27.3.4 Sending LSA
In OSPFv3, neighboring routers exchange link state advertisements (LSAs) to fill the gaps in their routing tables. When a router generates or receives a new LSA, it sends the LSA to all its neighboring routers. This ensures that an identical database is maintained by the Switch and its neighbors. The relationships maintained to create a synchronized database by exchanging LSAs with other routers are called adjacencies.
The Switch uses an LSA synchronization process to send its LSAs to all of its neighboring routers. In turn, the neighboring router sends the LSAs of the Switch to all of its neighbors. Those neighbors then send the LSAs to all of their neighbors. By this process, the LSAs of the Switch are distributed to every router in the area.
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(1) Age of LSA
The age of an LSA is the length of time since it was generated. An LSA remains valid until its age reaches 3600 seconds or it is deleted by the originating router. The switch adds a delay time (set by the ipv6 ospf transmit-delay command) to the value of the Age field in valid LSAs it transmits.