BGP EVPN & VXLAN Explained – Spine-Leaf Data Center Fabric in 5 Minutes

How does a modern data centre move its data? This animated explainer walks through BGP EVPN and VXLAN in a spine-leaf fabric, step by step: from the classic three-tier network to the eBGP underlay, VXLAN encapsulation, and the EVPN control plane. The example fabric is a multi-vendor lab with two spines and two leaves (Arista cEOS and Juniper vJunos-switch), using real AS numbers, loopbacks and VNIs. What you will learn: • Why spine-leaf replaced core/distribution/access, and why every path is exactly two hops • The eBGP underlay: one AS per leaf, shared spine AS, loopback reachability and ECMP • VXLAN encapsulation header by header: VNI, UDP 4789, outer IP, 50 bytes overhead, jumbo frames • How the UDP source port spreads flows across all spines • Why flood-and-learn does not scale • EVPN route type 2 (MAC/IP), type 3 (VTEP discovery) and type 5 (IP prefixes) • ARP suppression and the distributed anycast gateway with an L3 VNI Chapters: 0:00 Introduction 0:08 The old model 0:30 Spine-leaf 0:52 Underlay: eBGP 1:27 Layer 2 over layer 3? 1:49 VXLAN encapsulation 2:36 Across the fabric 3:02 Flood and learn 3:26 EVPN route type 2 4:01 Type 3 and ARP suppression 4:26 Anycast gateway 4:52 Three layers Narration: synthetic voice generated with Kokoro TTS (Kokoro-82M, voice "bm_george", Apache 2.0). Arista, Juniper, Apstra and CloudVision are trademarks of their respective owners; this video is not affiliated with or endorsed by them. #networking #vxlan #evpn #bgp #datacenter #networkengineering #spineleaf #juniper #arista #jncia