(6/1)Maximum numbers of prefixes reached
(6/2)Administrative shutdown
(6/3)Peer de-configured
(6/4)Administrative reset
(6/5)Connection rejected
(6/6)Other configuration change
(6/7)Connection collision resolution
(6/8)Out of resources

log example : BGP: %NOTIFICATION: received from neighbor XXXX.XXXX.XXX.XXX 6/5 (Cease/Connection Rejected) 0 bytes