I tested this 4 ways:

Using a linux bridge, using
        <interface type='direct'> <source dev='br0' mode='bridge'/>
Using a linux bridge, using
        <interface type='bridge'> <source bridge='br0'/><virtualport 
type='openvswitch''>
Using an ovs bridge, using
        <interface type='direct'> <source dev='ovsbr1' mode='bridge'/> 
<virtualport type='openvswitch''>
Using an ovs bridge, using
        <interface type='bridge'> <source bridge='ovsbr1'/><virtualport 
type='openvswitch''>

Only the ovs bridge with type='direct' failed to ping its ipv6 gateway
(fc00::1 for me).

The fact that type='direct' works with a linux bridge and not with an
ovs bridge is interesting.

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https://bugs.launchpad.net/bugs/1279176

Title:
  IPv6 fails when "<interface type='direct'>", on top of OVS

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