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Openstack havanna neutron agent-list alive status error

In some scenarios, the openstack neutron-agent status will show as xxx even though you could see he neutron agents services are up and running in the network and compute nodes. Also you could see a fluctuation in the agent status if you try the agent-list command repeatedly.  Confusing, right?

Actually  the problem is not in the actual agent status, but with two default configurations in neutron.conf ie agent_down_time and report_interval. It is the interval during which neutron will check the agent status. There is a bug reported against this issue

https://bugs.launchpad.net/neutron/+bug/1293083

As per the details in the bug " report_interval" is how often an agent sends out a heartbeat to the service. The Neutron service responds to these 'report_state' RPC messages by updating the agent's heartbeat DB record. The last heartbeat is then compared to the configured agent_down_time to determine if the agent is up or down"

The neutron agent-list command uses the agent_down_time value to display the status. The default values are set very low, because of which the alive status is shown as down/fluctuating.

Solution: As suggested in the solution for the bug, update the values of agent_down_time and report_interval to 75 and 30 seconds respectively. Since the above mentioned rpc issue with open-vswitch agent in compute is  resolved by this, all the agents will be shown as alive
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