Message Types

• OSPF routers communicate by sending Link State Advertisement (LSAs) to each other.

  • Type 1 - Router Links Advertisement
  • Type 2 - Network Links Advertisement
  • Type 3 - Summary Links Advertisement
  • Type 4 - AS Boundary Router Summary Link Advertisement
  • Type 5 - AS External Link Advertisement
  • Type 6 - Multicast Group Membership LSA
    

• LSAs contain sequence numbers to detect old and duplicate LSAs.

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