The MIB's DESCRIPTION for cucsLicenseInstanceDefQuant is only the auto-generated stub 'Cisco UCS license:Instance:defQuant managed object property', but the 'defQuant' property name together with its Gauge32 type tell us this column, on a specific licensed-feature grant on a fabric interconnect (a feature name plus a quantity), holds the defQuant as UCS Manager's data model defines it, exposed here as a read-only SNMP value (read-only). The defQuant is the default/baseline quantity of this licensed feature that ships included with the hardware before any additional license files are applied — the free allotment, as distinct from what's been separately purchased. A fabric interconnect model that includes a handful of ports pre-activated out of the box would show that count here even with zero extra license files installed.