Use this command to display SNMPv3 users:
show snmp user [list] | [user] | [remote remote] [volatile | nonvolatile | read-only]
System(su)->show snmp user Extremenetworks_user EngineId xxxxxxxxxxxxxxx= 80:00:15:f8:03:00:e0:63:9d:cb:89 Username = Extremenetworks_user Auth protocol = usmHMACMD5AuthProtocol Privacy protocol = usmDESPrivProtocol Storage type = nonVolatile Row status xxxxxxxxxxxxx= active