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[OpenStack Infra <1982367@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/c/openstack/neutron/+/850529
Committed: https://opendev.org/openstack/neutron/commit/06ddcaf4368ce054a8d396e70880f7dd1abe0562
Submitter: "Zuul (22348)"
Branch:    master

commit 06ddcaf4368ce054a8d396e70880f7dd1abe0562
Author: Slawek Kaplonski <skaplons@xxxxxxxxxx>
Date:   Wed Jul 20 16:18:27 2022 +0200

    Port update will trigger less notifications to the DHCP agents
    
    After port update, DHCP agent will be notified about changes only if
    one of the port's attributes related somehow to the DHCP will change.
    Such fields are:
    * fixed_ips,
    * MAC address,
    * dns_domain,
    * dns_name,
    * dns_assignment,
    * extra_dhcp_opts.
    
    In other cases there is no reason to send notifications to the agent.
    This will results with less notifications to the DHCP agent and less
    possibilities to race condition between DHCP and L2 agents while
    switching ports from the DOWN to ACTIVE status and sending notifications
    to nova.
    
    Closes-Bug: #1982367
    Change-Id: If7990bdec435af76ad2e88fd4ea2bc24a255fd5a


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1982367

Title:
  Race condition between DHCP and L2 agent during evacuate vms may cause
  VM ends up in ERROR state

Status in neutron:
  Fix Released

Bug description:
  During the evacuation of vm from the down compute node, it may happen
  that when port will be DOWN, DHCP agent will update port and send info
  to the neutron server before L2 (ovs) agent on the new compute node
  will do it. Because of that when L2 agent will report port is UP on
  the node, notification to nova will not be send as port status was
  already ACTIVE (changed when DHCP agent sent it's info that port is
  configured). Finally VM will end up in ERROR state as nova-compute
  will timeout while waiting for the notification from neutron.

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