The BGP Finite State Machine

The stages of a BGP connection establishment and maintenance can be described in terms of a finite state machine. Figure 2-20 and Table 2-4 show the complete BGP finite state machine and the input events that can cause a state transition.

Mgure 2-20 The BGP Finite State Machine

Mgure 2-20 The BGP Finite State Machine

Bgp States
Table 2-4 The Input Events (IE) of Figure 2-20

IE

Description

1

BGP Start

2

BGP Stop

3

BGP Transport connection open

4

BGP Transport connection closed

5

BGP Transport connection open failed

6

BGP Transport fatal error

7

ConnectRetry timer expired

8 Hold timer expired

9

Keepalive timer expired

10

Receive Open message

11

Receive Keepalive message

12

Receive Update message

13

Receive Notification message

The following sections provide a brief description of each of the six states illustrated in Figure 2-20.

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