Tim Gregory’s EVPN Examples

Tim Gregory has some great, simple examples of EVPN on Juniper routers. All of his examples use MX routers and EX4200 switches.

The four examples below highlight the simplicity of EVPN and how it addresses the shortcomings of VPLS in the Data Center Interconnect (DCI) role with an open standard.

Here’s some of the benefits of EVPN over other legacy and/or proprietary DCI technologies:

  1. Flexible Data Plane options
    • VxLAN or MPLS
  2. All-Active Forwarding
    • Scale up and out your connections between data centers with additional routers and connections; No wasted connections
  3. Control Plane Learning for Mac Addresses
    • Eliminates flooding of BUM traffic / improve Learning / eliminates loops
    • Fast convergence; usually sub-second mac address adds, withdrawals, and moves
    • Faster reconvergence when a Virtual Machine moves
  4. Combined L2 and L3 Services
    • Eliminate the trombone effect for layer 3
      • Distributed L3 gateway for Virtual Machine Traffic Optimization (VMTO)
    • Supports Integrated Routing & Bridging natively
  5. Open standards interoperability;
    • Juniper, Cisco, and others support it

Here’s the links for Tim Gregory’s articles:

EVPN – The Basics

EVPN Inter-VLAN routing and Mobility

EVPN All Active Multihoming

EVPN Single Active Redundancy

Later, when I get a chance, I’m going to post some modified examples of these configurations running running fully virtualized on VMWare vSphere just using Juniper vMXs.

Using vMX free trial licenses allow you to build a lab around EVPN for free and test it out.