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[Frode Nordahl <2002993@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

As documented in the Neutron API [0], it is allowed to create a subnet
without a gateway_ip.

This may be useful if you want to control the routes using the
extraroutes API [1].

At present the Neutron OVN driver will create a default route with an
empty dst-ip in the OVN database in case of the gateway_ip not being
set.

I believe this is a bug and that the Neutron OVN driver should omit
creating the route when no gateway_ip is set.

0: https://docs.openstack.org/api-ref/network/v2/index.html?expanded=create-subnet-detail#create-subnet
1: https://docs.openstack.org/api-ref/network/v2/index.html?expanded=create-subnet-detail,add-extra-routes-to-router-detail,remove-interface-from-router-detail#add-extra-routes-to-router

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2002993

Title:
  [ovn] default gateway populated with empty dst-ip when gateway
  explicitly disabled on subnet

Status in neutron:
  New

Bug description:
  As documented in the Neutron API [0], it is allowed to create a subnet
  without a gateway_ip.

  This may be useful if you want to control the routes using the
  extraroutes API [1].

  At present the Neutron OVN driver will create a default route with an
  empty dst-ip in the OVN database in case of the gateway_ip not being
  set.

  I believe this is a bug and that the Neutron OVN driver should omit
  creating the route when no gateway_ip is set.

  0: https://docs.openstack.org/api-ref/network/v2/index.html?expanded=create-subnet-detail#create-subnet
  1: https://docs.openstack.org/api-ref/network/v2/index.html?expanded=create-subnet-detail,add-extra-routes-to-router-detail,remove-interface-from-router-detail#add-extra-routes-to-router

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