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[Edward Hope-Morley <1894843@xxxxxxxxxxxxxxxxxx>]

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

** Also affects: cloud-archive
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/ussuri
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/victoria
   Importance: Undecided
       Status: New

** Also affects: neutron (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: neutron (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: neutron (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Also affects: neutron (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1894843

Title:
  [dvr_snat] Router update deletes rfp interface from qrouter even when
  VM port is present on this host

Status in Ubuntu Cloud Archive:
  New
Status in Ubuntu Cloud Archive ussuri series:
  New
Status in Ubuntu Cloud Archive victoria series:
  New
Status in neutron:
  Fix Released
Status in neutron package in Ubuntu:
  New
Status in neutron source package in Focal:
  New
Status in neutron source package in Groovy:
  New
Status in neutron source package in Hirsute:
  New

Bug description:
  Hello,

  In the case of dvr_snat l3 agents are deployed on hypervisors there
  can be race condition. The agent creates snat namespaces on each
  scheduled host and removes them at second step. At this second step
  agent removes the rfp interface from qrouter even when there is VM
  with floating IP on the host.

  When VM is deployed at the time of second step we can lost external
  access to VMs floating IP. The issue can be reproduced by hand:

  1. Create tenant network and router with external gateway
  2. Create VM with floating ip
  3. Ensure that VM on the hypervisor without snat-* namespace
  4. Set the router to disabled state (openstack router set --disable <router>)
  5. Set the router to enabled state (openstack router set --enabled <router>)
  6. The external access to VMs FIP have lost because L3 agent creates the qrouter namespace without rfp interface.

  
  Environment:

  1. Neutron with ML2 OVS plugin.
  2. L3 agents in dvr_snat mode on each hypervisor
  3. openstack-neutron-common-15.1.1-0.20200611111910.7d97420.el8ost.noarch

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