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[Lucas Alvares Gomes <2071818@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Reported at: https://bugzilla.redhat.com/show_bug.cgi?id=2294876

This is a limitation in core OVN that has been discussed in the past at
https://mail.openvswitch.org/pipermail/ovs-
discuss/2020-September/050716.html

What happens is that when there are too many ports with the "unknown"
address (a.k.a port security off) ARPS will be broadcasted up to the
point where it will hit this limitation in core OVN.

In OVN 23.06 and above, a new configuration option called "broadcast-
arps-to-all-routers" was introduced by core OVN to avoid this flooding
when disabled (when set to "false" at Logical_switch.other_config
column).

Recently one customer has hit this limitation and we released that
configuring this option is not possible via ML2/OVN so this bug is being
opened to track this work.

** Affects: neutron
     Importance: High
     Assignee: Lucas Alvares Gomes (lucasagomes)
         Status: In Progress


** Tags: ovn

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https://bugs.launchpad.net/bugs/2071818

Title:
  "over 4096 resubmit actions" error occurs when there are ~250 neutron
  routers on a provider network

Status in neutron:
  In Progress

Bug description:
  Reported at: https://bugzilla.redhat.com/show_bug.cgi?id=2294876

  This is a limitation in core OVN that has been discussed in the past
  at https://mail.openvswitch.org/pipermail/ovs-
  discuss/2020-September/050716.html

  What happens is that when there are too many ports with the "unknown"
  address (a.k.a port security off) ARPS will be broadcasted up to the
  point where it will hit this limitation in core OVN.

  In OVN 23.06 and above, a new configuration option called "broadcast-
  arps-to-all-routers" was introduced by core OVN to avoid this flooding
  when disabled (when set to "false" at Logical_switch.other_config
  column).

  Recently one customer has hit this limitation and we released that
  configuring this option is not possible via ML2/OVN so this bug is
  being opened to track this work.

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