ospf is routing protocol (protocol fill routing tabel of router with all possible routes in same AS)
ospf is link state routing protocol : (router hold the topologe of network - map of it- and if topology chang_state of one of his links(neighbour) _ ,it send lsa to all routers to draw the map again)
it start with :
router discover his neighbours with hello messages
send topology info (what is his RID
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