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Computer Science - Communication Networks | The Complete IS-IS Routing Protocol

The Complete IS-IS Routing Protocol

Gredler, Hannes, Goralski, Walter

2005, XVII, 540 p.

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IS-IS has always been my favourite Interior Gateway Protocol. Its elegant simplicity, its well-structured data formats, its ?exibility and easy extensibility are all appealing – IS-IS epitomizes link-state routing. Whether for this reason or others, IS-IS is the IGP of choice in some of the world’s largest networks. Thus, if one is at all interested in routing, it is well worth the time and effort to learn IS-IS. However, it is hazardous to call any routing protocol “simple”. Every design decision, be it in architecture, implementation or deployment, has consequences, some unanti- pated, some unknowable, some dire. Interactions between different implementations, the dynamic nature of routing, and new protocol features all contribute to making routing protocols complex to design, write and deploy effectively in networks. For example, IS-IS started as a link-state routing protocol for ISO networks. It has since evolved sign- cantly: IS-IS has IPv4 and IPv6 (and IPX) addressing; IS-IS can carry information about multiple topologies; link attributes have expanded to include traf?c engineering para- ters; a new methodology for restarting IS-IS gracefully has been developed. IS-IS even has extensions for use in “non-packet networks”, such as SONET and optical networks, as part of the Generalized Multi-Protocol Label Switching (G-MPLS) protocol suite. Understanding all of what IS-IS offers and keeping abreast of the newer protocol f- tures is a weighty endeavour, but one that is absolutely essential for all serious netwo- ing engineers, whether they are developing code or running networks.

Content Level » Professional/practitioner

Keywords » Cisco - Communication Systems - Interface - Internet Protocol (IP) - Long-Term-Evolution - Multiprotocol Label Switching - Network programming - Network technologies - Router - Systems Architecture - Troubleshooting - architecture

Related subjects » Communication Networks - Hardware

Table of contents 

Introduction, Motivation, and Historical Background Router Architecture Introduction to the IOS and JUNOS Command Line Interface IS-IS Basics Neighbour discovery and handshaking Generating, Flooding, and Aging LSPs Pseudo-Nodes and Designated Routers Synchronizing Databases Fragmentation SPF and Route Calculation TLVs and sub-TLVs IP Reachability Information IS-IS Extensions Traffic Engineering and MPLS Troubleshooting Network Design Future of IS-IS

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