The real DESCRIPTION field here is just the auto-generated stub "Cisco UCS fabric:FcSanPcEp:epDn 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 dn of the physical port endpoint object underlying this FC SAN port-channel member port, linking the logical port-channel or profile row back to the actual hardware port it rides on. Because one individual physical FC uplink that has been added as a member link into a larger FC SAN port-channel bundle, this field is how UCS Manager ties this logical object back to one concrete piece of hardware -- so an admin following a fault or a cable pull can jump straight from this FC SAN port-channel member port to the exact physical port responsible. A value here might look like sys/switch-B/fc-slot-3/fc-13, pointing at the specific physical uplink that backs this FC SAN port-channel member port.