#eth0 is manually configured, and slave to the "bond0" bonded NIC
auto eth0
iface eth0 inet manual
bond-master bond0
bond-primary eth0

#eth1 ditto, thus creating a 2-link bond.
auto eth1
iface eth1 inet manual
bond-master bond0

# bond0 is the bonding NIC and can be used like any other normal NIC.
# bond0 is configured using static network information.
auto bond0
iface bond0 inet static
address 192.168.1.10
gateway 192.168.1.1
netmask 255.255.255.0
bond-mode active-backup
bond-miimon 100
bond-slaves none