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[Expired for neutron because there has been no activity for 60 days.]

** Changed in: neutron
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/2067571

Title:
  The outbound unicast traffic of VMS with security group enabled is
  broadcast

Status in neutron:
  Expired

Bug description:
  I encountered using openstack Security Group,If security groups are
  enabled for virtual nics on cloud hosts, The outgoing traffic of the
  VMS enabled in the security group should be unicast traffic, but it is
  eventually forwarded to all ports belong to the vlan on the ovs br-int
  bridge.

    The following is my debugging process in detail.
    The unicast packet sent by the remote virtual machine 172.83.160.63 to the local virtual machine 172.83.160.74 is passed to the br-ex->br-int-> VM,
    Because the security group is enabled on the VM NIC, The br-int cannot learn the entry whose port is patch-ex and mac address is vm2.
    Therefore those packets sent from vm1 to vm2 are broadcast in vlans because they fail to match mac address entries.

                            patch-int
       vm1 --- ovs(br-int) ------ ovs(br-ex)--- tor(physical switch) ......vm2
                     patch-ex

    The following is the ovs kernel flow table. The mac address of vm1 is fa:16:3e:6c:f3:09,The mac address of vm2 is fa:16:3e:d2:14:b5, the action of the flow table is multiple ports.
    recirc_id(0x314123),in_port(8),ct_state(-new+est-rel-rpl),eth(src=fa:16:3e:d2:14:b5,dst=fa:16:3e:6c:f3:09),eth_type(0x0800),ipv4(proto=6,frag=no),tcp(dst=2048/0xf800), packets:60100, bytes:14257193, used:2.035s, flags:P., actions:push_vlan(vid=5,pcp=0),3,pop_vlan,push_vlan(vid=1732,pcp=0),1,pop_vlan,7,9,10,15,5,18
       recirc_id(0x314123),in_port(8),ct_state(-new+est-rel+rpl-inv+trk),ct_zone(0x5),ct_mark(0),eth(src=fa:16:3e:d2:14:b5,dst=fa:16:3e:6c:f3:09),eth_type(0x0800),ipv4(frag=no), packets:1, bytes:54, used:2.037s, flags:., actions:push_vlan(vid=5,pcp=0),3,pop_vlan,push_vlan(vid=1732,pcp=0),1,pop_vlan,7,9,10,15,5,18

       After careful debugging analysis, the openflow action in the flow table 82 added by neutron is the VM port instead of normal.
    As a result, the ovs br-int bridge cannot learn the mac entry of vm2.

    table=82, priority=77,ct_state=+new-est,tcp,reg5=0x9,tp_dst=0x4/0xfffc actions=ct(commit,zone=NXM_NX_REG6[0..15]),output:9
       table=82, priority=77,ct_state=+est-rel-rpl,tcp,reg5=0x9,tp_dst=0x4/0xfffc actions=output:9

  thank you

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