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# Enable PPP encapsulation on Serial 2/1/0 (optional, as an interface uses PPP encapsulation by
default).
[RouterB] interface serial 2/1/0
[RouterB-Serial2/1/0] link-protocol ppp
# Configure the username for Router B when Router B is authenticated.
[RouterB-Serial2/1/0] ppp chap user userb
# Assign an IP address to Serial 2/1/0 of Router B.
[RouterB-Serial2/1/0] ip address 200.1.1.2 16
(Method 2) The authenticator with no username configured authenticates the peer by using CHAP.
3. Configure Router A:
# Create a user account for Router B.
<RouterA> system-view
[RouterA] local-user userb class network
# Set a password for the user account.
[RouterA-luser-network-userb] password simple hello
# Set the service type of the user account to PPP.
[RouterA-luser-network-userb] service-type ppp
[RouterA-luser-network-userb] quit
# Set the authentication mode to CHAP.
[RouterA] interface serial 2/1/0
[RouterA-Serial2/1/0] ppp authentication-mode chap domain system
# Assign an IP address to Serial 2/1/0.
[RouterA-Serial2/1/0] ip address 200.1.1.1 16
[RouterA-Serial2/1/0] quit
# Configure local authentication for the PPP users in the default ISP domain system.
[RouterA] domain system
[RouterA-isp-system] authentication ppp local
4. Configure Router B:
# Configure the username of Router B when Router B is authenticated.
<RouterB> system-view
[RouterB] interface serial 2/1/0
[RouterB-Serial2/1/0] ppp chap user userb
# Set the default CHAP password.
[RouterB-Serial2/1/0] ppp chap password simple hello
# Assign an IP address to Serial 2/1/0.
[RouterB-Serial2/1/0] ip address 200.1.1.2 16
5. Verify the configuration:
# Use the display interface serial command to display information about Serial 2/1/0 of Router B.
[RouterB-Serial2/1/0] display interface serial 2/1/0
Serial2/1/0
Current state: UP
Line protocol state: UP
Description: Serial2/1/0 Interface
Bandwidth: 64kbps
Maximum Transmit Unit: 1500
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