Comment 50 for bug 1337873

Thank you for the report sirswa.

I have analyzed your config and came to some conclusions. You may want to consider using one of the approaches below:
* giving up on bonding and replacing it with bridging in STP mode (please consult the man pages at http://manpages.ubuntu.com/cgi-bin/search.py?q=brctl)
* implementing your VLANs on top of the bonding interfaces instead of physical interfaces (i.e. defining bond104.104, bond944.944 and bond945.945 istead of p5p1.104, p5p1.944 etc.). The configuration you were using places the VLAN layer below the bonding layer and could produce unexpected behaviour. Please use the approach described here as reference: https://www.stgraber.org/2012/01/04/networking-in-ubuntu-12-04-lts/
https://www.kernel.org/doc/Documentation/networking/bonding.txt

I am aware that the configuration you are using was working before, but despite this fact it was never supported. The latest changes made to ifupdown just exposed that fact.