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[Slawek Kaplonski <1955121@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

During subnet update neutron validates, if gateway_ip is passed in the PUT request and if it is, validates if old gateway_ip isn't already allocated to some router's port. If it is, Neutron will forbid to update subnet.
That's totally valid behavior but in case when "new" gateway_ip is actually the same as old one Neutron should not raise exception and allow to update subnet.
It may be useful for example for some automation tools, like Heat and Tripleo which will not need to have additional logic to check if gateway_ip is actually changed or not and if it should be eventually cleaned manually.

** Affects: neutron
     Importance: Low
     Assignee: Slawek Kaplonski (slaweq)
         Status: New

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https://bugs.launchpad.net/bugs/1955121

Title:
  Update subnet with same gateway_ip as is already used should be
  allowed

Status in neutron:
  New

Bug description:
  During subnet update neutron validates, if gateway_ip is passed in the PUT request and if it is, validates if old gateway_ip isn't already allocated to some router's port. If it is, Neutron will forbid to update subnet.
  That's totally valid behavior but in case when "new" gateway_ip is actually the same as old one Neutron should not raise exception and allow to update subnet.
  It may be useful for example for some automation tools, like Heat and Tripleo which will not need to have additional logic to check if gateway_ip is actually changed or not and if it should be eventually cleaned manually.

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