[Bug 1892405] Re: Removing router interface causes router to stop routing between all

[Corey Bryant]

This patch has landed in upstream master and backports have been
proposed for stable/ussuri and stable/victoria upstream.

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

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

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

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

** Changed in: neutron (Ubuntu Focal)
       Status: New => Triaged

** Changed in: neutron (Ubuntu Focal)
   Importance: Undecided => High

** Changed in: neutron (Ubuntu Hirsute)
   Importance: Undecided => High

** Changed in: neutron (Ubuntu Groovy)
       Status: New => Triaged

** Changed in: neutron (Ubuntu Groovy)
   Importance: Undecided => High

** Changed in: neutron (Ubuntu Hirsute)
       Status: New => Triaged

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

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

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

** Changed in: cloud-archive/ussuri
       Status: New => Triaged

** Changed in: cloud-archive/victoria
       Status: New => Triaged

** Changed in: cloud-archive/ussuri
   Importance: Undecided => High

** Changed in: cloud-archive/victoria
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1892405

Title:
  Removing router interface causes router to stop routing between all

Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive ussuri series:
  Triaged
Status in Ubuntu Cloud Archive victoria series:
  Triaged
Status in neutron:
  In Progress
Status in neutron package in Ubuntu:
  Triaged
Status in neutron source package in Focal:
  Triaged
Status in neutron source package in Groovy:
  Triaged
Status in neutron source package in Hirsute:
  Triaged

Bug description:
  [Impact]
  Stumbled upon an issue where removing a DVR HA router interface renders all other subnets connected to that router to stop routing. VMs can't reach the HA port (IP) of the router (ping).

  Worked around this by:
  openstack router set --disabled <ROUTER>
  openstack router set --enable <ROUTER>

  This has happened more than once in the current deployment
   - cloud:bionic-stein
   - neutron 2:14.0.4-0ubuntu1~cloud1

  [Test Case]
  TBD

  [Where problems could occur]
  TBD

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