Comment 41 for bug 1794991

Finally found the reason why it's not populating the fdb entries. In case where there are lots of ports, the gateway port binding gets skipped during reboot from the neutron server as per following code which relies on a timer to check which is not optimal:
https://github.com/openstack/neutron/blob/master/neutron/plugins/ml2/rpc.py#L332

I propose we come up with a more deterministic way of knowing whether the reboot completed either through RPC confirmation or the iteration counter.

For now a fix that works would be to increate the l2pop agent_boot_time from the default value of 180 to 1800 in my case in the neutron server ml2 config.