Enterprise Network Models in .NET

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One useful and popular model to describe enterprise network architecture was introduced by Cisco Systems Any model, of course, is a guideline, and, as shown in Figure 22, this model has been used with both WAN and LAN cores The model divides the network into three tiers: 1 Access Contains end users and local servers It is possible to put centralized servers in an access tier, but, when doing so, it is usually best to put the individual servers of a local cluster into the access tiers Load distribution to these servers is at the next tier 2 Distribution Contains devices that transition between environments (for example, LAN to WAN, building to campus, or to different transmission technology) Often, the distribution tier requires the greatest intelligence for protocol conversion, buffering, and so on The term edge is preferred in provider rather than enterprise use, and sometimes substitutes for distribution even in the enterprise 3 Core Efficiently links sites of the infrastructure May be a collapsed LAN backbone primarily of layer 2 and inter virtual LAN (VLAN) devices, or may be a set of routers One enterprise guideline is that layer 2 relays tend to have all their interfaces inside tiers, while layer 3 relays (that is, routers) and higher layer relays (for example, firewalls and proxies) tend to have interfaces between different tiers This guideline is not terribly rigorous, as a speed-shifting switch between a workgroup and a building (or campus) core often logically straddles the top of the access tier and the bottom of the distribution tier Large distribution networks include multiple levels of concentration When demand access is involved (for instance, dial-up), it can be convenient to put end hosts and access routers in the access tier, dial-in servers at the bottom of the distribution tier, and concentrating routers inside the distribution tier Large routers link regions to a core router or complex of routers Another
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Set of Site-Interconnecting WANs
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Distribution
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Concentration and Protocol Translation (eg, Building switches, Routers) User/Server Access Devices User Hosts
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Figure 22 Three-layer model
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function that fits nicely in the distribution tier is that of firewalls or border routers providing connectivity outside the enterprise (See Figure 23) In Figure 23, note that the central servers themselves are at the distribution tier, but that user connectivity to them comes through the core and that they have their own interserver links at the access tier Having isolated links and possibly specialized hosts, such as backup machines, for large servers can keep a great deal of traffic localized and avoid negative performance impact This model works well for networks of medium size Small networks may collapse certain of the tiers together, and very large networks become more like carrier networks In the optimal use of this model, the customer access router is closest to the end hosts, customer core routers link campuses or sites, and distribution routers perform concentration and translation functions between access and core External connectivity is generally a function of the distribution tier, although if all otherwise unknown traffic defaults to a central external router, that router might be in the customer core The model has limitations in large enterprise networks, where there may be multiple operational levels of local, regional, and national/international corporate backbones One approach, shown in Figure 24, is to apply the model recursively, where the top level of one organizational level becomes the bottom level of another organizational level The recursive approach really does not work well, because each tier, and each of the devices that commonly straddle the tiers, has distinctive characteristics An access device does not share characteristics with a core device in a larger network Another method is to create additional core layers for major geographic levels, such as national and intercontinental Figure 25 shows the logical design I did for an international manufacturing company in which there was relatively little communications among the regions, but all regions had significant communications with headquarters It was reasonable to have all inter-regional communication go through headquarters In Figure 25, note that the headquar-
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