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[OpenStack Infra <1784590@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/608302
Committed: https://git.openstack.org/cgit/openstack/neutron-dynamic-routing/commit/?id=fc2dae7c93eb8606bcf0c77b6691595f69502c20
Submitter: Zuul
Branch:    master

commit fc2dae7c93eb8606bcf0c77b6691595f69502c20
Author: Ryan Tidwell <rtidwell@xxxxxxxx>
Date:   Fri Oct 5 10:45:38 2018 -0500

    Enable MP-BGP capabilities in Ryu BGP driver
    
    This change enables all capabilties regardless of peer address
    family, thereby enabling announcement of IPv6 prefixes over IPv4
    sessions and vice-versa. Peers can opt in/out with capabilities
    configured on the remote end of the session.
    
    Change-Id: I7b241cdfddcecbdd8cdde2e88de35b9be6982451
    Closes-Bug: #1784590


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

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https://bugs.launchpad.net/bugs/1784590

Title:
  neutron-dynamic-routing bgp agent should have options for MP-BGP

Status in neutron:
  Fix Released

Bug description:
  neutron-dynamic-routing

  The implementation of BGP with Ryu supports IPv4 and IPv6 peers but
  the MP-BGP capabilities is announced based on if the peer is a v4 or
  v6 address.

  If you want to use a IPv4 peer but announce IPv6 prefixes this will
  not work because in services/bgp/agent/driver/ryu/driver.py in the
  function add_bgp_peer() it disables the IPv6 MP-BGP capability if the
  peer IP is a IPv4 address.

  This should be extended to support setting the capabilities manually,
  if you change the enable_ipv6 variable in the add_bgp_peer() function
  to True it will correctly announce IPv6 prefixes over the IPv4 BGP
  peer if the upstream router (the other side) supports the MP-BGP IPv6
  capability.

  Should be easy to implement with a "mode" config option that can be
  set to auto or manual and then options to override the capabilities.

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