This counter tracks the total number of EIGRP routing update packets sent to all neighbors in this autonomous system. Unlike the steady, predictable hello rate, updates are sent when routes actually change, so a burst in this counter reflects real routing churn, such as new routes appearing, metrics changing, or routes being withdrawn, which an admin can use as a proxy for network stability. A sudden spike in this counter right after a branch office's WAN link flapped would confirm the router is actively propagating the resulting route changes to its other EIGRP neighbors.