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Defining Services: The Context for Policy
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Policy was originally a military term [Gorlitz 1975] referring to guidance by a commander to subordinates, the goal of which was to help the subordinates make the same decision the commander would, but in his absence It was not seen as rigid rules, but as guidance for intelligent people The meaning has evolved over time Most readers have encountered the surly clerk who responds, It s not our policy, when he or she really means, It s not our rule, or, potentially, Stop bothering me Clausewitz defined war as the continuation of national policy by military means: War, therefore, is an act of policy not a mere act of policy, but a true political instrument, a continuation of political activity by other means [Clausewitz] In building a modern WAN, the customer first needs to decide on the rules for continuing business policy into the geographic distribution enabled by WAN service Network architects need to help the customer clarify confused assumptions that go into policy formulation, and then to specify a set of means that carry out the policies A customer defines policies that represent business choices and requirements An example of such a policy in the telephone system is selection of a long-distance carrier The end user subscribes to a particular interexchange carrier, and it is the responsibility of the local exchange carrier to be able to reach that IXC There will be levels of policies, and differences between the broad policy definition and the specific enforcement of a technical policy When you work for a carrier, you need to verify that your connectivity to the user sites (that is, technical policy enforcement for provisioning) is sufficient to carry out the business policies you agree to with your customer At the same time, carrier staffs need to avoid providing to sites too much capacity that will go unused (or unpaid for) for the expected project lifetime There is a delicate balance in providing facilities, however: It is extremely expensive to install new physical transmission paths of copper or optical fiber It is considerably less expensive to install higher-capacity electronics at the ends of the path The trend is to install upwardly compatible facilities either fiber that will support a wide range of new optical technologies, or copper pairs that can support the higher-speed digital subscriber line (DSL) technologies Having vented my spleen about misuse of the term policy, I must note that there are some valid uses for it in modern networking I suggest that a networking policy is most usefully considered a user objective For example, the applications staff of an enterprise might specify a quality-of-service policy for an interactive transaction processing application, which would define the maximum latency the application needs in order to provide its response time goal
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Services, Service Level Agreements, and Delivering Service
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The information technology (IT) staff of this enterprise would refine this user policy, determining the contributions of latency of the end hosts and the enterprise s local network, and then determining the maximum latency of WAN links used by the application While the terms quality-of-service policy and service level agreement are often synonymous, a service level agreement (SLA) is most often a contract between the user of a service and the provider of a service End user organizations often write SLAs with their enterprises IT staffs, which, in turn, contract with WAN providers for WAN SLAs that will work in the context of the broader SLAs WAN service providers need to agree to SLAs that are achievable in the real world Quality-of-service documents glibly speak of best effort versus guaranteed service, and these terms will be discussed further in the next chapter WAN providers offering guaranteed service still have to conform to reality, no matter how their sales departments plead Providers executing a service under an SLA might be faced with a choice imposed by limited resources Under resource constraints, the policy executor must prioritize certain traffic to achieve a performance objective If internal network management traffic and application traffic are contending for the same limited bandwidth, an intelligent executor will prioritize the network management traffic Not to do so is to jeopardize the continuing existence of the network No service can be guaranteed on a broken network For providers and for their customers, policies must recognize the realities of budgets The monetary cost of a service is an obvious aspect of budgeting in the network, but there are other things to budget From a technical standpoint, any interface to a provider has a certain bandwidth If the bandwidth budget is exceeded, something has to compensate Some traffic may need to be delayed or dropped if it is sent beyond the budgeted capacity Time also needs to be considered in the budget If it takes 16 weeks to have the latest, most expandable optical fiber connection to the provider installed, but multiple copper circuits are available in 2 weeks, is the value of long-term expandability worth 14 weeks of delay in starting your connectivity Do interim, lower-capacity methods make sense Do not confuse policies and mechanisms! Policies are formal definitions of the problem you are trying to solve 1 looked at ways of identifying the problem Subsequent chapters will discuss mechanisms for enforcing policies
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