Chapter 21



In the last chapter, we looked at how we can use MPLS to create a Layer 2 VPN (L2VPN) for a Virtual Private LAN Service (VPLS). In this chapter, we’ll extend those concepts and explore how Ethernet VPNs (EVPNs) and Virtual Extensible LANs (VXLANs) expand the capabilities of Layer 2 services like a bridge-switch network over a Layer 3 infrastructure consisting of IP routers.

We’ll start with an overview of the service EVPNs provide, and then compare Layer 2 VPNs with EVPNs. We’ll examine the multi-protocol EVPN control plane (MPBGP) and the types of route advertisements used. Then we’ll look at underlays and overlays and how they can be confusing.

We’ll end with a look at how VXLANs can form the data plane for ...

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