Comment 0 for bug 1983530

I have en environment, with 5 neutron-server(W version), 5 ovn(21.03.1)

When adding an interface to the router, the state of the interface is sometimes down,
and it will not become up after a long time. Restarting the neutron server can become up.

I check logical_switch_port by "ovn-nbctl list logical_switch_port <port-id>", the status
of lsp is up, and the traffic can be forwarded normally.

This should only be a neutron save state problem.

In the past, when creating vm, the ports have been unable to be up, and the reason has not
been found. The phenomenon is the same as that of the router interface.

In the process of adding a routing interface, I wrote a script to listen to logical_switch_port
change, I found: before lsp becomes up=true, lsp's up=[], which is not up=[false], not matchd
LogicalSwitchPortUpdateUpEvent. I don't know why ovn's notification events are sometimes different,
but I think it should be repaired here in neutron