August 2016
Intermediate to advanced
268 pages
6h 5m
English
Content preview from Juniper QFX10000 Series
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Chapter 6. Ethernet VPN
Ethernet VPN (EVPN) has solved three interesting challenges in networking. The first is providing better L2VPN connectivity in the WAN. The second is providing an agnostic control plane to handle various data-plane encapsulations for overlay networks. The third is creating a standards-based multitenant network for hosting providers.
EVPN is powerful because it combines both Layer 2 and Layer 3 advertisements into a single Border Gateway Protocol (BGP) family. People are constantly coming up with ideas on how to use EVPN to make their networks more efficient and easier to use.
The Need for EVPN
Do we really need yet another VPN? Are existing VPNs not sufficient? These are the questions that many network engineers ask when discovering and evaluating new technology. Let’s walk through each of the problem statements in more detail.
Data Center Interconnect
Traditionally L3VPN and VPLS have been used in the WAN to provide Data Center Interconnect (DCI). However, when it came to L2VPNs, Virtual Private LAN Service (VPLS) provided the core functionality, but with a lot of drawbacks:
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No active-active multihoming
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No control plane or ability to create routing policies
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Inefficient flooding for MAC discovery and advertisements
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No intersubnet forwarding
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Limited MAC mobility and asymmetric traffic flows
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No advanced Ethernet Services
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No choice in data-plane encapsulation
Limitations aside, VPLS is still a widely used technology in the WAN because it ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.