Loop Remover only works 1 time after controller starts

Loop remover only works first time you bring mininet after controller starts, second and sucesive times does not work.

To reproduce:

1) Start controller

2) Start mininet in ring or regular topology like linear

3) Check port inventory and see loopremover working:

<node-connector>
<id>openflow:1:2</id>
<status xmlns="urn:opendaylight:l2switch:loopremover">forwarding</status>

4) Stop mininet

5) Start mininet again (same topology used in 2)

6) Check port inventory, now there is no loopremover in any port

7) In case of ring topology this will cause packet loop

BR/Luis