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Ethernet VPN (EVPN) has recently been gaining support among companies looking to solve problems in the design of data center networks. This mature technology has been a part of service provider networks for years, but data center network architects and operators have to contend with complex concepts and terminology spread across multiple standards documents to piece together the relevant model for their data center. This practical ebook cuts through the fog to explain how you can deploy this technology in the core of your data center. By guiding you through EVPN concepts and practicalities, author Dinesh Dutt (BGP in the Data Center) illustrates why this technology is the piece you need to successfully adopt VXLAN in your Clos-based network. You’ll also discover why EVPN can be simpler to use in data centers than in service provider networks. Understand network virtualization overlays (NVO) and network tunneling Learn the constructs that Border Gateway Protocol (BGP) provides to support NVOs Understand how bridging works in EVPN networks, including the behavior with dual-attached hosts Examine different routing models with EVPN Inspect the most common deployment scenarios in EVPN configuration and put them to use in other situations

Acknowledgments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v 1. Introduction to EVPN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Software Used in This Book 4 2. Network Virtualization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 What Is Network Virtualization? 5 Network Tunneling 9 VXLAN 13 Protocols to Implement the Control Plane 15 Support for Network Virtualization Technologies 16 Summary 18 3. The Building Blocks of Ethernet VPN. . . . . . . . . . . . . . . . . . . . . . . . . . 19 A Brief History of EVPN 20 Architecture and Protocols for Traditional EVPN Deployment 21 EVPN in the Data Center 22 BGP Constructs for Virtual Networks 24 Modifications to Support EVPN over eBGP 30 FRR Support for EVPN 31 Summary 32 4. Bridging with Ethernet VPN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 An Overview of Traditional Bridging 33 Overview of Bridging with EVPN 35 Support for Dual-Attached Hosts 47 iiiARP/ND Suppression 53 Summary 54 5. Routing with Ethernet VPN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 The Case for Routing in EVPN 55 Routing Models 56 Where Is the Routing Performed? 58 How Routing Works in EVPN 61 Vendor Support for EVPN Routing 72 Summary 72 6. Configuring and Administering Ethernet VPN. . . . . . . . . . . . . . . . . . . 73 The Sample Topology 74 Configuration Cases 76 The End First: Complete FRR Configurations 78 Dissecting the Configuration 85 Examining an EVPN Network 92 Comparing FRR and Cisco EVPN Configurations 94 Considerations for Deploying EVPN in Large Networks 95 Summary 9

Dinesh G. Dutt has been in the networking industry for the past 20 years, most of it at Cisco Systems. Most recently, he was the chie scientist at Cumulus Networks. Before that, he was a fellow at Cisco Systems. He has been involved in enterprise and data center net working technologies, including the design of many of the ASIC that powered Cisco’s mega-switches such as Cat6K and the Nexu family of switches. He also has experience in storage networking from his days at Andiamo Systems and in the design of FCoE. He i a coauthor of TRILL and VxLAN and has filed for over 40 patents.

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