The real DESCRIPTION field here is just the auto-generated stub "Cisco UCS fabric:FcVsanPortEp:chassisId 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 associated with this VSAN port endpoint itself, mirroring peerChassisId but describing the local rather than the far side of the link. Since a single FC port endpoint that has been assigned to carry one specific VSAN's traffic, this VSAN port endpoint normally does not sit behind a chassis IOM at all, so this field typically reports 0 here just like its peer counterpart -- it exists on this object mainly because the class inherits a common set of physical-location fields shared with chassis-facing port objects elsewhere in the same MIB. Expect this to read 0 for a normal fabric-interconnect-hosted VSAN port endpoint, since it is not itself chassis-mounted hardware.