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Figure 5-20 When one station transmits, all stations hear the message. This can result in significant waste of bandwidth.
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Figure 5-21 Using a bridge to segment a LAN
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intelligent enough to know that the traffic does not have to be forwarded to the other ports. Similarly, if the sales employee now sends a message to someone in shipping, the bridge recognizes that the sender and receiver are on different segments and, thus, forwards the message to the appropriate port, using address information in a table that it maintains (the filter/forward database). Bridges operate at Layer Two of the OSI Model and, as such, are frame switches. Following close on the heels of bridging is LAN switching. LAN switching qualifies as bridging on steroids. In LAN switching, the filter/forward database is distributed that is, a copy of it exists at each port, which implies that different ports can make simultaneous traffic handling decisions. This allows the LAN switch to implement full-duplex transmission, reduce overall throughput delay, and, in some cases, implement per-port rate adjustment. The first 10 Mbps Ethernet LAN switches emerged in 1993, followed closely by Fast Ethernet (100 Mbps) versions in 1995, and Gigabit Ethernet (1,000 Mbps) switches in 1997.
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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5
Fast Ethernet immediately stepped up to the marketplace bandwidth challenge and was quickly accepted as the next generation of Ethernet. LAN switching also helped to propagate the topology called star wiring. In a star-wired LAN, all stations are connected by wire runs back to the LAN switch or a hub that sits in the geographical center of the network, as shown in Figure 5-22. Any access scheme (contention-based or distributed polling) can be implemented over this topology because it defines a wiring plan, not a functional design. Because all stations in the LAN are connected back to a center point, management, troubleshooting and administration of the network is simplified. Today, high-speed LAN switches have become the architectural norm for network deployment in multitenant office buildings and corporate facilities because of low cost, high utility, and ease of management. Contention-based LANs are the most commonly deployed LAN topologies. Distributed-polling environments, however, do have their place.
Distributed-Polling LANs
In addition to the gladiatorial combat approach to sharing access to a transmission facility, there is a more civilized technique known as distributed polling, or as it is more commonly known, token passing. IBM s Token-Passing Ring is perhaps the best known of these products, followed closely by FDDI, a 100 Mbps version occasionally seen in campus and metropolitan area networks (although the sun seems to be setting on FDDI). In token-passing LANs, stations take turns with the shared medium, passing the right to use it from station-to-station by handing off a token that gives the bearer the one-time right to transmit while all other stations remain quiescent. Thus, the Harvard Approach. This is a much
Figure 5-22 LAN switching
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fairer way to share access to the transmission medium than CSMA/CD, because while every station has to wait for its turn, it is absolutely guaranteed that it will get that turn. These systems are therefore characterized by bounded delay, because there is a maximum amount of time that any station will ever have to wait for the token. Token-passing rings work as shown in Figure 5-23. When a station wishes to transmit a file to another station on the LAN, it must first wait for the token a small and unique piece of code that must be held by a station to validate the frame of data that is created and transmitted. Let s assume for a moment that a station has secured the token because a prior station has released it. The station places the token in the appropriate field of the frame it builds (actually, the medium access control scheme, called a MAC scheme and implemented on the NIC card that builds the frame), adds the data and address, and transmits the frame to the next station on the ring. The next station which also has a frame it wishes to send receives the frame, notes that it is not the intended recipient, and also notes that the token is busy. It does not transmit, but instead passes the frame of data from the first station on to the next station. This process continues, station by station, until the frame arrives at the intended recipient on the ring. The recipient validates that it is the intended recipient, at which time it makes a copy of the received frame,
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