auto lo
iface lo inet loopback

# Bond interface with LACP (802.3ad)
auto bond0
iface bond0 inet manual
    bond-mode 4
    bond-miimon 100
    bond-lacp-rate 1
    bond-slaves eth1 eth2

# VLAN 40 on bond0
auto bond0.40
iface bond0.40 inet static
    address 10.40.40.101
    netmask 255.255.255.0
    vlan-raw-device bond0