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Advertise public routes and VPN to provider Accept default and VPN routes from provider
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to the Medical Center proper, then to the related researchers, then to suppliers, and eventually offered commercial services in the Medical Center area Most of the subscribers are on dedicated fiber within a short distance of the JCMC campus, with a few free-space radio and laser links (see 8) Once the cable TV system became profitable, the city spun it off into a not-forprofit community service, Johnson City Cable (JCC) Again, the remoteness of Johnson City dissuaded large local providers from chasing the local user base JCC provides IP access to its residential cable subscribers, and also handles dial-up connectivity for regional subscribers not in a cable-served area, or when cable is down It contracts with the local telephone company to provide dial servers in remote areas, which, due to regulatory restrictions, only provide PPP connectivity; the actual IP session is between a client associated with the dialup port and a server at JCC (See 7) Johnson City now has two Internet service providers, each with a particular niche and generally cooperative with one another JCC focuses on residential and SOHO applications, while JMedNet focuses on the larger commercial sites (see Figure 311) Both systems have policies of open access on their collector networks, but outside providers have shown little interest As a cable TV provider, JCC does have an assortment of satellite earth stations, and has highbandwidth downlinks and a moderate-bandwidth, high-delay uplink
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Figure 311 Current network of Johnson City
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The Johnson City Medical Center Foundation has received a large grant to improve communications in the area As an interim step, the Medical Center has been connected to a DS3 microwave system leaving the area, and has received permission to allow commercial users on this system until other facilities are available After alternative commercial facilities are available, the microwave system will stay in place as a backup for medical, research, and educational use Communities (see 5) will be used to enforce acceptable use policies (see Figure 312) The city sees one of the fundamental aspects of that improvement to be connecting the external gateways to transcontinental, redundant optical facilities SONET is one possibility, but IP over optical to dif-
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Figure 312 Future network of Johnson City
Services, Service Level Agreements, and Delivering Service Table 310 Summary of Johnson City Requirements Address space Name and address management Separate blocks for JCC and JCMC JCC and JCMC handle their own addressing JCC and JCMC want backup provider DNS L1/2 connectivity Primary T3 or better to POP from both using diverse connectivity Mutual backup between JCC and JCMC Advertise selected routes as belonging to medical community
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Routing requirements
Advertise assigned space and provider-independent customer space to provider Accept default from provider, with medical community routes preferred for JCC
ferent hubs also is a possibility The city also wants to explore cost-effective ways to bring broadband service to the more remote POPs These will generally be beyond the range of free-space optical, and it may be worth considering radio systems rather than pulling fiber Table 310 summarizes Johnson City s requirements
KEY TO THE SOLUTION Take advantage of the cooperative nature of the local service providers, and be sure you take solid advantage of mutual backup and the specialties of each
Looking Ahead
In the next chapter, we will begin translating these functional/business requirements to technical policies Those policies, in turn, will be the basis for specific network design
TE AM FL Y
CHAPTER
Translating Service Definitions to Technical Requirements: Policies
Bad administration, to be sure, can destroy good policy; but good administration can never save bad policy Adlai Stevenson Advertising, in the final analysis, should be news If it is not news, it is worthless Adolph S Ochs The art of conversation is the art of hearing as well as being heard William Hazlitt
Policies are formalizations of business goals and services in support of business goals They bridge between business descriptions and the functional requirements for implementation discussed in subsequent chapters Two standards organizations, the ITU-Telecommunications sector (ITU-T) and the IETF, have been developing architectures that include policy Their objectives have been slightly different, although I find them quite nicely complementary The ITU Telecommunications Management Network (TMN) model, shown in Figure 41, starts with a top-down view of customer requirements and moves down in increasing detail until it deals with the configuration and control of specific network elements such as routers In contrast, the IETF POLICY working group concentrates on a means of collecting and distributing policy information without specific reference to the content of that informa-