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entire network s ability to seek optimal routing decisions fails. Second, because all nodes in the network must go to that central device for routing instructions, a significant choke point can result. There are several options that can reduce the vulnerability of a single point of failure. The first, of course, is to distribute the routing function. This conflicts with the concept of centralized routing, but only somewhat. Consider the Internet, for example. It uses a sort of hybrid of centralized and distributed routing protocols in its Domain Name Server (DNS) function. A limited number of devices are tasked with the responsibility of maintaining knowledge of the topology of the network and the location of domains, providing something of a AAA trip-planning service for data packets. Another option is to designate a backup machine tasked with the responsibility of taking over in the event of a failure of the primary routing machine. This technique, used in the early Tymnet packet networks, relied on the ability of the primary machine to send a sleeping pill packet to the backup machine, with these instructions: Pay attention to what I do, memorize everything I learn, but just sit in the corner and be a potted plant. Take no action, make no routing decisions just learn. Let the sleeping pill keep you in a semicomatose state. If for some reason I fail, I will stop sending the sleeping pills, at which time you will wake up and take over until I recover. An ingenious technique, but overly complex and far too failure prone for modern network administrators. Distributed routing protocols are far more common today. In distributed routing protocol environments, each device collects information about the topology of the network and makes independent routing decisions based upon the information it accumulates. For example, if a router sees a packet from source X arrive on port 12, it knows that somewhere out port 12, it will find destination X. It doesn t know how far out there necessarily, just that the destination is somewhere out there over the digital horizon. Thus, if a packet arrives on another port looking to be transmitted to X, the router knows that by sending the packet out port 12 it will at least get closer to its destination. It therefore makes an entry in its routing tables to that effect, so that the next time a packet arrives with the same destination, the switch can consult its table and route the packet quickly. These routing protocols are analogous to the process of stopping and asking for directions on a road trip (or not), reputedly one of the great male-female differentiators right after who controls the TV remote. Anthropologists must have a field day with this kind of stuff. According to apocryphal lore, women have no problem whatsoever stopping and
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asking for directions, while men are loathe to do it one of those silly threats to the manhood things. Anyway, back to telecomm. If you were planning a road trip across the country, you could do so using one of two philosophies. You could go to AAA or a travel agent and have them plan out the entire route for you, or you could do the Jack Kerouac thing and simply get in the car and drive. Going to AAA seems to be the simplest option because, once the route is planned, all you have to do is follow the directions Lewis s blazed trail, as it were. The downside is that if you make it as far as Scratch Ankle, Alabama (yes, it s a real place), and the road over which you are supposed to travel is closed, you are stuck you have to stop and ask for directions anyway. The alternative is to simply get in the car, drive to the nearest gas station, and tell them that you are trying to get to Dime Box, Texas. The attendant will no doubt tell you the following: I don t know where Dime Box is, but I know that Texas is down in the Southwest. So if you take this highway here to Kansas City, it ll get you closer. But you ll have to ask for better directions when you get there. The next gas station attendant may tell you, Well, the quickest way to central Texas is along this highway, but it s rush hour and you ll be stuck for days if you go that way. I d take the surface street. It s a little less comfortable, but there s no congestion. By stopping at a series of gas stations as you traverse the country and asking for help, you will eventually reach your destination, but the route may not be the most efficient. That s okay, though, because you will never have to worry about getting stuck with bad directions. Clearly the first example of these is connection oriented; the second is connectionless. Connection-oriented travel is a far more comfortable, secure way to go; connectionless is riskier, less sure, more flexible, and much more fun. Obviously, distributed routing protocols are centrally important to the traveler as well as to the gas station attendant who must give them reliable directions, and equally important to routers and switches in connectionless data networks. Distributed routing protocols fall into two categories: distance vector and link state. Distance vector protocols rely on a technique called table swapping to exchange information about network topology with each other. This information includes destination/cost pairs that allow each device to select the least cost route from one place to another. On a scheduled basis, routers transmit their entire routing tables on all ports to all adjacent devices. Each device then adds any newly arrived information to its own tables, thus ensuring currency. The only problem with this technique is that it results in a tremendous amount of management traffic (the tables) being sent between network devices, and if the network is
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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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