neutron/releasenotes/notes/fix-mtu-for-existing-networ...

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features:
- net-mtu extension now recalculates network MTU on each network access, not
just on creation. It now allows operators to tweak MTU related
configuration options and see them applied to all network resources right
after controller restart, both old and new.
upgrade:
- Existing networks with MTU values that don't reflect configuration
will receive new MTU values after controller upgrade. Note that to
propagate new correct MTU values to your backend, you may need to resync
all agents that set up ports, as well as re-attach VIFs to affected
instances.