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[Rodolfo Alonso <1995974@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When Neutron uses ML2/OVN mech driver, the router
"router_extra_attributes" register is not created.

With ML2/OVS, this register is created when it is called from:
* l3_dvr_db: to set the "dvr" flag.
* l3_hamode_db: to set the "ha" flag.
* availability_zone/router: to set the "availability_zone_hints" list

Because those methods are registered when the ML2 plugin is called as
resource extenders, every time a router is created those method are
called. Those methods always check if the child register
"router_extra_attributes" is created. If not, it is added to the session
[1].

Some projects, like n-d-r, are expecting those extra attributes in their
queries; for example: [2].

[1]https://github.com/openstack/neutron/blob/9e2a0ac058305dd16d6dedb883d305cd162f5fe4/neutron/db/l3_attrs_db.py#L48-L54
[2]https://review.opendev.org/c/openstack/neutron-dynamic-routing/+/863713

** Affects: neutron
     Importance: Medium
     Assignee: Rodolfo Alonso (rodolfo-alonso-hernandez)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => Rodolfo Alonso (rodolfo-alonso-hernandez)

** Changed in: neutron
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1995974

Title:
  [OVN] Router "router_extra_attributes" register is not created

Status in neutron:
  New

Bug description:
  When Neutron uses ML2/OVN mech driver, the router
  "router_extra_attributes" register is not created.

  With ML2/OVS, this register is created when it is called from:
  * l3_dvr_db: to set the "dvr" flag.
  * l3_hamode_db: to set the "ha" flag.
  * availability_zone/router: to set the "availability_zone_hints" list

  Because those methods are registered when the ML2 plugin is called as
  resource extenders, every time a router is created those method are
  called. Those methods always check if the child register
  "router_extra_attributes" is created. If not, it is added to the
  session [1].

  Some projects, like n-d-r, are expecting those extra attributes in
  their queries; for example: [2].

  [1]https://github.com/openstack/neutron/blob/9e2a0ac058305dd16d6dedb883d305cd162f5fe4/neutron/db/l3_attrs_db.py#L48-L54
  [2]https://review.opendev.org/c/openstack/neutron-dynamic-routing/+/863713

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