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0e1f616
(Get the code!)
My environment is Ubuntu 14.04, with a source install of OpenStack Juno. I am running Linuxbridges using VXLAN for tunnels.
There is clearly a problem, HA routers keepalived changes are not reflected in the fdb's on the various nodes. If the l3 node that is showing to be master in the keepalived process fails and causes another l3 node to be the new master, the fbd tables are never changed on the various nodes causing a communications failure for the VMs.
Also if the master network node (as decided by the keepalived processes) is rebooted, keepalived detects the failure and moves the VIP to a new node. Once the rebooted node comes on-line and reports that it is well, neutron sets up the router namespace and the keepalived and conntrackd processes on this node, l2pop also sees the new node and sets the fdb's on all nodes to point this node that just came alive. This causes the VMs to lose communication.