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[Brian Haley <1918914@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/1918914

Title:
  Toggling dhcp on and off in a subnet causes new instances to be
  unreachable

Status in neutron:
  Invalid

Bug description:
  After DHCP was turned on and off again on our network, new instances
  where not reachable. We found that they still tried to get their
  network config via DHCP after that.

  We run Openstack Ussuri installed with Openstack Kolla with OVN
  networking enabled. Also force_config_drive is set to true.

  Steps to reproduce:

    openstack network create test
    openstack subnet create --no-dhcp --subnet-range 192.168.0.0/24 --network test test
    openstack router create test
    openstack router set test --external-gateway public
    openstack router add subnet test test

    openstack server create --network test --image
  e83d66e7-776a-4b59-a583-97dfcc5799f6 --flavor s3.small --key-name
  noudssh test-1

  Network metadata:

  {
     "links" : [
        {
           "ethernet_mac_address" : "fa:16:3e:b1:f6:ee",
           "id" : "tap7608d5b5-bd",
           "mtu" : 8942,
           "type" : "ovs",
           "vif_id" : "7608d5b5-bdc5-4215-a39c-acd8fa1318c2"
        }
     ],
     "networks" : [
        {
           "id" : "network0",
           "ip_address" : "192.168.0.237",
           "link" : "tap7608d5b5-bd",
           "netmask" : "255.255.255.0",
           "network_id" : "66a6378c-3e2d-4814-9412-4a784a81e516",
           "routes" : [
              {
                 "gateway" : "192.168.0.1",
                 "netmask" : "0.0.0.0",
                 "network" : "0.0.0.0"
              }
           ],
           "services" : [],
           "type" : "ipv4"
        }
     ],
     "services" : []
  }

  Toggle DHCP and create new server:

    openstack subnet set --dhcp test
    openstack subnet set --no-dhcp test
    openstack server create --network test --image e83d66e7-776a-4b59-a583-97dfcc5799f6 --flavor s3.small --key-name noudssh test-2

  Network metadata:

  {
     "links" : [
        {
           "type" : "ovs",
           "id" : "tapee8f020a-1f",
           "vif_id" : "ee8f020a-1f2e-4db3-aab5-f6387fb45ba6",
           "ethernet_mac_address" : "fa:16:3e:94:05:35",
           "mtu" : 8942
        }
     ],
     "services" : [],
     "networks" : [
        {
           "network_id" : "66a6378c-3e2d-4814-9412-4a784a81e516",
           "link" : "tapee8f020a-1f",
           "type" : "ipv4_dhcp",
           "id" : "network0"
        }
     ]
  }

  As DHCP is now off, this instance stays unreachable.

  I tried the same in a cluster with OVN disabled and that worked
  without any problem. So this seems to be OVN related.

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