4000 Router Series Layer 2 - WAN Configuration Guide

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# Create dialer access group 1 and configure a dial access rule for it.

<RouterC> system-view

[RouterC] dialer-group 1 rule ip permit

# Configure interface Serial 2/0 to operate in asynchronous protocol mode.

[RouterC] interface serial 2/0

[RouterC-Serial2/0] physical-mode async

[RouterC-Serial2/0] async-mode protocol

# Assign an IP address to interface Serial 2/0, associate dialer access group 1 with the interface,

enable C-DDR, and configure two dial strings for calling Router A.

[RouterC-Serial2/0] ip address 100.1.1.3 255.255.255.0

[RouterC-Serial2/0] dialer circular enable

[RouterC-Serial2/0] dialer-group 1

[RouterC-Serial2/0] dialer route ip 100.1.1.1 8810048

[RouterC-Serial2/0] dialer route ip 100.1.1.1 8810049

[RouterC-Serial2/0] quit

# Enable modem dial-in and dial-out on the user interface to be used.

[RouterC] user-interface tty1

[RouterC-ui-tty1] modem enable both

B-DDR configuration example

Network requirements

As shown in Figure 42:

• 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.

Configure B-DDR to allow Router A to call Router B and Router C from multiple interfaces, but disable

Router B and Router C from calling each other.