This read-only bitmap reports the port members that are actually aggregated and actively participating in traffic forwarding for a given static link aggregation (LAG) group. Admins use it as the real-time view of a LAG's active membership, in contrast to the merely configured set of ports. For example, if a LAG group configured with two ports shows only one port in this aggregated-ports value, that tells an admin the other configured port has dropped out of the bundle, likely due to a link failure, which is exactly the condition the module's own me1200AggrNotificationChange trap is designed to report.