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Conceptually, anything that was done with the backbone could be repeated for the distribution centers to interconnect individual sites to the internetwork However, the distribution centers have a different function to perform than the backbone links and routers, which makes the star topology with dial backup by far the most common choice The link between a distribution center and a particular office where users are located has to carry traffic only for that office and therefore has a lower bandwidth requirement than does a backbone link This makes dial backup utilizing technologies such as ISDN more attractive, as the dial-up link in this situation is more likely to be able to handle the traffic The other network topologies are feasible, but the cost is rarely justified Assuming that at the distribution level we have individual links going from the distribution center to each site, we have a choice to make regarding dial backup We can provide no dial backup if the network connection is not mission-critical, provide dial backup to the distribution center, or provide a central dial backup solution at the head office Deciding whether to provide one central pool of dial ports or distributed ports at each distribution point depends on what the users at each site ultimately need to access Given that the remote sites need access to head office hosts, we have to consider where other servers, such as e-mail and office automation servers, will be located The options for locations for these types of servers are the head office, the distribution center, and the remote site The most efficient design from the perspective of dial-up port utilization is to provide one central pool of ports This enables you to provide the least number of ports and still provide sufficient backup capability for realistic network outages If separate pools of ports are made available at each distribution center, more ports overall are necessary to provide adequate cover If all services to which users need access over the internetwork are located at the head office, it makes sense to go with one pool of ports located at the head office If the user sites need access to servers located at the distribution centers as well as at the head office, it makes more sense to provide individual dial-up pools at the distribution centers There is one additional benefit to providing a central dial-up pool at the head office, and that is if a major outage that affects the whole internetwork, the dial-up pool can be used to bypass the internetwork That option is not available with distributed dial-up pools in the distribution centers There might be a slim chance that something will happen to bring down the entire internetwork, but it is not unheard of More than one well-known long-distance telephone company has had problems on its network that have affected regional and even national data services All of this seems quite simple and is basically common sense; the decision of where to locate the dial-up ports, however, is inexorably linked to the IP addressing scheme used and the routing protocol implemented Route summarization is a feature of IP networking using distance vector routing protocols such as IGRP Let's discuss what this means with reference to Fig 7-6
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Figure 7-6: IP addressing scheme that requires sites to use dial backup located in thedistribution center
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This figure shows an internetwork utilizing the addresses reserved by the InterNIC for companies using network address translation to connect to the Internet The backbone uses the Class B network number and the distribution centers use Class C addresses implemented with a 255255255224 subnet mask This gives six subnets, each supporting a maximum of 30 hosts Assuming that a distance vector routing protocol is in use, route summarization means that the distribution center shown will only advertise each Class C network back to the backbone, as the backbone is a different network number Under normal conditions this is okay, because traffic traveling from the head office network to a Class C subnet will take the same path through the backbone until it reaches the distribution center If, however, site A in Fig 7-6 loses its link to the distribution center and dials in to a central pool of dial-up ports, we have a problem We now have two physical connections between the 1721600 network and the 19216810 network In this situation, routers at the head office will have to choose between a route to the 19216810 network via the dial-up port, or through the backbone This is because the routing tables in the head office routers will accept only whole network number for networks that are not directly connected What ends up happening is that whichever of the two routes to 19316810 has the lowest metric is the one that gets entered in the head office routing tables, and the other route to the 19316810 network will never get traffic If this network numbering scheme is chosen, distributed dial-up port pools are the only option If the whole internetwork was based on the one Class A or Class B network, appropriately subnetted, either central or distributed dial-up port pools would work This is because all sites are on the same major network number and subnet mask information is utilized throughout the internetwork to identify where individual subnets are physically attached
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