The real DESCRIPTION field here is just the auto-generated stub "Cisco UCS fabric:FcSanEp:peerChassisId managed object property", so it carries no real prose -- but the property name and its Gauge32 type tell you what it holds: It holds the chassis identifier of whatever sits on the far end of this FC SAN uplink port's physical connection, when that far end is a chassis IOM rather than another switch. On the upstream Fibre Channel SAN switch port (an MDS or Nexus) it is cabled to, this is not really applicable, so this field typically reports 0 for this FC SAN uplink port -- a nonzero value here would actually be a sign this port is unexpectedly wired to a blade chassis instead of the SAN. Expect this to read 0 for a normal SAN-facing FC SAN uplink port; a nonzero value such as 2 would flag a wiring mistake worth investigating.