164
[RouterA-Serial2/0] dialer enable-circular
[RouterA-Serial2/0] dialer-group 1
[RouterA-Serial2/0] dialer route ip 100.1.1.2 8810052
[RouterA-Serial2/0] link-protocol ppp
[RouterA-Serial2/0] ppp pap local-user usera password simple usera
# Specify interface Serial 2/0 as the callback client.
[RouterA-Serial2/0] ppp callback client
[RouterA-Serial2/0] dialer timer enable 15
[RouterA-Serial2/0] quit
# Configure the user interface to be used and enable modem dial-in and dial-out on it.
[RouterA] user-interface tty1
[RouterA-ui-tty1] modem both
d. Configure Router B:
# Configure a dial access control rule for dialer access group 2. Create a local user account
usera for Router A and configure PPP authentication for it, and configure the dial string for
callback.
<RouterB> system-view
[RouterB] dialer-rule 2 ip permit
[RouterB] local-user usera
[RouterB-luser-usera] password simple usera
[RouterB-luser-usera] service-type ppp
[RouterB-luser-usera] authorization-attribute callback-number 8810048
[RouterB-luser-usera] quit
# Assign an IP address to interface Serial 2/0 and configure physical and C-DCC
parameters.
[RouterB] interface serial 2/0
[RouterB-Serial2/0] ip address 100.1.1.2 255.255.255.0
[RouterB-Serial2/0] physical-mode async
[RouterB-Serial2/0] async mode protocol
[RouterB-Serial2/0] dialer enable-circular
[RouterB-Serial2/0] dialer-group 2
[RouterB-Serial2/0] dialer route ip 100.1.1.1 user usera 8810048
# Specify the local end as the callback server, and set the callback reference to dial number.
DCC identifies the dial string for callback by comparing the remote username obtained
through PPP authentication against the local user database for a match.
[RouterB-Serial2/0] dialer callback-center dial-number
[RouterB-Serial2/0] link-protocol ppp
[RouterB-Serial2/0] ppp authentication-mode pap
[RouterB-Serial2/0] ppp callback server
[RouterB-Serial2/0] quit
# Configure the user interface to be used and enable modem dial-in and dial-out on it.
[RouterB] user-interface tty2
[RouterB-ui-tty2] modem both
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