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

[Brian Murray]

This bug is missing a completed SRU template in its description but
looking at the upload I see that there is a test for this change so I'm
accepting the upload. However, please fill out the bug description with
SRU information.

** Changed in: ovn (Ubuntu Hirsute)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-hirsute

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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:
  Incomplete
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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