Question on ldap directory design

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hi,

When I bind to the root directory,  I saw this. What is this ? How come
display like this. Do you have any document related to this situation ?
Also, I cannot view deeply for each child.

o=University of Michigan, c=us
    --- ldap://ldap.itd.umich.edu:389/cn=Manager,dc=umich,dc=edu
    --- ldap://ldap.itd.umich.edu:389/ou=Group,dc=umich,dc=edu
    --- ldap://ldap.itd.umich.edu:389/ou=People,dc=umich,dc=edu
    --- ldap://ldap.itd.umich.edu:389/ou=Security,dc=umich,dc=edu

Thanks for help.

Florence