PPPoE Configuration Example 403Using ADSL as BackupLineNetwork requirementsThe router is connected to the network center via DDN dedicated line and ADSL,where the ADSL is the backup of the DDN dedicated line. When a fault occurs tothe DDN dedicated line, the router can still initiate a PPPoE call and access thenetwork center via the ADSL. If there is no packet transmission on ADSL for 2minutes, the PPPoE session will terminate automatically. Later on, if there are newpackets that need forwarding, the PPPoE session will be recreated.Network diagramFigure 103 Network diagram for using ADSL as backup lineConfiguration procedureConfigure the router:# Configure a dialer interface. 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 2/0[Router-Ethernet2/0] pppoe-client dial-bundle-number 1 idle-timeout 120[Router-Ethernet2/0] 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 route to the peer.[Router] ip route 0.0.0.0 0 serial 1/0 preference 60[Router] ip route 0.0.0.0 0 dialer 1 preference 70Accessing the Internetthrough an ADSLInterfaceNetwork requirementsThe router has an ADSL interface ATM 1/0, through which it can access theInternet directly rather than via an ADSL modem.RouterModemEth 1/0Network CenterS2/ 0ADSLDDN
