December 2015
Intermediate to advanced
920 pages
23h 28m
English
Content preview from MPLS in the SDN Era
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Chapter 1. Introduction to MPLS and SDN
This chapter introduces the basic Multiprotocol Label Switching (MPLS) and Software-Defined Networking (SDN) concepts. These technologies were born for a reason, and a very good way to put them in the proper context is to understand their history. For example, although MPLS has countless applications and use cases today, it was originally conceived to solve a very specific problem in the Internet.
The Internet
The Internet is a collection of autonomous systems (ASs). Each AS is a network operated by a single organization and has routing connections to one or more neighboring ASs.
AS numbers ranging from 64512 to 65534 are reserved for private use. Although the examples in this book use AS numbers from this range, in real life, Internet Service Providers (ISPs) use public AS numbers to peer with their neighboring ASs.
Traditionally, AS numbers were 16 bits (2-byte) long, but newer protocol implementations support AS numbers that are 32 bits (4-byte) in length, too.
Figure 1-1 provides a very simplified view of the Internet. Here, we’re going to take a look at Annika, a random Internet user. She lives in Europe, has a wireline Internet connection at home, and works in a big enterprise that is also connected to the Internet. The company that employs Annika happens to have its own AS number (65001)—this is not a requirement for corporate Internet access. Coincidentally, this company is connected to the Internet through the same ISP (AS 65000) ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.