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[Eugene Nikanorov <enikanorov@xxxxxxxxxxxx>]

This is expected behavior.
Node time being in sync with other nodes and not being adjusted severily is critical for agent status to work properly.


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

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https://bugs.launchpad.net/bugs/1579631

Title:
  Node time changed，resulting in abnormal state of neutron agent.

Status in neutron:
  Invalid

Bug description:
  Bug performance
  1）compute node without L3 agent and DHCP agent，But in the control node can see the compute node’s L3 agent and DHCP agent work normally

  
  [root@controller ~(keystone_admin)]# neutron agent-list|grep Slot12
  | 2e15ea73-7abf-445c-a033-2bb94983c09a | PCI NIC Switch agent | SBCRRack3Shelf1Slot12 | :-)   | True           | neutron-pci-sriov-nic-agent |
  | 3ec4e476-bf1c-4a1c-baf7-2b6429389410 | Metadata agent       | SBCRRack3Shelf1Slot12 | :-)   | True           | neutron-metadata-agent      |
  | b769ecdf-4319-430e-b3af-bfb4e2d20f53 | L3 agent             | SBCRRack3Shelf1Slot12 | :-)   | True           | neutron-l3-agent            |
  | d2254fa9-db33-4277-9853-3dfe7ef9c643 | Open vSwitch agent   | SBCRRack3Shelf1Slot12 | :-)   | True           | neutron-openvswitch-agent   |
  | d639783e-0ff3-4777-9ce2-2c85512637f0 | DHCP agent           | SBCRRack3Shelf1Slot12 | :-)   | True           | neutron-dhcp-agent          |
  [root@SBCRRack3Shelf1Slot11 ~(keystone_admin)]# 

  
  [root@compute ~(keystone_admin)]# neutron agent-show b769ecdf-4319-430e-b3af-bfb4e2d20f53
  +---------------------+-------------------------------------------------------------------------------+
  | Field               | Value                                                                         |
  +---------------------+-------------------------------------------------------------------------------+
  | admin_state_up      | True                                                                          |
  | agent_type          | L3 agent                                                                      |
  | alive               | True                                                                          |
  | binary              | neutron-l3-agent                                                              |
  | configurations      | {                                                                             |
  |                     |      "router_id": "",                                                         |
  |                     |      "agent_mode": "legacy",                                                  |
  |                     |      "gateway_external_network_id": "",                                       |
  |                     |      "handle_internal_only_routers": true,                                    |
  |                     |      "use_namespaces": true,                                                  |
  |                     |      "routers": 0,                                                            |
  |                     |      "interfaces": 0,                                                         |
  |                     |      "floating_ips": 0,                                                       |
  |                     |      "interface_driver": "neutron.agent.linux.interface.OVSInterfaceDriver",  |
  |                     |      "external_network_bridge": "br-ex",                                      |
  |                     |      "ex_gw_ports": 0                                                         |
  |                     | }                                                                             |
  | created_at          | 2016-04-08 05:55:31                                                           |
  | description         |                                                                               |
  | heartbeat_timestamp | 2016-04-14 02:29:38                                                           |
  | host                | SBCRRack3Shelf1Slot12                                                         |
  | id                  | b769ecdf-4319-430e-b3af-bfb4e2d20f53                                          |
  | started_at          | 2016-04-13 09:42:49                                                           |
  | topic               | l3_agent                                                                      |
  +---------------------+-------------------------------------------------------------------------------+
  [root@SBCRRack3Shelf1Slot11 ~(keystone_admin)]#

  Bug reason
  2）After check，the agent is down,so heartbeat_timestamp is not updated.
    However,for some reason,the controller node's current time changed(Earlier than heartbeat_timestamp) ,The controller node 's current time minus the agent' s heartbeat_timestamp negative,So the controlerr node executing “ neutron agent-list” command, we can see the aegnt status is  :-)

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