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Configuration example for using ADSL to provide backup
connections
Network requirements
As shown in Figure 15, Router is connected to Network Center through a DDN dedicated line and an
ADSL connection, where the ADSL connection provides backup for the DDN dedicated line. When
the DDN dedicated line fails, the Router initiates a PPPoE call to establish an ADSL connection to
the Network Center on the demand of data transmitting. The ADSL connection is terminated when it
idled for 2 minutes.
Figure 15 Network diagram
Configuring the router
# Configure a dialer interface.
<Router> system-view
[Router] dialer-rule 1 ip permit
[Router] interface dialer 1
[Router-Dialer1] dialer user user1
[Router-Dialer1] dialer-group 1
[Router-Dialer1] dialer bundle 1
[Router-Dialer1] ip address ppp-negotiate
# Configure a PPPoE session.
[Router-Dialer1] interface ethernet 1/1
[Router-Ethernet1/1] pppoe-client dial-bundle-number 1 idle-timeout 120
[Router-Ethernet1/1] quit
# Configure the DDN interface Serial 2/0.
[Router] interface serial 2/0
[Router-Serial2/0] ip address 10.1.1.1 255.255.255.0
[Router-Serial2/0] standby interface dialer 1
[Router-Serial2/0] quit
# Configure the static routes to the peer.
[Router] ip route-static 0.0.0.0 0 serial 2/0 preference 60
[Router] ip route-static 0.0.0.0 0 dialer 1 preference 70
Configuration example for accessing the Internet through an
ADSL interface
Network requirements
As shown in Figure 16, ATM 1/0 on Router is used as an ADSL interface, through which Router can
access the Internet directly without an ADSL modem.
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