Topology is not learned after controller restart

These are the steps to reproduce:

1) Start controller with default openflow feature (I do not see the issue with Li redesign code):

feature:install odl-openflowplugin-flow-services-ui

2) Start mininet any topology (i.e. tree,2)

3) Stop controller, you can do proper shutdown (bin/stop) or shut abruptly (kill java)

4) Start controller again (bin/karaf, bin/start)

5) Pull topology with REST and check for links:

GET http://localhost:8181/restconf/operational/network-topology:network-topology/

You will need to repeat 3-5 steps more than once if you do not see all links missing but I saw the issue very clear after retrying a few times.

Additional information:

• There is no logging in karaf.log indicating a fault situation, this is same logging is seen when it works and when it does not.

• Using wireshark when the issue pops up, I can see no LLDP packet-out from controller down to the switches.

BR/Luis