Determine the connector IDs of the directory sources being synchronized by looking in the central audit.log. At startup, the central logger logs the IDs of each connector and the directory source that it manages. Look for the last instance of the startup banner for the most recent information.
CNN101 is a Sun Directory Connector that manages dc=example,dc=com
[2006/03/19 00:00:00.722 -0600] INFO 16 "System Component Information: SysMgr_100 is the system manager (CORE); console is the Product Console User Interface; CNN101 is the connector that manages [dc=example,dc=com (ldap://host1.example.com:389)]; CNN100 is the connector that manages [example.com (ldaps://host2.example.com:636)];"