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)
Read more about this topic: Border Gateway Protocol
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—Mary Pipher (20th century)
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