TAILIEUCHUNG - Cisco Network part 86

Tham khảo tài liệu 'cisco network part 86', công nghệ thông tin, quản trị mạng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | alternatives from two T1s between a single router at your site and a single router at the ISP to two T1 s between separate routers at your site to two different ISPs. For how to get the most out of BGP including load sharing and efficiency considerations my book only considers availability read Halabi s book. If none of the above makes sense to you hire a competent consultant to walk you through the alternatives and their tradeoffs. The O Reilly article follows by Vincent Jones 05 11 2001 Many organizations depend upon Internet connectivity to support critical applications. One popular approach for improving Internet connectivity is to connect to more than one Internet service provider ISP a technique called multihoming. Multi-homing can be very effective for ensuring continuous connectivity -eliminating the ISP as a single point of failure -- and it can be cost effective as well. However your multi-homing strategy must be carefully planned to ensure that you actually improve connectivity for your company not degrade it. THE CONCEPT OF PHYSICAL DIVERSITY First I want to discuss the network components that can affect overall connectivity. Because most network failures are due to problems in the WAN links it does little good to connect to a second ISP if both ISP links are carried over the same communications circuit. Even if independent circuits are used -- if they are not physically diverse they will still be subject to common failure events such as construction work inside your building or digging in the street outside. Providing complete physical diversity can be difficult and expensive but the requirement is not limited to ISP connections. All critical network links for internal communications should also be diversified. Assuming an otherwise well- designed internal network the easiest way to achieve physical diversity in your ISP connections is to connect from two different locations that are already well-connected to each other. But they must be far enough .

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