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the other end are required by local LSDB. Then, it is required to send LSR packet to request to the
opposite for the required LSAs. The contents include the summary of the required LSA.
Link State Update Packet (LSU Packet):
It is used to send the required LSA to the router at the other end. The content is the collection of
multiple LSAs (all contents).
Link State Acknowledgment Packet (LSAck packet) is used to acknowledge the received LSU
packet. The content is the Header of LSA to be confirmed (an LSAck packet can acknowledge
multiple LSAs).
4. Neighbor and Neighboring
In OSPF, Neighbor and Adjacency are two different concepts.
After the start-up of OSPF router, it will send out Hello packets through the OSPF interface. Upon
receipt of Hello packet, OSPF router will check the parameters defined in the packet. If both are
consistent, a neighbor relationship will be formed. Not all both sides in neighbor relationship can
form the adjacency relationship. It is determined based on the network type. Only when both sides
successfully exchange DD packets and LSDB synchronization is achieved, the adjacency in the true
sense can be formed.
9.2.3.4 OSPF Configuration
Page Wizard: Routing -> Dynamic Routing → OSPF
The meanings of key items in the page are shown in the table below.
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