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#### System: Ubuntu 12.04 LTS from CD, no Updates yet
#### Following configuration in /etc/network/interfaces

auto eth4
iface eth4 inet manual
        bond-master bond0
auto eth6
iface eth6 inet manual
        bond-master bond0
auto bond0
iface bond0 inet manual
        bond-slaves eth4 eth6
        bond-mode active-passive
        bond-miimon 100
# now trying to configure vlans on the bond
auto bond0.84
iface bond0.84 inet static
        address 10.173.0.172
        netmask 255.255.254.0
        gateway 10.173.0.1
        vlan-raw-device bond0

#### After a "sudo service networking restart",
#### this leads to the following error in /var/log/syslog:
Jun 1 12:26:29 tom kernel: [755177.614852] 8021q: VLANs not supported on bond0