Comment 8 for bug 1348788

The kilo implementation of bp/mtu-selection-and-advertisement adds a mtu attribute to the network resource in the API and the db. The ML2 type drivers calc the MTU value (subtract encap) for each segment of the network and the type manager sets the mtu DB attrib for the network to the lowest of the calc'd segment values. This value is available in the DB (and API) and could be used by the linuxbridge mech driver to do something like setting the tap-interfaces' MTUs as described in this bug.

https://blueprints.launchpad.net/neutron/+spec/mtu-selection-and-advertisement
https://review.openstack.org/#/q/status:merged+project:openstack/neutron+branch:master+topic:bp/mtu-selection-and-advertisement,n,z
https://review.openstack.org/#/c/156318
https://review.openstack.org/#/c/169406 -- https://bugs.launchpad.net/neutron/+bug/1434671 (API extension)