We found during our testing that when ever there is a reboot of the ODL, some of the neutron port interface state was not available for the other services(L3VPN).

below is the analysis of the problem.

We root-caused the problem to parentRef not set in Interface-Config DS for the port 794e9449-933c-4412-8b88-c27e2b2ec8f7.

Because parentRef is not set, interfaceState was not created for 794e9449-933c-4412-8b88-c27e2b2ec8f7, which resulted in that interface not being processed by both ELAN and L3VPN.

When I analyzed further why parentRef is not set, it looked to me that an update() call in NeutronPortChangeListener never got fired . However, from the log files we noticed two add() invocations in the NeutronPortChangeListener which is tagged to Neutron-Port entity of Config DS.