The MIB's DESCRIPTION for cucsLicenseTargetAggrPortId is only the auto-generated stub 'Cisco UCS license:Target:aggrPortId managed object property', but the 'aggrPortId' property name together with its Gauge32 type tell us this column, on the specific hardware target (a port, slot, or rack unit) that a port- or unit-based license applies to, holds the aggrPortId as UCS Manager's data model defines it, exposed here as a read-only SNMP value (read-only). The aggrPortId identifies the aggregate (breakout) port number when this license target refers to a sub-port of a breakout cable rather than a whole physical port, since some fabric-interconnect ports split into multiple licensable sub-ports. A 40G port broken out into four 10G sub-ports would use aggrPortId to distinguish which of those four sub-ports this specific license target covers.