Comment 3 for bug 1439824

Reviewed: https://review.openstack.org/156360
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=54c05b500ac3ffad98cb480dc5bfd04bdcf91229
Submitter: Jenkins
Branch: master

commit 54c05b500ac3ffad98cb480dc5bfd04bdcf91229
Author: Andrew Boik <email address hidden>
Date: Mon Mar 23 11:21:11 2015 -0400

    Support multiple IPv6 prefixes on internal router ports

    (Patch set #3 for the multiple-ipv6-prefixes blueprint)

    Provides support for adding multiple IPv6 subnets to an internal router
    port. The limitation of one IPv4 subnet per internal router port
    remains, though a port may contain one IPv4 subnet with any number of
    IPv6 subnets.

    This changes the behavior of both the router-interface-add and
    router-interface-delete APIs. When router-interface-add is called with
    an IPv6 subnet, the subnet will be added to an existing internal port
    on the router with the same network ID if the existing port already has
    one or more IPv6 subnets. Otherwise, a new port will be created on the
    router for that subnet. When calling the router-interface-add with a
    port (one that has already been created using the port-create command),
    that port will be added to the router if it meets the following
    conditions:

            1. The port has no more than one IPv4 subnet.
            2. If the port has any IPv6 subnets, it must not have the same
               network ID as an existing port on the router if the existing
               port has any IPv6 subnets.

    If the router-interface-delete command is called with a subnet, that
    subnet will be removed from the router port to which it belongs. If the
    subnet is the last subnet on a port, the port itself will be deleted
    from the router. If the router-interface-delete command is called with
    a port, that port will be deleted from the router.

    This change also allows the RADVD configuration to support advertising
    multiple prefixes on a single router interface.

    DocImpact

    Change-Id: I7d4e8194815e626f1cfa267f77a3f2475fdfa3d1
    Closes-Bug: #1439824
    Partially-implements: blueprint multiple-ipv6-prefixes