中文摘要：

带缓存交叉开关交换单元在支持组播交换方面具有固有优势，然而仿真结果表明：组播业务的增加会阻塞单播业务进而导致交换系统整体性能的下降。提出了支持单组播业务混合调度的MCICQ交换结构，采用简单的MFDR调度策略就能够有效解决单组播业务在交叉开关交换单元内部的带宽冲突问题；针对单组播业务对QoS的不同需求，在MFDR的基础上给出了MFS调度策略．MFS除具有良好的可扩展性外，还能够为单组播业务提供不同带宽保证。

英文摘要：

Buffered crossbar switches have inherent advantages in supporting multicast traffic, and scheduling policies can be simplified to a great extent when distributed scheduling mechanism is applied. However, simulation results indicate that the increment of multicast traffic will block unicast, and finally reduce the performance of the entire device. In order to overcome this deficiency, a new switching fabric MCICQ （Multicast supporting CICQ） was proposed which supported the uni-/multicast hybrid scheduling, and scheduling policies AtFDR and MFS which supported the parallel distributed uni-/multicast were proposed. W~th the fan-out splitting mechanism, both MFDR and MFS can achieve good performance without speedup, and their complexity is only 0（1）. MFS scheduling policy can also provide different bandwidth guarantees for uni-/multicast traffic. Simulation results under SPES show that both MFDR and MFS can achieve good performance.