Tente:
logging server X.X.X.X 7 use-vrf default
logging monitor 7
logging level local0 7
logging level local1 7
logging level local2 7
logging level local3 7
logging level local4 7
logging level local5 7
logging level local6 7
logging level local7 7
logging logfile messages 6
O que dá:
2012 Nov 8 19:05:48 NEXUS01 %AUTHPRIV-5-SYSTEM_MSG: