4000 Router Series Layer 2 - WAN Configuration Guide

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# Assign an IP address to the serial interface.

[RouterD-Serial2/0:15] ip address 100.1.1.254 255.255.255.0

# Configure PPP encapsulation and other PPP parameters on the serial interface.

[RouterD-Serial2/0:15] link-protocol ppp

[RouterD-Serial2/0:15] ppp authentication-mode chap

[RouterD-Serial2/0:15] ppp chap user userd

[RouterD-Serial2/0:15] remote address pool 1

[RouterD-Serial2/0:15] quit

# Configure an IP address pool for assigning addresses to PPP users.

[RouterD] domain system

[RouterD-isp-system] ip pool 1 100.1.1.1 100.1.1.16

[RouterD-isp-system] quit

Dynamic route backup with C-DDR configuration example

Network requirements

As shown in Figure 49, Router A and Router B are directly connected through their serial interfaces

running PPP. They can also call each other through ISDN. The telephone number of Router B is 8810052.

Enable dynamic route backup on Router A to monitor network segment 40.0.0.0/8 on Router B.

Figure 49 Network diagram

Configuration procedure

1. Configure Router A:

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

<RouterA> system-view

[RouterA] dialer-group 1 rule ip permit

# Configure dialup parameters for interface BRI 3/0.

[RouterA] interface bri 3/0

[RouterA-Bri3/0] ip address 20.0.0.1 8

[RouterA-Bri3/0] dialer circular enable

[RouterA-Bri3/0] dialer-group 1

[RouterA-Bri3/0] dialer route ip 30.0.0.1 8810052

[RouterA-Bri3/0] quit

# Configure interface Serial 2/0.

[RouterA] interface serial 2/0