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

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Chapter 4. Addressing in Integrated IS-IS

This chapter focuses on network addressing concepts in Integrated IS-IS and attempts to demystify the seemingly cumbersome CLNP network addressing, which is mandatory on IP routers, even when using Integrated IS-IS in IP-only environments. As discussed in Chapter 3, “Integrated IS-IS Routing Protocol Concepts,” Integrated IS-IS retains most of the concepts of the original IS-IS routing protocol, as specified in ISO 10589, and defines new TLVs (RFC 1195) that enable support for IP routing. The CLNP node-based addressing scheme is one of the key concepts retained in Integrated IS-IS. The node-based addressing scheme requires only a single address for the entire node. In contrast however, link-based addressing ...

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