Editing Border Gateway Protocol (section)

=== Message header format ===

{| class=wikitable style="text-align:center; border:none; background:none; color: inherit;"
|+BGP version 4 message header format{{Ref RFC|4271|section=4.1|notes=no}}
|-
! style="width:4%;"|bit offset
! colspan="16" style="width:50%;"| 0–15
! colspan="8" style="width:25%;"| 16–23
! colspan="8" style="width:25%;"| 24–31
|-
! 0
| rowspan="4" colspan="32"| Marker (always: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff)
|-
! 32
|-
! 64
|-
! 96
|-
! 128
| colspan="16"| Length
| colspan="8"| Type
| colspan="8" style="border: none; background:none; color: inherit;"|
|}
* '''Marker''': Included for compatibility, must be set to all ones.
* '''Length''': Total length of the message in [[Octet (computing)|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)

note: "Marker" and "Length" is omitted from the examples.