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[Rodolfo Alonso <2033887@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

The patch [1] is incorrectly handling the port binding of the subports.
This is a more complex operation than just updating the "PortBinding"
object. In order to change the port binding host ID, it is needed to
remove all "PortBinding" and "PortBindingLevels" registers and create
new ones pointing to the new host ID.

This patch is also breaking the cold migration process in ML2/OVN
environments with Trunk ports. The subports are not receiving the DHCP
information because OVN is not creating the DHCP flows that attend to
the DHCP requests. For example [2].

The recommended action is to revert the mentioned patch.

[1]https://review.opendev.org/c/openstack/neutron/+/882581
[2]https://paste.opendev.org/show/bVnaVLVP9fkrm0QlXtYc/

** Affects: neutron
     Importance: High
     Assignee: Rodolfo Alonso (rodolfo-alonso-hernandez)
         Status: In Progress

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

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

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https://bugs.launchpad.net/bugs/2033887

Title:
  [OVN][Trunk] The cold migration process is broken since patch 882581

Status in neutron:
  In Progress

Bug description:
  The patch [1] is incorrectly handling the port binding of the
  subports. This is a more complex operation than just updating the
  "PortBinding" object. In order to change the port binding host ID, it
  is needed to remove all "PortBinding" and "PortBindingLevels"
  registers and create new ones pointing to the new host ID.

  This patch is also breaking the cold migration process in ML2/OVN
  environments with Trunk ports. The subports are not receiving the DHCP
  information because OVN is not creating the DHCP flows that attend to
  the DHCP requests. For example [2].

  The recommended action is to revert the mentioned patch.

  [1]https://review.opendev.org/c/openstack/neutron/+/882581
  [2]https://paste.opendev.org/show/bVnaVLVP9fkrm0QlXtYc/

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