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[Harald Jensås <harald.jensas@xxxxxxxxx>]

Public bug reported:

The following code in neutron/agent/linux/dhcp.py will create on-link
/link-local routes to all subnets in a network.

 host_routes.extend(["%s,0.0.0.0" % (s.cidr) for s in
                                    self.network.subnets
                                    if (s.ip_version == 4 and
                                        s.cidr != subnet.cidr)])

White the introduction of Neutron segments, this needs to be update so
that host_routes for on-link destinations are only created if
l2-adjacency is True.

We should also create host_routes for all subnets whithin the same
segment, as I understand it l2-adjacency is guaranteed within each
segment. And Segment can have multiple Subnets.


ref: http://specs.openstack.org/openstack/neutron-specs/specs/newton/routed-networks.html

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1669594

Title:
  DHCP host_routes should be Neutron Segment aware

Status in neutron:
  New

Bug description:
  The following code in neutron/agent/linux/dhcp.py will create on-link
  /link-local routes to all subnets in a network.

   host_routes.extend(["%s,0.0.0.0" % (s.cidr) for s in
                                      self.network.subnets
                                      if (s.ip_version == 4 and
                                          s.cidr != subnet.cidr)])

  White the introduction of Neutron segments, this needs to be update so
  that host_routes for on-link destinations are only created if
  l2-adjacency is True.

  We should also create host_routes for all subnets whithin the same
  segment, as I understand it l2-adjacency is guaranteed within each
  segment. And Segment can have multiple Subnets.

  
  ref: http://specs.openstack.org/openstack/neutron-specs/specs/newton/routed-networks.html

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