Editing Border Gateway Protocol (section)

=== Open Packet ===

; Version (8 bits): Version of BGP used.
; My AS (16 bits): Senders [[autonomous system (Internet)|autonomous system]] number.
; Hold Time (16 bits): Timeout timer, used to calculate  KeepAlive messages. Default 90 seconds.
; BGP Identifier (32 bits): IP-address of sender.
: Optional Parameters Length (8 bits): total length of the Optional parameters field.
'''Example of Open Message'''
 Type: Open Message (1)
 Version: 4
 My AS: 64496
 Hold Time: 90
 BGP Identifier: {{IPaddr|192.0.2.254}}
 Optional Parameters Length: 16
 Optional Parameters:
  Capability: Multiprotocol extensions capability (1)
  Capability: Route refresh capability (2)
  Capability: Route refresh capability (Cisco) (128)