This object identifies the RPL port of the ring. Valid values for this object are '0', 'IfIndex of fsErpsRingPort1' and 'IfIndex of fsErpsRingPort2'. When a port is configured as a RPL port, that node becomes RPL owner for that ring. Value '0' indicates that none of the ring ports is a RPL port and hence the node is not a RPL owner. In an interconnected node of a sub-ring, the 'fsErpsRingPort1' alone can be chosen as an RPL port when administrator decides to have the interconnected node as the RPL Owner of the sub-ring. Administrator has to ensure that, only one node in a ring is configured as RPL owner.