No it does not. You could take a look at the BST implementation. It is based on Bidir PIM-SM. Nader >>>>> "Vijayan" == Vijayan Ramakrishnan <vramakri@cs.uiowa.edu> writes: Vijayan> Does CtrMcast use shared bi-directional trees ? If Vijayan> not is anyone working on it ?? Vijayan> - vijayan