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[OpenStack Infra <1956476@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/c/openstack/neutron/+/823568
Committed: https://opendev.org/openstack/neutron/commit/55afd9bc923f55bc8f621316a080ad4271182ebc
Submitter: "Zuul (22348)"
Branch:    master

commit 55afd9bc923f55bc8f621316a080ad4271182ebc
Author: Rodolfo Alonso Hernandez <ralonsoh@xxxxxxxxxx>
Date:   Thu Dec 23 11:00:09 2021 +0000

    [OVN] Allow only one physical network per bridge
    
    Same as in other ML2 plugins (OVS, Linux Bridge), OVN mechanism driver
    should allow only one physical network per bridge. The rule "one
    network, one bridge" should be present in OVN too.
    
    By allowing only one physical network per bridge, Neutron prevents
    having two networks with subnets with the same CIDR in the same bridge.
    Currently is possible and this CIDR clash is not prevented (shouldn't be
    by the API). This architectural limitation prevents this situation.
    
    This limitation is already present in deployment tools as TripleO.
    
    Closes-Bug: #1956476
    Change-Id: I74a2ca9a344a93219deb94d60247478ee3200659


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

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https://bugs.launchpad.net/bugs/1956476

Title:
  [OVN] Disallow multiple physnets per bridge

Status in neutron:
  Fix Released

Bug description:
  Related bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1993681

  Patch [1] allowed to have multiple physical networks per bridge.
  Although this could be feasible in OVN, the ML2 OVN mechanism driver
  should not allow it. The OVN mech driver should have the same
  behaviour as OVS or LB.

  In the related bugzilla there are some steps to reproduce a configuration that leads to a subnet CIDR range conflict, when both networks are in the same bridge, that is not prohibited by Neutron. Steps to Reproduce:
  1. Create two physical networks mapped to the same physical network
  2. Enable both two physical networks as flat network providers
  3. Create a flat network and a subnet with range 10.0.0.0/24 on the first physical network
  3. Create another flat network and a subnet with range 10.0.0.0/24 on the second physical network

  [1]https://github.com/openstack/networking-
  ovn/commit/a4781fd0f9c59603638b41069a175547a24c4b1c

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