Networking

EVPN-VXLAN Underlay and Overlay Network

Network Design diagram · made in Skemio

Diagram showing IP underlay spine-leaf fabric carrying an encrypted VXLAN overlay tunnel between leaf VTEP switches to connect host VMs in VLAN 10.
Diagram showing IP underlay spine-leaf fabric carrying an encrypted VXLAN overlay tunnel between leaf VTEP switches to connect host VMs in VLAN 10.
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What it shows

  • Underlay network routes raw IP packets via OSPF/IS-IS/eBGP with ECMP.
  • VXLAN encapsulates L2 frames into UDP port 4789 packets across switches.
  • MP-BGP EVPN acts as control plane, replacing flood-and-learn with routing.

The takeaway

EVPN-VXLAN decouples tenant virtual networks from physical hardware, eliminating L2 scale limits.

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