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[Rodolfo Alonso <2101162@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Since [1][2][3] it is possible to set a tunnelled network as a gateway
network for a router. The router will be pinned to a chassis in order to
bind the gateway ``Logical_Router_Port`` (GW LRP) to this chassis. In
[3], a HA implementation was done using the list provided by a router
associated ``HA_Chassis_Group``.

However, this implementation requires Neutron to update the pinned
chassis manually when a change in the HA_Chassis_Group happens; for
example, when a ``Chassis`` is removed from the database. But if a node
fails and the ``Chassis`` is not removed from the database, this HA
implementation will fail.

This bug proposes a more robust method that is not to pin the
``Logical_Router`` but to assign the ``HA_Chassis_Group`` to the GW LRP.
That provides a more robust HA support as long as OVN checks the chassis
interfaces, if one fails, it changes the GW LRP binding.

[1]https://bugs.launchpad.net/neutron/+bug/2052821
[2]https://review.opendev.org/c/openstack/neutron/+/909194
[3]https://review.opendev.org/c/openstack/neutron/+/909437

Jira reference: https://issues.redhat.com/browse/OSPRH-12265

** 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

** Description changed:

  Since [1][2][3] it is possible to set a tunnelled network as a gateway
  network for a router. The router will be pinned to a chassis in order to
  bind the gateway ``Logical_Router_Port`` (GW LRP) to this chassis. In
  [3], a HA implementation was done using the list provided by a router
  associated ``HA_Chassis_Group``.
  
  However, this implementation requires Neutron to update the pinned
  chassis manually when a change in the HA_Chassis_Group happens; for
  example, when a ``Chassis`` is removed from the database. But if a node
  fails and the ``Chassis`` is not removed from the database, this HA
  implementation will fail.
  
  This bug proposes a more robust method that is not to pin the
  ``Logical_Router`` but to assign the ``HA_Chassis_Group`` to the GW LRP.
  That provides a more robust HA support as long as OVN checks the chassis
  interfaces, if one fails, it changes the GW LRP binding.
  
  [1]https://bugs.launchpad.net/neutron/+bug/2052821
  [2]https://review.opendev.org/c/openstack/neutron/+/909194
  [3]https://review.opendev.org/c/openstack/neutron/+/909437
+ 
+ Jira reference: https://issues.redhat.com/browse/OSPRH-12265

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https://bugs.launchpad.net/bugs/2101162

Title:
  [OVN] Use HA_Chassis_Group for tunnelled gateway network LRPs

Status in neutron:
  New

Bug description:
  Since [1][2][3] it is possible to set a tunnelled network as a gateway
  network for a router. The router will be pinned to a chassis in order
  to bind the gateway ``Logical_Router_Port`` (GW LRP) to this chassis.
  In [3], a HA implementation was done using the list provided by a
  router associated ``HA_Chassis_Group``.

  However, this implementation requires Neutron to update the pinned
  chassis manually when a change in the HA_Chassis_Group happens; for
  example, when a ``Chassis`` is removed from the database. But if a
  node fails and the ``Chassis`` is not removed from the database, this
  HA implementation will fail.

  This bug proposes a more robust method that is not to pin the
  ``Logical_Router`` but to assign the ``HA_Chassis_Group`` to the GW
  LRP. That provides a more robust HA support as long as OVN checks the
  chassis interfaces, if one fails, it changes the GW LRP binding.

  [1]https://bugs.launchpad.net/neutron/+bug/2052821
  [2]https://review.opendev.org/c/openstack/neutron/+/909194
  [3]https://review.opendev.org/c/openstack/neutron/+/909437

  Jira reference: https://issues.redhat.com/browse/OSPRH-12265

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