Bug#870633: ifenslave: Option bond-mode does not work

[Александр Чумаков]

I also have same issue.
In /etc/network/interfaces I've set mode 802.3ad
/proc/net/bonding/bond0 shows me roubd-robin mode

Same issue was fixed in ifenslave-2.6 (Ubuntu)
https://bugs.launchpad.net/ubuntu/+source/ifenslave/+bug/1280366