LLQ defined under the interface would only come into picture when there is congestion if not then it can be utilize by other classes.
Ref:
http://www.cisco.com/web/learning/le31/le46/cln/qlm/CCVP/qos/congestion-management-configuring-cbwfq-and-llq-2/player.html
http://www.netcontractor.pl/blog/?tag=cbwfq
http://www.cathayschool.com/llq-or-pq-cbwfq-a445.html
HTH
Regards
Inayath
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