From reading the OSPF RFC, I have a question:
OSPF sends triggered updates(30 minutes) and LSA when a change in the topology occurs.
It is not clear to me how the OSPF network will "find out" that a change occurs. Let's say a link on interface of RouterF goes down the hill. Is it the Hello protocol (sent every 10 sec) the 'hearbeat' to find out that such link went down, and that would trigger routers to send an LSA to the DR, which in turn would flood the network with LSA ? Is that right ?
9.5. Sending Hello packets
"... Hello packets are sent out each functioning router interface. They
are used to discover and maintain neighbor relationships.[6] On
broadcast and NBMA networks, Hello Packets are also used to elect the
Designated Router and Backup Designated Router..."
