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                      The Complete IS-IS Routing Protocol
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                              General Information
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Type.................: E-Book
More Info............: springer.com




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                                 Release Notes
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Author: Gredler, Hannes

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.



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