Arista EVPN VXLAN Configuration Example (1a) - Overview

I am starting a series of blogs on the Arista EVPN Vxlan configuration and will cover the following topics:

• Underlay/Overlay BGP Configuration (No IGP involved)
• L2 EVPN vs L3
• L2 VLAN-based vs L2 VLAN-aware
• Symmetric and asymmetric routing
• Single-homing and multi-homing
• Multi-homing: MLAG vs EVPN active/active
• 2 major Arista platforms: Jericho and Trident families
• Router reflector and router server
• Inter-VPN solution
• EVPN inter VRF route leak
• Some other advanced features
• Dynamic BGP peering

Pre-requisites: 2 things need to be taken care of before EVPN configuration:

• BGP multi-agent mode, EVPN is ONLY supported with this mode
• service routing protocols model multi-agent
• And need to reboot device to make this effective
• Hardware setup:
• For Trident 2 (7050*X), Tomahawk (7060*X) family devices like , recirculation must be enabled
• For Arad (7280E, 7500E)/Jericho (7280R*, 7500R*) series device, select vxlan-routing TCAM profile

List of reference:

• EVPN Deployment Guide
• Deploying EVPN Multihoming in Data Center Networks  
• https://eos.arista.com/category/evpn/
• EVPN VXLAN Design Guide
• Arista EOS manual - EVPN chapter
• Multi-Tenant EVPN VXLAN IRB Configuration & Verification Guide (eBGP Overlay & Underlay)
• EVPN configuration – An eBGP EVPN over eBGP network design
• Virtual IPs in Vxlan and need for vVTEP
• TOIs:
• 4.24.0F: EVPN Transit Route VRF Leaking
• 4.24.0F: RACL on inner IP fields for VXLAN decapsulated packets
• 4.23.2F: EVPN Centralized Anycast Gateway
• 4.22.0F: EVPN VxLAN IPV6 Overlay
• 4.20.1F: EVPN IRB with Vxlan Underlay
• 4.18.0F: VXLAN Routing on 7280E, 7500R and 7280R Platforms
• 4.15.2F: VXLAN Routing
• Arista BGP EVPN - Configuration Example @ Overlaid

What's the difference between this series of blog and the above official documents?

• Configuration and trouble-shooting focused, no theory. The above links did a good job on the theory explanation, so I don't need to waste time and effort here. 
• Simplest topology and step by step configuration
• Starting with 2 single-homing VTEPs + 1 Spine + RR
• L2 EVPN (vlan-based, vlan-bundle-aware) and L3 EVPN
• 2 dual-homing VTEPs by MLAG or EVPN A/A
• IPv4/v6 overlay
• Adding 1 Spine for ECMP and RS
• Only necessary and user-input configuration (no BGP max routes or link speed)
• Hardware and scale information and consideration
• Convergence/switchover time