I8287677c7ad0f13fa9f5cb194f9372d04b78cb61 changed the behavior of
DevStack, so that path_mtu is being set to 1500 by default. Let's take
the next step and set path_mtu to 1500 by default, instead of relying on
deployment tools like DevStack to set it.
When using the ML2 plugin and setting path_mtu to default to 1500,
the second order effect is that all Neutron
Network objects will have the mtu attribute populated. For tenant
network types like VXLAN, the MTU will be set as path_mtu less the
protocol overhead. So for example, a Neutron Network backed by VXLAN
will have the mtu attribute set to 1450.
Related-Bug: #1542108
Co-Authored-By: Matt Kassawara <mkassawara@gmail.com>
Change-Id: I4096a3e7704032fa4aa5c3aa8bcaec4e38d0d06d
7a4633a9ca