The real DESCRIPTION field here is just the auto-generated stub "Cisco UCS fabric:FcVsanPortEp:switchId managed object property", so it carries no real prose -- but the property name and its CucsNetworkSwitchId type tell you what it holds: It holds which fabric interconnect (switch A or switch B) this VSAN port endpoint physically belongs to. Because a UCS domain is built around exactly two fabric interconnects for redundancy, this value tells an admin at a glance which half of the fabric this VSAN port endpoint lives on, which matters when diagnosing an outage that is affecting only one side of a dual-homed SAN connection. This VSAN port endpoint would report switchId 2 (B), placing it on fabric interconnect B.