1. Neighbor - router enabled with same LSP
2. Link - router's up interface
3. LS Routing Process
   1. Directly Connected Networks
   2. Directly Connected Routers (HELLO Protocol)
   3. Build LSP(Link-State Packet)
      1. Interface IP/mask
      2. type of network
         1. Ethernet
         2. serial point-too-point
      3. cost of the link
      4. neighbor routers
   4. Flood LSP
   5. LS Database (LSDB)
   6. SPF(Shortest Path First) Tree
      1. Generating Routing Table
4. Requirements
   1. Memory
   2. Process
   3. Bandwidth
5. Advantages
   1. Topological Map
   2. Fast Convergence
   3. Even Driven Updates
   4. Hierarchical Design
      1. Concept Of Areas
6. Protocols
   1. OSPF
      1. v2 - IPv4
      2. v3 - IPv6
   2. IS-IS