bgpd/bgp_fsm_quagga.dot

digraph {
  rankdir=LR
  //concentrate=true
  nojustify="true"

  Idle
  Connect
  Active
  OpenSent
  OpenConfirm
  Established
  Clearing
  Idle -> Deleted
  Configured -> Idle
  
  Idle -> Connect [ label="BGP_Start\l/bgp_start\l" ]
  Idle -> Idle [ label="BGP_Stop\l|TCP_connection_open\l|TCP_connection_closed\l|TCP_fatal_error\l/bgp_stop\l"]

  Connect -> Connect [ label="ConnectRetry_timer_expired\l/bgp_reconnect\l" ]
  Connect -> Idle [ label="BGP_Stop\l|TCP_connection_open\l|Receive_NOTIFICATION_message\l/bgp_stop\l" ]
  Connect -> Idle [ label="TCP_fatal_error\l/bgp_connect_fail\l" ]
  Connect -> Idle [ label="Hold_Timer_expired\l|KeepAlive_timer_expired\l|Receive_OPEN_message\l|Receive_KEEPALIVE_message\l|Receive_UPDATE_message\l|Clearing_Completed\l/bgp_ignore"]
  Connect -> OpenSent [ label="TCP_connection_open\l/bgp_connect_success\l" ]
  Connect -> Active [ label="TCP_connection_open_failed\l/bgp_connect_fail\l" ]

  Active -> Idle [ label="BGP_Stop\l|TCP_connection_closed\l/bgp_stop\l" ]
  Active -> Idle [ label="Receive_NOTIFICATION_message\l/bgp_stop_with_error\l" ]
  Active -> Idle [ label="TCP_fatal_error\l|Hold_Timer_expired\l|KeepAlive_timer_expired\l|Receive_OPEN_message\l|Receive_KEEPALIVE_message\l|Receive_UPDATE_message\l|Clearing_Completed\l/bgp_ignore\l" ]
  Active -> OpenSent [ label="TCP_connection_open\l/bgp_connect_success\l" ]
  Active -> Connect [ label="ConnectRetry_timer_expiredl/bgp_start\l" ]

  Accept -> Active [ label="Raise TCP_connection_open on Active" ]

  OpenSent -> Idle [ label="BGP_Stop\l/bgp_stop\l" ]
  OpenSent -> Idle [ label="ConnectRetry_timer_expired\l|Clearing_Completed\l|KeepAlive_timer_expired\l/bgp_ignore\l" ]
  OpenSent -> Idle [ label="Hold_Timer_expired\l/bgp_fsm_holdtime_expire\l"]
  OpenSent -> Idle [ label="Receive_KEEPALIVE_message\l|Receive_UPDATE_message\l/bgp_fsm_event_error" ]
  OpenSent -> Idle [ label="Receive_NOTIFICATION_message\l/bgp_stop_with_error" ]
  OpenSent -> Active [ label="TCP_connection_open\l|TCP_connection_closed\l|TCP_connection_open_failed\l|TCP_fatal_error\l/bgp_stop\l"]
  OpenSent -> OpenConfirm [ label="Receive_OPEN_message\l/bgp_fsm_open" ]
  
  OpenConfirm -> Idle [ label="BGP_Stop\l|TCP_connection_open\l|TCP_connection_closed\l|TCP_connection_open_failed\l|TCP_fatal_error\l/bgp_stop\l"]
  OpenConfirm -> Idle [ label="Hold_Timer_expired\l/bgp_fsm_holdtime_expire" ]
  OpenConfirm -> Idle [ label="ConnectRetry_timer_expired\l|Receive_OPEN_message\l|Receive_UPDATE_message\l|Clearing_Completed\l/bgp_ignore"]
  OpenConfirm -> Idle [ label="Receive_NOTIFICATION_message\l/bgp_stop_with_error\l" ]
  OpenConfirm -> Established [ label="Receive_KEEPALIVE_message\l/bgp_establish\l" ]

  Established -> Clearing [ label="BGP_Stop\l|TCP_connection_open\l|TCP_connection_closed\l|TCP_connection_open_failed\l|TCP_fatal_error\l|ConnectRetry_timer_expired\l|Hold_Timer_expired\l|Receive_OPEN_message\l/bgp_stop\l"]
  Established -> Idle [ label="Clearing_Completed\l/bgp_ignore" ]
  Established -> Clearing [ label="Receive_NOTIFICATION_message\l/bgp_stop_with_error"] 
  
  Clearing -> Idle [ label="Clearing_Completed\l/bgp_clearing_completed" ]
  subgraph cluster_pre_collision_detect {
    label="Prior to collision detection"
    bgcolor=lightgray
    Connect Accept Active OpenSent OpenConfirm
  }

}