OSPF: Steady State Operation

Once a network has stabilized and all routers in the same area have all the exact same LSAs, and the SPF calculation has already determined its best routes, the following applies to devices running OSPF:

  • routers will continue to send Hellos every Hello interval
  • every router expects to receive Hellos from its neighbors within the dead time interval, if not that indicates a neighbor has failed
  • every router originally advertising an LSA will reflood each LSA based on the per-LSA Link State Refresh (LSRefresh) interval which is 30 mins by default
  • every router expects to have its LSA refreshed within the LSA MaxAge timer which is 60 mins by default



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