4000 Router Series Layer 2 - WAN Configuration Guide

[RouterA] interface serial 2/0

[RouterA-Serial2/0] link-protocol ppp

# Set the authentication mode to PAP.

[RouterA-Serial2/0] ppp authentication-mode pap domain system

# Assign an IP address to Serial 2/0.

[RouterA-Serial2/0] ip address 200.1.1.1 16

[RouterA-Serial2/0] quit

# Configure local authentication for the PPP users in the default ISP domain system.

[RouterA] domain system

[RouterA-isp-system] authentication ppp local

2. Configure Router B:

# Enable PPP encapsulation on Serial 2/0 (optional, because an interface uses PPP encapsulation

by default).

<RouterB> system-view

[RouterB] interface serial 2/0

[RouterB-Serial2/0] link-protocol ppp

# Configure the PAP username and password sent from Router B to Router A when Router B is

authenticated by Router A using PAP.

[RouterB-Serial2/0] ppp pap local-user userb password simple passb

# Assign an IP address to Serial 2/0 of Router B.

[RouterB-Serial2/0] ip address 200.1.1.2 16

3. Verify the configuration:

Use the display interface serial command to display information about Serial 2/0 of Router B. The

physical layer status and link layer status of the interface are both up, and the states of LCP and

IPCP are both Opened, indicating PPP negotiation is successful. Router A and Router B can ping

each other.

[RouterB-Serial2/0] display interface serial 2/0

Serial2/0

Current state: UP

Line protocol state: UP

Description: Serial2/0 Interface

Bandwidth: 64kbps

Maximum Transmit Unit: 1500

Internet Address: 200.1.1.2/16 Primary

Link layer protocol: PPP

LCP: opened, IPCP: opened

…

[RouterB-Serial2/0] ping 200.1.1.1

5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss Ping 200.1.1.1

(200.1.1.1): 56 data bytes, press escape sequence to break

56 bytes from 200.1.1.1: icmp_seq=0 ttl=128 time=3.197 ms

56 bytes from 200.1.1.1: icmp_seq=1 ttl=128 time=2.594 ms

56 bytes from 200.1.1.1: icmp_seq=2 ttl=128 time=2.739 ms

56 bytes from 200.1.1.1: icmp_seq=3 ttl=128 time=1.738 ms

56 bytes from 200.1.1.1: icmp_seq=4 ttl=128 time=1.744 ms

--- Ping statistics for 200.1.1.1 ---