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IS-IS Network Design Solutions by Scott Sturgess, Abe Martey

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Foreword

With the Internet continuing to expand, the need for robust and flexible IP routing protocols to sustain the expansive global routing system can never be overemphasized. Of all the IP routing protocols that evolved alongside the Internet, only three of them survived the test of time and are currently widely deployed: BGP for exterior routing, and OSPF and IS-IS for interior routing.

The IS-IS Protocol has emerged as one of the universally adopted and widely used Interior Gateway Protocols, besides OSPF. BGP remains the de facto Exterior Gateway Protocol for interdomain routing. IS-IS is used as an IGP by most of the Tier 1 and Tier 2 Internet service providers for both practical and historical reasons. The wisdom and insight of the original ...

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