BGP/6/PEER_STATE_CHG

Previous state:

• Idle: indicates that BGP denies any connection request. This is the initial status of BGP.
• Connect: indicates that BGP is waiting for the establishment of the TCP connection before performing further actions.
• Active: indicates that BGP tries to establish a TCP connection. This is the intermediate status of BGP.
• OpenSent: indicates that BGP is waiting for an Open message from the peer.
• OpenConfirm: indicates that BGP waits for a Notification message or a Keepalive message.
• Established: indicates that BGP peers can exchange Update, Notification, and Keepalive messages.

Current state:

• Idle: indicates that BGP denies any connection request. This is the initial status of BGP.
• Connect: indicates that BGP is waiting for the establishment of the TCP connection before performing further actions.
• Active: indicates that BGP tries to establish a TCP connection. This is the intermediate status of BGP.
• OpenSent: indicates that BGP is waiting for an Open message from the peer.
• OpenConfirm: indicates that BGP waits for a Notification message or a Keepalive message.
• Established: indicates that BGP peers can exchange Update, Notification, and Keepalive messages.

Input event:

• START: creates a connection.
• STOP: interrupts a connection.
• IH_TIMER: indicates that the idle hold timer expires.
• CR_TIMER: indicates that the connect retry timer expires.
• OD_TIMER: indicates that the Open delay timer expires.
• HOLD_TIMER: indicates that the hold timer expires.
• KA_TIMER: indicates that the keepalive timer expires.
• TCP_SUCCEED: indicates that the TCP connection is established successfully.
• TCP_FAIL: indicates that the TCP connection fails to be established.
• TCP_INCOMING: indicates that a request for establishing a TCP connection is received.
• RECV_OPEN: indicates that an Open message is received.
• RECV_KA: indicates that a Keepalive message was received.
• RECV_UPDATE: indicates that an Update message was received.
• RECV_RR: indicates that a message carrying the Route-Refresh option is received.
• RECV_NOTIF: indicates that a Notification message is received.
• RECV_NOTIF_VER: indicates that a message indicating an incorrect BGP version is received.
• RECV_HEAD_ERR: indicates that an incorrect BGP packet header is received.
• RECV_OPEN_ERR: indicates that an error Open message is received.
• RECV_UPDATE_ERR: indicates that an error Update message is received.
• RECV_RR_ERR: indicates that an error message containing the Route-Refresh option is received.
• OPEN_COLLION_DUMP: closes a collision connection.
• LINK_UNREACHABLE_DETECTED: indicates that the link is unreachable.