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[Slawek Kaplonski <1942251@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1942251

Title:
  Routes has not added after router restart

Status in neutron:
  Fix Released

Bug description:
  Environment: openstack Train installed with kolla-ansible in multinode mode; there are two separated network nodes in the cluster. Router has configured with static routes on two network nodes in HA mode. Example:
  ```
  openstack router show -f json 18958d58-adf6-4998-a344-f74bc509b676
  {
    "admin_state_up": true,
    "availability_zone_hints": [],
    "availability_zones": [
      "nova"
    ],
    "created_at": "2021-08-31T09:59:57Z",
    "description": "",
    "distributed": false,
    "external_gateway_info": null,
    "flavor_id": null,
    "ha": true,
    "id": "18958d58-adf6-4998-a344-f74bc509b676",
    "interfaces_info": [
      {
        "port_id": "169839bc-39a9-4efa-b2b5-869ab45cbc33",
        "ip_address": "169.254.192.248",
        "subnet_id": "d78b2ac7-1fe5-4b70-a07e-c5044f7bfcda"
      },
      {
        "port_id": "396a8c07-bc0d-444a-8068-5434f3b8d9e9",
        "ip_address": "172.29.9.1",
        "subnet_id": "cefd937e-2811-469c-9c95-00ece7e17897"
      },
      {
        "port_id": "9716682b-174c-43e4-9b0f-48276c2c887c",
        "ip_address": "172.30.1.254",
        "subnet_id": "0e4c8974-d81b-492b-a40f-d0f7542784b9"
      },
      {
        "port_id": "de46c6f5-f6ca-4f14-8b21-2f771480c196",
        "ip_address": "169.254.195.165",
        "subnet_id": "d78b2ac7-1fe5-4b70-a07e-c5044f7bfcda"
      }
    ],
    "location": {
      "cloud": "",
      "region_name": "RegionPD9Over",
      "zone": null,
      "project": {
        "id": "954718a6deca4897afcd44dc7d2b3c8d",
        "name": "admin",
        "domain_id": null,
        "domain_name": "Default"
      }
    },
    "name": "test1_router",
    "project_id": "954718a6deca4897afcd44dc7d2b3c8d",
    "revision_number": 22,
    "routes": [
      {
        "destination": "172.178.178.0/24",
        "nexthop": "172.29.9.2"
      }
    ],
    "status": "ACTIVE",
    "tags": [],
    "updated_at": "2021-08-31T18:15:02Z"
  }
  ```
  Routes are not added automatically after router reenable or l3 agent restart.
  neutron-l3-agent.log:
  ```
  2021-08-31 13:59:11.097 747 DEBUG neutron.agent.l3.router_info [-] Added route entry is '{'destination': '172.178.178.0/24', 'nexthop': '172.29.9.2'}' routes_updated /usr/lib/python3/dist-packages/neutron/agent/l3/router_info.py:190
  2021-08-31 13:59:11.097 747 DEBUG neutron.agent.linux.utils [-] Running command: ['sudo', 'neutron-rootwrap', '/etc/neutron/rootwrap.conf', 'ip', 'netns', 'exec', 'qrouter-18958d58-adf6-4998-a344-f74bc509b676', 'ip', 'route', 'replace', 'to', '172.178.178.0/24', 'via', '172.29.9.2'] create_process /usr/lib/python3/dist-packages/neutron/agent/linux/utils.py:87
  2021-08-31 13:59:11.317 747 ERROR neutron.agent.linux.utils [-] Exit code: 2; Stdin: ; Stdout: ; Stderr: Error: Nexthop has invalid gateway.
  ```

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