Comment 3 for bug 1789686

Reviewed: https://review.openstack.org/592538
Committed: https://git.openstack.org/cgit/openstack/networking-ovn/commit/?id=c44d075269acb0b28ef3d68071ac3864911077d9
Submitter: Zuul
Branch: master

commit c44d075269acb0b28ef3d68071ac3864911077d9
Author: Daniel Alvarez <email address hidden>
Date: Wed Aug 29 15:58:05 2018 +0000

    Set/unset external MAC addresses for NAT entry when port is up/down

    When using distributed floating IPs, we set the external MAC
    address and logical port fields regardless whether the LSP
    is up. For the particular use of Octavia LB VIP, which doesn't
    ever get bound, the floating IP associated to it will never
    get the flows installed by ovn-controller.

    This patch changes the mechanism so that the DNAT entries get
    updated only on port up/down changes. If the port remains
    down, the external_mac will be cleared and traffic to those
    FIPs will still go through the centralized router.
    When a port gets bound to a chassis, if DVR is enabled, the
    mac_address field will be populated and traffic will go to
    the compute node.

    Closes-bug: #1789686
    Change-Id: I0043984b4bb7b3780112aba170ffb956c48084d0
    Signed-off-by: Daniel Alvarez <email address hidden>