When an OSPF network is converged and no network topology change has been detected by a router, LSU (Link State Update) packets are sent to neighboring routers every 30 minutes. This periodic update ensures that OSPF neighbors remain synchronized even in the absence of topology changes. Updates (LSUs) are sent under two main conditions:
- When a network topology change is detected (incremental updates)
- Every 30 minutes, as a keep-alive and synchronization mechanism
Thus, in a stable OSPF network without topology changes, LSU packets are still sent every 30 minutes to neighboring routers to maintain consistency and synchronization of the link-state database across the network.
