November 2005
Intermediate to advanced
480 pages
13h 38m
English
Content preview from OSPF and IS-IS: Choosing an IGP for Large-Scale NetworksBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Afterword: The Future of Link State Protocols
OSPF and IS-IS are both almost 20 years old, and are based on a mathematical algorithm that is almost 50 years old; in Internet years, this is nearly prehistoric. They were designed in the days when processors were slow, memory was expensive, and each router added significant latency to the network. As a result both protocols have features and characteristics that no longer matter, meant to solve problems that no longer exist. The 32-bit alignment of all OSPF data units for orderly processing and the original 6-bit IS-IS metric for faster processing are just two examples. Although the operational experience gained from the original link state protocol used in the ARPANET led to some key design differences ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.