This is the Relative Name (Rn) — the naming fragment that this VSAN's endpoint on an FCoE member port contributes to its own Dn, appended to its parent object's Dn. An admin or script that already has the parent's Dn (say, the fabric interconnect or the containing LAN Cloud) concatenates this Rn onto it to build the full path to this VSAN's endpoint on an FCoE member port without needing to know the whole tree in advance. For an object of this type the Rn is usually a short token derived from its class and key fields, e.g. something like 'fcoeVsanPortEp' combined with an id or name suffix.