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# Configure the asynchronous/synchronous serial interface Serial 2/1/0 to operate in
asynchronous mode and protocol mode.
[RouterA] interface serial 2/1/0
[RouterA-Serial2/1/0] physical-mode async
[RouterA-Serial2/1/0] async-mode protocol
# Assign the IP address 1.1.1.1/16 to Serial 2/1/0.
[RouterA-Serial2/1/0] ip address 1.1.1.1 255.255.0.0
# Enable traditional DDR on Serial 2/1/0.
[RouterA-Serial2/1/0] dialer circular enable
# Assign Serial 2/1/0 to dialer access group 1.
[RouterA-Serial2/1/0] dialer-group 1
# Set the dial string for calling a remote end as 666666 on Serial 2/1/0.
[RouterA-Serial2/1/0] dialer number 666666
[RouterA-Serial2/1/0] quit
# Configure user line 1 (the user line for Serial 2/0) for both incoming and outgoing modem calls.
[RouterA] line tty 1
[RouterA-line-tty1] modem enable both
2. Configure Router B:
# Create dialer access group 1 and add a dial access rule to match call triggering traffic. The rule
in this example permits any IP packets to trigger a call.
<RouterB> system-view
[RouterB] dialer-group 1 rule ip permit
# Configure the asynchronous/synchronous serial interface Serial 2/1/0 to operate in
asynchronous mode and protocol mode.
[RouterB] interface serial 2/1/0
[RouterB-Serial2/1/0] physical-mode async
[RouterB-Serial2/1/0] async-mode protocol
# Assign the IP address 2.2.2.2/16 to Serial 2/1/0.
[RouterB-Serial2/1/0] ip address 1.1.1.1 255.255.0.0
# Enable traditional DDR on Serial 2/1/0.
[RouterB-Serial2/1/0] dialer circular enable
# Assign Serial 2/1/0 to dialer access group 1.
[RouterB-Serial2/1/0] dialer-group 1
# Set the dial string to 888888 on Serial 2/1/0.
[RouterB-Serial2/1/0] dialer number 888888
[RouterB-Serial2/1/0] quit
# Configure user line 1 (the user line for Serial 2/0) for both incoming and outgoing modem calls.
[RouterB] line tty 1
[RouterB-line-tty1] modem enable both
Verifying the configuration
Verify that Router A and Router B can ping each other on their Serial 2/0 interfaces.
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