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[OpenStack Infra <2071818@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/c/openstack/neutron/+/923391
Committed: https://opendev.org/openstack/neutron/commit/f651b28c4234ab7d20ecae7d12b47cc090b92ea9
Submitter: "Zuul (22348)"
Branch:    master

commit f651b28c4234ab7d20ecae7d12b47cc090b92ea9
Author: Lucas Alvares Gomes <lucasagomes@xxxxxxxxx>
Date:   Wed Jul 3 13:39:18 2024 +0100

    [OVN] Add support for broadcast_arps_to_all_routers
    
    This patch introduces a new configuration option for OVN called
    "broadcast_arps_to_all_routers". This option is responsible for
    configuring the external networks with the 'broadcast-arps-to-all-routers'
    configuration from OVN 23.06 and newer. By enabling this option (default)
    OVN will flood ARP requests to all attached ports on a network. If
    disabled, ARP requests are only sent to routers on that network if the
    target MAC address matches. ARP requests that does not match a router
    will only be forwarded to non-router ports.
    
    Closes-Bug: #2071818
    Change-Id: Id16b16113420e9f024e1936f9427824d711b6d30
    Signed-off-by: Lucas Alvares Gomes <lucasagomes@xxxxxxxxx>


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

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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:
  Fix Released

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 realized that
  configuring this option was not possible via ML2/OVN so this bug is
  being opened to track this work.

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