cucsSwEthLanBorderFsmTaskRn is the Relative Name (RN) of one queued task belonging to the FSM workflow that provisions a Cisco UCS LAN border domain (a cucsSwEthLanBorderFsmTask row) -- the naming fragment that distinguishes it from its sibling instances under the same parent object. UCS Manager builds the full DN by appending this RN to the parent's DN, so it is the piece an admin or script uses to tell this FSM task apart from others attached to the same parent. For instance, comparing the RN values under one parent quickly tells an admin which specific sibling -- among several instances of the same class -- this FSM task refers to.