1. Reliable WDM Multicast in Optical Burst-Switched Networks Myoungki Jeong, Chunming Qiao and Yijun Xiong Dep. Of EE and CSE State University of New York at Buffalo OptiComm 2000, SPIE

2. Multicasting on IP over WDM Networks

3. Loss Recovery Properties in OBS Networks Avoidance of implosion. Local recovery. No duplicate transmission. Closest responder. Adaptability.

4. A Backbone OBS Network AS WDM Links

5. Notations of The Loss Recovery Method Branching switch (BS) : a WDM switch that has more than one downstream. Member switch (MS) : a WDM switch with a edge router attached, which is a member of a multicast group. Responder : an edge router that responds to the retransmission request. Target switch : a WDM switch that receives an encapsulated control packet and then multicasts the corresponding burst/control packet to its downstreams. Subcasting : a means to multicast a lost burst to a subtree of the multicast tree, starting from a target switch.

6. Burst Loss and Retransmission

7. Target Switch and Retransmission Request

8. Retransmission and Subcasting

9. Average Delivery Latency

10. Retransmission Bandwidth

11. Burst State Holding Time at BS

12. Conclusion A reliable WDM multicast protocol in OBS networks is proposed. The proposed protocol operates at the WDM link layer and requests some additional functions to be performed at WDM switch. The overhead is manageable.