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[Alfredo Moralejo <1901534@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

After
https://github.com/openstack/neutron/commit/ebb866310b48cbad2ae772e0551aaf994858a51e
when creating a tenant neutron without specifying mtu size with ovn
driver, it fails with error:

osc_lib.exceptions.CommandError: Error while executing command: BadRequestException: 400, Invalid input for operation: Requested MTU is too big, maximum is 1442.                             
clean_up CreateNetwork: Error while executing command: BadRequestException: 400, Invalid input for operation: Requested MTU is too big, maximum is 1442.     

Checking at neutron server logs, i see:

2020-10-26 11:17:15.592 61398 DEBUG neutron.api.extensions [req-1904932b-3ce6-48e5-8601-a746e3a546da - - - - -] Ext name="Network MTU (writable)" alias="net-mtu-writable" description="Provid
es a writable MTU attribute for a network resource." updated="2017-07-12T00:00:00-00:00" _check_extension /usr/lib/python3.6/site-packages/neutron/api/extensions.py:413                      
2020-10-26 11:17:15.593 61398 INFO neutron.api.extensions [req-1904932b-3ce6-48e5-8601-a746e3a546da - - - - -] Extension net-mtu-writable not supported by any of loaded plugins        

I've realized that in devstack tests, this is working fine because it's
enabling logger mechanism driver in addition to ovn. I understand this
driver is intended for testing and debug only and should not included in
production deployments so this is a real issue.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1901534

Title:
  Neutron fail to create networks because of MTU value

Status in neutron:
  New

Bug description:
  After
  https://github.com/openstack/neutron/commit/ebb866310b48cbad2ae772e0551aaf994858a51e
  when creating a tenant neutron without specifying mtu size with ovn
  driver, it fails with error:

  osc_lib.exceptions.CommandError: Error while executing command: BadRequestException: 400, Invalid input for operation: Requested MTU is too big, maximum is 1442.                             
  clean_up CreateNetwork: Error while executing command: BadRequestException: 400, Invalid input for operation: Requested MTU is too big, maximum is 1442.     

  Checking at neutron server logs, i see:

  2020-10-26 11:17:15.592 61398 DEBUG neutron.api.extensions [req-1904932b-3ce6-48e5-8601-a746e3a546da - - - - -] Ext name="Network MTU (writable)" alias="net-mtu-writable" description="Provid
  es a writable MTU attribute for a network resource." updated="2017-07-12T00:00:00-00:00" _check_extension /usr/lib/python3.6/site-packages/neutron/api/extensions.py:413                      
  2020-10-26 11:17:15.593 61398 INFO neutron.api.extensions [req-1904932b-3ce6-48e5-8601-a746e3a546da - - - - -] Extension net-mtu-writable not supported by any of loaded plugins        

  I've realized that in devstack tests, this is working fine because
  it's enabling logger mechanism driver in addition to ovn. I understand
  this driver is intended for testing and debug only and should not
  included in production deployments so this is a real issue.

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