Basic BGP and the Customer Side of Exterior Routing in VS .NET

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Looking Ahead
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Once you learn to work with attributes, you can create intelligent multihoming The next levels go into transit networking, first with full iBGP meshes ( 10) and then with scalable iBGP using confederations or route reflectors ( 11) 10 will also discuss customer multihoming strategies in which the proper solution involves both internal changes to the customer network and provider actions Such strategies include mutual backup among multiple enterprises
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CHAPTER
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Subscriber to Provider, and Subscriber to Subscriber Edge: IP
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Ferguson s Law of Engineering: No amount of magic knobs will save a sloppily designed network Paul Ferguson 186,000 miles per second It s not just a good idea It s the law Seen on a button
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In this chapter we are primarily concerned with getting user traffic into your POPs and with considerations regarding the placement of POPs We will touch on some design and optimization techniques for POPs, but not the interconnections of your POPs by your intraprovider core or your connections to other providers The provider also will need management communications to run its own services, and perhaps the closely related functions of outsourced customer management and web hosting or other value-added services Let s say you are a local provider filling a niche in a remote area It is not a poverty-stricken area by any means, but simply far from major cities Due to low labor costs, you have some enterprise customers of substantial size You also support an assortment of residential and small business customers, including a few information-intensive teleworkers Your community has local information resources, including a junior college and an endowed political think tank Telco patterns and geography dictate that you will need to concentrate access into several points of presence The focus of this chapter is designing the POPs and associated capabilities There will be significant discussion about protecting your infrastructure from customer errors or malicious attacks from the customer side
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10
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9 presented the customer side of the edge interface Subsequent chapters will examine your intraprovider core and your connections to other providers But what do your customers need Their needs fall into several categories: 1 Residential and SOHO customers needing single IP addresses 2 SOHO customers with single subnets 3 Enterprise customers with basic access requirements for single or multiple prefixes 4 Enterprise and other customers with high-availability requirements, potentially including small ISPs Let s start the process with the most basic kind of user and the first step in provisioning that user taking the service order and converting it into a checklist of technical steps to be carried out We will then examine the process for more complex user types
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Taking Orders
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Orders originate in sales, and describe some form of user visible service dialup low-speed access, Internet connectivity for a single LAN, Internet and VPN connectivity for a complex enterprise, and so forth You will need to make sure that a physical or virtual connection exists between the user and an appropriate POP(s) You must ensure that ports on routers or other devices in the POP are available and allocated to the user To make a profit, and to avoid destruction, your accounting and security services must recognize the user and deny invalid users For value-added services such as content caching, you must provision the desired higher-layer services
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A COMMON CUSTOMER MISUNDERSTANDING It is unfortunately common for customers to complain that they don t see full routes at a point where they expect to do so There can be many good reasons they do not, and they do not understand because they do not understand the theory and practice of BGP First, as part of the loop prevention design of BGP, a BGP router only passes on the routes it is actually using The route the customer expects to see may indeed be known to a BGP speaker in your AS and available as a backup route, but may not be passed along to customer routers because it is not in active use This is completely correct behavior Second, the routes the customer is expecting may be present implicitly as parts of aggregates
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