Description of problem: Today, existing networks may not reflect MTU configured for neutron-server, if they were created when neutron-server was using different MTU setup for its infrastructure, or when it was using bad default values for network MTUs (specifically, before Mitaka, all networks were getting MTU = 0 by default, disabling both advertisement and data path MTU size enforcement). Expected results: This fix stops persisting MTU in the database on network create and instead calculate it on every network resource fetch.
Code tested on the latest puddle openstack-neutron-8.1.2-3.el7ost
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2016-1759.html