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[Radosław Piliszek <1868137@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Comparing:
https://opendev.org/openstack/neutron/src/commit/5e84289f68402b401d9a35d93473d9517a43e300/devstack/lib/ovn_agent#L78
with:
https://opendev.org/openstack/neutron-lib/src/commit/37deb266394a5c633309b3ad66241bb02695bdb9/neutron_lib/constants.py#L325

And we get MTU errors when leaving default.
[ml2_type_geneve]/max_header_size has to be set to 38 to make Geneve encapsulation work.

Devstack does the override above so the real default is not tested.

Release: Ussuri

** Affects: neutron
     Importance: Undecided
         Status: Confirmed

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https://bugs.launchpad.net/bugs/1868137

Title:
  default geneve overhead is set not enough

Status in neutron:
  Confirmed

Bug description:
  Comparing:
  https://opendev.org/openstack/neutron/src/commit/5e84289f68402b401d9a35d93473d9517a43e300/devstack/lib/ovn_agent#L78
  with:
  https://opendev.org/openstack/neutron-lib/src/commit/37deb266394a5c633309b3ad66241bb02695bdb9/neutron_lib/constants.py#L325

  And we get MTU errors when leaving default.
  [ml2_type_geneve]/max_header_size has to be set to 38 to make Geneve encapsulation work.

  Devstack does the override above so the real default is not tested.

  Release: Ussuri

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