Fiber Distributed Data Interface (FDDI) local area networks (LAN's) are used either as high-speed links between computers and peripherals, or as backbones for lower-speed LAN's, such as Ethernet and Token Ring. The availability of such a high-speed channel will lead to the implementation of high-performance distributed environments spread over a wider area than that allowed by commonly used LAN's. The performance of such distributed environments will strongly depend on that of the interconnecting devices. In this paper, two different algorithms for packet filtering are discussed, referring to bridges interconnecting Ethernet LAN's to FDDI backbones. Algorithm performance is compared with respect to 1) the traffic increase produced on a local Ethernet, and 2) the maximum allowed traffic on remote Ethernets.
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