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Tree-shared multicasting in OBS networks can achieve bandwidth savings, less processing load, and lower burst blocking (loss) probability. In this paper, we propose several distributed shared multicast tree construction protocols, namely greedy-prune, non-member-join, all-member-join, closest-member on-tree (CMOT), and closest-node on-tree (CNOT), for tree-shared multicasting in OBS networks. For performance comparison, we also consider an optimal shared tree which is modeled as Steiner minimal tree. We evaluate the proposed protocols using simulations in terms of cost of the shared tree to the optimal shared tree. Simulations show that the CNOT and CMOT protocols outperform the other three proposed protocols in terms of the cost of the shared tree, and perform close to cost of the optimal shared tree.