OV- ers the Batcher-Banyan networks. In their book High Performance Communication Networks, Walrand and P. Varaiya provide among other things an especially nice discussion of modular switches and performance. V. Benes' "Optimal Rearrangeable Multistage Connecting Networks" is also a classic. Articles written by C. L. Wu and T. Y. Feng, and C. Leiserson cover several interesting topologies. The article "Nonblocking Copy Networks for Multicast Packet Switching" by T. Lee discusses a nonblocking copy scheme for multicast switches. F. M. Chiussi and A. Tobagi, and D. Khotimsky cover resequencing protocols and issues. B. Suter et al., M. Arpaci and J. Copeland, and S. Floyd and V. Jacobson have written about buffer management issues when a switch must control the flow by dropping packets. Backpressure is introduced in the article "New Directions in Communications Which Way to the Information Age?)" by J. Turner. This work has been expanded to discuss multi- cast in J. Turner's article "Design of a Broadcast Packet Switching Network." In their article "Deadlock-Free Message Routing in Multiprocessor Interconnection Networks," W. Dally and C. Seitz first talk about the so-called wormhole routing approach, where variable-length packets are segmented into flits. W. Dally continues this discussion in his article "Virtual-Channel Flow Control," which examines virtual channel for backpressure as a means to reduce the HOL block- ing. Li-Shiuan Peh joins W. Dally to expand on the idea in the article "Flit-Reservation Flow Control." An interesting combination of a buffered crossbar, WFQ scheduling, and backpressure is presented in "Implementing Distributed Packet Fair Queueing in a Scalable Switch Architecture" by D. Stephens and Hui Zhang. Atlas-I is an interesting single-chip ATM switch project where a credit-based multi- lane backpressure protocol has been implemented as a significant improvement against classic virtual channel wormhole backpressure. M. Katevenis and G. Kornaros et al. have written some reports regarding the