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[venkata anil <anil.venkata@xxxxxxxxxxxx>]

Public bug reported:

In OVN driver, traffic from vlan (or any other) tenant network to
external network uses a geneve tunnel between the compute node and the
gateway node. So MTU for the VLAN networks needs to account for geneve
tunnel overhead.

This doc [1] explains about OVN vlan networks and current issue and future enhancements.
There is ovs-discuss mailing list thread [2] discussing the surprising geneve tunnel usage.

[1] https://docs.google.com/document/d/1JecGIXPH0RAqfGvD0nmtBdEU1zflHACp8WSRnKCFSgg/edit#heading=h.st3xgs77kfx4
[2] https://mail.openvswitch.org/pipermail/ovs-discuss/2018-April/046543.html

** Affects: neutron
     Importance: Undecided
     Assignee: venkata anil (anil-venkata)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => venkata anil (anil-venkata)

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https://bugs.launchpad.net/bugs/1765691

Title:
  OVN vlan networks use geneve tunneling for SNAT traffic

Status in neutron:
  New

Bug description:
  In OVN driver, traffic from vlan (or any other) tenant network to
  external network uses a geneve tunnel between the compute node and the
  gateway node. So MTU for the VLAN networks needs to account for geneve
  tunnel overhead.

  This doc [1] explains about OVN vlan networks and current issue and future enhancements.
  There is ovs-discuss mailing list thread [2] discussing the surprising geneve tunnel usage.

  [1] https://docs.google.com/document/d/1JecGIXPH0RAqfGvD0nmtBdEU1zflHACp8WSRnKCFSgg/edit#heading=h.st3xgs77kfx4
  [2] https://mail.openvswitch.org/pipermail/ovs-discuss/2018-April/046543.html

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