Border Gateway Protocol - Message Header Format

Message Header Format

The following is the BGP version 4 message header format:

bit offset 0–15 16–23 24–31
0 Marker
32
64
96
128 Length Type
  • Marker: Included for compatibility, must be set to all ones.
  • Length: Total length of the message in octets, including the header.
  • Type: Type of BGP message. The following values are defined:
    • Open (1)
    • Update (2)
    • Notification (3)
    • KeepAlive (4)
    • Route-Refresh (5)

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