This object gives the Flow Reduction Sequence Number (FRSN) associated with the most recent Topology Database Update for this network node, unique only within that APPN network. Admins and management tools use FRSN values to detect and order topology updates, determining when a node's topology information was last refreshed at the agent. For example, comparing this FRSN across polling cycles lets an admin tell whether the node's topology data has changed since the last poll.