When using a DN in any part of Directory Server, you must escape commas and certain other special characters with a backslash (\\). If you are using a DN in a search filter, the backslash used for escaping special characters in DNs must be represented by \\5c. For example:
DN: cn=Julie Fulmer,ou=Marketing\\,Bolivia,dc=example,dc=com
DN in a search filter: ldapsearch -h myServer -b "dc=example,dc=com" "(manager=cn=Julie Fulmer,ou=Marketing\\5c,Bolivia,dc=example,dc=com)"