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OSTF - Coggle Diagram

- - - - (Down State)
        
        (init State)
        
        (two-way State)
        
        (Elect the DR and BDR)
  - - - R1 compares the information received with the information it has in its own LSDB. If the DBD packet has a more current link-state entry, the router transitions to the Loading state.
- - - - Hello Packet: Thenhello packet is use to:
        -Discover OFPS neighbore and stabilish adjacencies
        -Advertise paraments,it means that two routers must agree
        to become neighbore
        -Elect the Designated Router (DR) and Backup Designated Router (BDR) on multicases network
- - - - Establish Neighbor Adjacencies
      - Exchange Link-State Advertisements
      - Build the Link State Database
      - Execute the SPF Algorithm
      - Choose the Best Route
      - 1.1.4 Single-Area and Multiarea OSPF
        
        Single-Area OSPF - All routers are in one area. Best practice is to use area 0.
        
        Multiarea OSPF - OSPF is implemented using multiple areas, in a hierarchical fashion. All areas must connect to the backbone area (area 0). Routers interconnecting the areas are referred to as Area Border Routers (ABRs).
        
        1.1.5 Multiarea OSPF
        
        With multiarea OSPF, one large routing domain can be divided into smaller areas, to support hierarchical routing.
        For instance, any time a router receives new information about a topology change within the area (including the addition, deletion, or modification of a link) the router must rerun the SPF algorithm, create a new SPF tree, and update the routing table.
        
        1.1.6 OSPFv3
        
        OSPFv3 is the OSPFv2 equivalent for exchanging IPv6 prefixes. Similiar to its IPv4 counterpart, OSPFv3 exchanges routing info to populate the IPv6 routing table whit remote prefixes
        
        OSPFv2 and OSPFv3 Data Structures