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Welcome to Day One


This book is part of the Day One library, produced and published by Juniper Networks Books. Day One books cover the Junos OS and Juniper Networks network administration with straight forward explanations, step-by-step instructions, and practical examples that are easy to follow.

Key Multicast Resources

The Juniper TechLibrary supports multicast technologies with its excellent documentation. It is thorough and kept up-to-date with the latest technologies and changes. This book is no substitute for that body of information. The authors assume that you have familiarity with the Multicast Protocols Feature Guide: multicast/config-guide-multicast.html.

An excellent source of information for how to deploy EVPN-VXLAN in a data center environment is Day One: Using Ethernet VPNS For Data Center Interconnect, available at

Another excellent source of information on EVPN technology is This Week: Data Center Deployment With EVPN/VXLAN, available at

What You Need to Know Before Reading This Book

  • You need a basic understanding of Junos and the Junos CLI, including configuration changes using edit mode. See the Day One books at for a variety of books at all skill levels.

  • You need a basic understanding of multicast and multicast protocols such as PIM, IGMP, etc.

  • You should have some experience with EVPN and VXLAN technologies.

  • This book assumes that you have a basic understanding of networking and will be able to configure and troubleshoot IP Addressing, unicast, and multicast routing and switching.

  • The book has configuration sections and details about the verification of multicast in EVPN-VXLAN environment. It is highly recommended to find a lab with Junos routers to practice on.

After Reading This Book You Will Learn

After reading this book you will:

  • Understand how multicast works in an EVPN-VXLAN Fabric.

  • Understand how multicast traffic is routed from one VLAN to the other.

  • Understand Assisted Replication (AR)and how it helps improve resource utilization and link-utilization.

  • How to appreciate the optimization on access-side interfaces with IGMP-Snooping.

  • How to appreciate the optimization in EVPN core using Selective (SMET) Forwarding.

  • How to appreciate the optimizations used in conjunction with a large-scale EVPN multicast deployment with Inter-VLAN and External Multicast.

  • Configure and troubleshoot optimized Intra-VLAN & Inter-VLAN Multicast.

  • Configure and troubleshoot the devices to work with External Multicast Source/Receiver sitting outside the EVPN Fabric.

  • Configure and Troubleshoot a EVPN-VXLAN Fabric with multicast optimization enabled with Assisted-Replication.

How This Book Is Set Up

This book gives a quick background on multicast, PIM, and EVPN technologies in Part I. It is intended as more of a refresher and a very high-level primer.

Part II, delves into EVPN BUM and multicast forwarding rules within a VLAN and the problems of flooding everywhere. Various optimization procedures are discussed in a staged manner with Assisted Replication and Selective (SMET) Forwarding. Procedures are described in solving problems in multihoming, the cornerstone of EVPN. The benefits are illustrated quantitatively with examples to describe what the various optimizations bring to the table.

In Part III, the reader is taken through Inter-VLAN Multicast routing procedures riding on PIM as the protocol. It also explains how the optimizations introduced in Part II play a significant role in reducing bandwidth and resource consumption. Lastly, various nuances and procedures for multicast are described in relation to connecting the DC Fabric to the external world.