Comment 3 for bug 1641879

I am still working on analysis of this bug, but it seems to be easily reproducable and does not seem to be (directly) related to persistent storage being wiped. I currently have the following scenario:

1. Boot the network node (failover node)
2. Notice the following in /var/log/neutron/l3-agent.log

ERROR oslo_service.periodic_task [req-8b6c1048-1a4a-484c-bdf6-e069f478a144 - - - - -] Error during L3NATAgentWithStateReport.periodic_sync_routers_task

3. Fix the problem by removing the router from the l3-agent

$ neutron l3-agent-router-remove <agent id> <router id>

4. Notice the following lines in /var/log/neutron/l3-agent.log

WARNING neutron.agent.l3.agent [-] Info for router a94b7f00-36ba-4944-bc48-025473758224 was not found. Performing router cleanup
INFO neutron.agent.l3.ha [-] Router a94b7f00-36ba-4944-bc48-025473758224 transitioned to backup

6. The system now performs as expected
5. Now, stop the l3-agent

# systemctl stop neutron-l3-agent

6. Start the l3-agent

# systemctl start neutron-l3-agent

7. Notice the same error as (2) re-appears