Comment 8 for bug 1714660

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Ihar Hrachyshka (ihar-hrachyshka) wrote :

It's because openstack/tripleo-quickstart-extras: 0c40d0e sets infrastructure MTU to 1350 (1500 seems to have problems in our infra), and we never tell neutron about it, so it happily creates networks with MTUs up to 1500 depending on their type.

To fix it, we should set global_physnet_mtu in neutron.conf on overcloud to 1350. It can be achieved with NeutronGlobalPhysnetMtu tripleo parameter.