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Cloud Native Data Center Networking by Dinesh G. Dutt

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Chapter 17. Deploying Network Virtualization

The unavoidable price of reliability is simplicity

Tony Hoare

In this chapter, we explore administration of the different network virtualization solutions described in earlier chapters. Specifically, we’ll examine the configuration of overlay virtual networks. Ethernet Virtual Private Network (EVPN), covered in Chapter 16, is assumed to be the control protocol, and VXLAN is the encapsulation protocol. Configuration OSPF and BGP for Virtual Routing and Forwarding (VRF) was covered in “Support for VRFs” and “BGP and VRFs”, respectively.

The key questions addressed by this chapter include:

  • How do I configure EVPN bridging and routing in my network?/

  • How do I configure the key routing protocols (eBGP, iBGP, and OSPF) for network virtualization?

The Configuration Scenarios

EVPN provides a few configuration choices, especially the choice of routing protocol in the underlay and the handling of multi-destination frames. To this end, I’ll cover the following three high-level configurations:

  • Single eBGP Session for underlay and overlay

  • OSPF for underlay, iBGP for overlay with ingress replication

  • OSPF for underlay, iBGP for overlay with routed multicast underlay

The configurations for the underlay have been laid out in the previous chapters and so I won’t be discussing them further here, especially OSPF’s. Besides this, we also have non-control protocol configuration such as creating vxlan VNIs, mapping VNIs to VLANs, and so on. ...

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