
Configuring Dial Services
B-12 114062 Rev. B
Dial Backup with PPP on the Primary Line
Figure B-3 shows Routers 1 and 2 connected via a synchronous line running PPP.
You designate this synchronous connection as a primary connection, so if it fails,
the router provides a dial backup connection.
Figure B-3. Dial Backup Configuration with PPP
Configuration of Router 1
To configure Router 1:
1. Configure a leased, synchronous interface named S11.
2. Select PPP as the WAN protocol.
3. Select IP/RIP as the LAN protocol and configure the interface as follows:
• IP Address: 129.122.3.1
• IP Adjacent Host Address: 129.122.3.2
Modem
R2
R1
S11
E11
Backup line
Raise DTR
Primary, PPP,
or Bay Networks Standard
Ethernet line (E11) = 129.122.1.1
Sync line (S331) = 129.122.3.2
S331
DS0022A
Router 1 IP addresses
Sync line (S11) = 129.122.3.1
Router 2 IP address
Modem
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