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Configuring BGP Services
5-9
BGP Messages
BGP uses four different message types: Open, Keepalive, Update, and
Notification.
All of the messages share a common BGP message header made up of the
following three fields:
Marker
This field is used for authentication. Currently, this field can only be set to all
1s, specifying the null authentication scheme, the only authentication scheme
yet defined.
Length
This field indicates the total length of the message in octets. The value of this
field must be between 19 octets (header-only message) and 4096 octets.
Type
This field indicates the type of message:
1 — Open message
2 — Update message
3 — Notification message
4 — Keepalive message
Open Message
The Open message is used to establish a BGP connection between two BGP
speakers. In addition to the message header, the Open message includes the
following fields:
The BGP Version. Bay Networks currently supports BGP Version 3 and
Version 4.
The AS Number, which provides the autonomous system number of the
transmitting BGP speaker.
The Holdtime, which indicates the maximum number of seconds that can
elapse between the receipt of Keepalive and/or Notification and/or Update
messages. If this timer expires, the receiver assumes the connection is down.
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