OSPF Common Header Fields

• Version (1 byte)

• • 1 or 2

• Type (1 byte)

• • 1 = hello
  • 2 = Exchange
  • 3 = Link state request
  • 4 = Link state update
  • 5 = Link state ack

• Packet length (2 bytes)

• • Length in bytes of the entire OSPF packet