[Bug 1943266] Re: Duplicated ARP responses from ovnmetadata namespaces

[Erlon R. Cruz]

Test for Focal on proposed branch passed

Console: https://gist.github.com/sombrafam/856f4245b6bf2b9672751a1e2cbe803d
Compute 1: https://gist.github.com/sombrafam/78d12ff153256f4fda7b0d7b243871b1
Compute 2: https://gist.github.com/sombrafam/009414aad781c66521abf4ce7cdd7f42

** Tags removed: verification-needed verification-needed-focal
** Tags added: verification-done verification-done-focal

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https://bugs.launchpad.net/bugs/1943266

Title:
  Duplicated ARP responses from ovnmetadata namespaces

Status in networking-ovn:
  Invalid
Status in ovn package in Ubuntu:
  Fix Released
Status in ovn source package in Focal:
  Fix Committed
Status in ovn source package in Hirsute:
  Fix Committed
Status in ovn source package in Impish:
  Fix Released

Bug description:
  When OpenStack instances are connected to an external network, an ovn-etadata-namespace is created in each compute that has VMs attached to that
  network. Because the ovn-metadata namespace has interfaces with the same mac address in all computers, external switches might ARP query for the IP
   and receive multiple responses in different ports triggering network error alerts.

  [ubuntu at sombrafam-bastion(kvm):~/internal_git/stsstack-bundles/openstack]$ sudo arping -c 1 10.5.150.0
  ARPING 10.5.150.0
  42 bytes from fa:16:3e:d3:10:01 (10.5.150.0): index=0 time=1.678 msec
  42 bytes from fa:16:3e:d3:10:01 (10.5.150.0): index=1 time=2.143 msec

  --- 10.5.150.0 statistics ---
  1 packets transmitted, 2 packets received,   0% unanswered (1 extra)
  rtt min/avg/max/std-dev = 1.678/1.911/2.143/0.232 ms


  Reproducer: https://paste.ubuntu.com/p/nbnhvTM9d4/

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