root@ldap-server:~# ldapsearch -LLL -Y EXTERNAL -H ldapi:/// -b "cn=config" -s base olcLogLevel
SASL/EXTERNAL authentication started
SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
SASL SSF: 0
dn: cn=config
olcLogLevel: stats