Using Adsl As Backup Line; Accessing The Internet Through An Adsl Interface - 3Com MSR 50 Series Configuration Manual

Using ADSL as Backup
Line
Accessing the Internet
through an ADSL
Interface
Network requirements
The 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 to
the DDN dedicated line, the router can still initiate a PPPoE call and access the
network center via the ADSL. If there is no packet transmission on ADSL for 2
minutes, the PPPoE session will terminate automatically. Later on, if there are new
packets that need forwarding, the PPPoE session will be recreated.
Network diagram
Figure 103 Network diagram for using ADSL as backup line
Modem
Eth 1 / 0
S 2 / 0
Router DDN
Configuration procedure
Configure 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 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 70
Network requirements
The router has an ADSL interface ATM 1/0, through which it can access the
Internet directly rather than via an ADSL modem.
PPPoE Configuration Example
ADSL
Network Center
403