The real DESCRIPTION field here is just the auto-generated stub "Cisco UCS fabric:FcVsanPortEp:rn managed object property", so it carries no real prose -- but the property name and its SnmpAdminString type tell you what it holds: It holds the rn (relative name) of this VSAN port endpoint -- just the last naming segment of its dn, i.e. how this object is named directly under its parent container. This is the piece of the address that is unique to this one VSAN port endpoint among its siblings under the same parent (for instance among all the members of the same port-channel, or all zones in the same profile), so it is what actually differentiates this row from the next one in the table. A typical value here might look like "fcvsanportep-94", the short local name UCS Manager appends onto the parent's dn to build this object's full path.