2/0] async-mode protocol

[RouterC-Serial2/0] dialer bundle-member 0

[RouterC-Serial2/0] link-protocol ppp

[RouterC-Serial2/0] ppp authentication-mode pap

[RouterC-Serial2/0] ppp pap local-user userc password simple userc

[RouterC-Serial2/0] quit

# Configure the user interface to be used, and enable modem dial-in and dial-out on it.

[RouterC] user-interface tty1

[RouterC-ui-tty1] modem enable both

Configuration example for DDR on ISDN

Network requirements

Figure 43 shows the following scenario for C-DDR implementation:

• On Router A, interface BRI 1/0 is assigned an IP address 100.1.1.1/24.

• On Router B, interface BRI 1/0 is assigned an IP address 100.1.1.2/24.

• On Router C, interface BRI 1/0 is assigned an IP address 100.1.1.3/24.

• The BRI 1/0 interfaces on these routers are located on the same network segment.

Figure 44 sho

ws the following scenario for B-DDR implementation:

• On Router A, interface Dialer 0 is assigned an IP address 100.1.1.1/24 and Dialer 1 an IP address

122.1.1.1 /24 .

• On Router B, interface Dialer 0 is assigned an IP address 100.1.1.2/24.

• On Router C, interface Dialer 0 is assigned an IP address 122.1.1.2/24.

• The Dialer 0 interfaces on Router A and Router B are located on the same network segment. The

Dialer 1 interface on Router A and the Dialer 0 interface on Router C are also located on the same

network segment.

Allow Router A to call Router B and Router C from multiple interfaces, but disable Router B and Router C

from calling each other in both C-DDR and B-DDR approaches.