RPL -(ring protection link is a ring link that under normal conditions, i.e, without any failure or request, is blocked (at one or both ends) for traffic channel, to prevent the information of loops). rplNone (1) - not RPL owner / neighbor rplOwner (2) - RPL owner is an ethernet ring node adjacent to the RPL that is responsible for blocking its end of the RPL under normal conditions (i.e the ring is established and no requests are present in the ring) rplNeighbor (3) - RPL neighbor is an ethernet ring node adjacent to the RPL that is responsible for blocking its end of the RPL under normal conditions in addition to the block by the RPL owner node. However, it is not responsible for activating the reversion behavior.