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Flooding the LSA to Other Neighbors

Whenever a new LSA is installed in the LSDB—because it was received from another router or was locally originated—the new LSA needs to be distributed to all other routers in the OSPF domain. OSPF does not try to send LSAs directly to all known routers in the domain; this approach would not work. Instead, OSPF relies on hop-by-hop flooding.

The main principle of flooding is that once an LSA has been either reliably delivered to a router or locally originated, the router reliably sends the LSA to all other nei...