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[Brian Haley <1683256@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: In Progress => Won't Fix

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https://bugs.launchpad.net/bugs/1683256

Title:
  linuxbridge multinode depending on multicast support of provider

Status in neutron:
  Won't Fix

Bug description:
  The way the Linux Bridge multinode job works right now, the VXLAN
  tenant networks are not using l2_population and subsequently rely on
  the multicast 'group' feature of kernel bridges for carrying broadcast
  traffic.

  This would not normally be a problem, however, the local interface
  they are using to send this multicast traffic is the one attached
  directly to the provider cloud's network. So we are ultimately at the
  mercy of the provider's networks to carry multicast traffic between
  the multi-node instances, which is just asking for failures.

  We need to adjust the job to setup a tunnel between the multinode
  instances to safely carry traffic between them like we do for DVR [1].

  1. https://git.openstack.org/cgit/openstack-infra/devstack-
  gate/tree/devstack-vm-gate.sh#n149

  This is likely leading to the instability of the LB multi-node job
  when the job is on certain cloud providers that might not have good
  multicast routing.

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