Reliable IP Networking the Real Definition

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Executive Summary

Network reliability, today this means a network operator purchases and maintains duplicate equipment and over provisions links in an attempt to create a reliable and stable network. This paper will present techniques suitable for next generation networks, where reliability must not come at the cost of network profitability. Due to the inherent limitations of legacy equipment, operators have been forced to implement redundant and layered routing architectures that are not only complicated and unreliable, but are also no longer economically viable. Typical large IP networks only achieve 3 to 4 9s reliability, which translates into 50-260 minutes of downtime per year. Also router vendors further negotiate "Planned Outages" windows to incorporate maintenance and upgrade cycles of their products.

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