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Internetwork Topology
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In general, we can identify three classes of service within an internetwork: backbone, distribution, and local services These three levels of service define a hierarchical design The backbone services are at the center of the hierarchy, and handle routing of traffic between distribution centers The distribution centers are responsible for interfacing the backbone to the local services, which are located in each site At each site, the local services connect individual hosts (multiuser machines and PC workstations) to the distribution network In the requirement we have specified above, each major location, such as New York, Atlanta, and Los Angeles, becomes a distribution center, as illustrated in Fig 7-1 The distribution center concept is a simple one in that it can be used to associate a specific range of IP addresses with one geographic location This simplifies matters when troubleshooting, can reduce the size of routing tables, and hence can reduce the size of routing updates
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Figure 7-1: Distribution centers connected via a backbone network
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This topology gives you the flexibility to implement either a distance vector or link state routing protocol We shall now look at alternatives for interconnecting sites on the backbone
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Backbone Topologies
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The following discussions are based on connecting the main centers together The goals for this part of the hierarchy are high availability, higher levels of throughput, and the ability to add new distribution centers with a minimum of disruption of service to the internetwork as a whole Star Topology The star network topology is illustrated in Fig 7-2, which shows Chicago in the center, with all lines emanating from there to the main locations This topology is a simple one to understand and troubleshoot It does, however, place a greater processing burden on the central router located in Chicago, because all traffic passing between distribution centers must pass through that router In addition, only one full-time connection goes to each location That means that if one of the main lines from a distribution center to the central site fails, all communication to or from that center stops until some dial backup mechanism reestablishes the link
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Figure 7-2: A backbone network utilizing a star topology
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If the bandwidth necessary to provide full communications between a distribution center and the central site is greater than 128 kbps (what is achievable with a single ISDN connection), there are no simple and inexpensive ways to establish a dial backup connection Multilink PPP is just becoming available, and there are some proprietary ways to perform what is termed inverse multiplexing, the combining of several ISDN connections and making them appear as one line This could be an option for the star topology if you decide to implement it Ring Topology The ring topology, as its name suggests, forms a ring around all the main distribution centers (Fig 7-3) The advantage is that each site has two permanent connections to it, so in the event of a single line failure, an alternate path is available to deliver traffic
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Figure 7-3: A backbone network utilizing a ring topology
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The downside is that traffic destined for Dallas from Chicago has to pass along the link from Chicago to New York, then to Atlanta, and finally to Dallas This places a higher bandwidth utilization on the Chicago-to-New-York link than is necessary, because that link is carrying traffic destined for Dallas Also, since it uses more lines than the star topology, there is less likely to be money for a dial backup system, which is okay since there are two lines feeding each location If any two lines fail, however, the network is down hard until one of them comes back
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Fully Meshed Topology This is the ultimate in resiliency, minimizing the number of intermediate routers through which traffic must pass, and reducing the amount of traffic on each link The obvious drawback is the cost of all the leased lines There are very few situations that justify a fully meshed network, because just adding one more distribution center to the backbone takes up significant resources in terms of router ports at each location A fully meshed network is shown in Fig 7-4
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