---
title: "Network design"
description: "Network design reference for Calico Open Source covering layer-2 and layer-3 interconnect fabric options for the underlay network."
product: "Calico Open Source"
version: "3.32 (latest)"
section: "Reference"
canonical_url: "https://docs.tigera.io/calico/latest/reference/architecture/design/"
---

# Network design

## [📄️Calico over Ethernet fabrics](https://docs.tigera.io/calico/latest/reference/architecture/design/l2-interconnect-fabric.md)

[Reference for using Calico Open Source over a layer-2 Ethernet interconnect fabric covering BGP peering and broadcast domain considerations.](https://docs.tigera.io/calico/latest/reference/architecture/design/l2-interconnect-fabric.md)

## [📄️Calico over IP fabrics](https://docs.tigera.io/calico/latest/reference/architecture/design/l3-interconnect-fabric.md)

[Reference for using Calico Open Source over a layer-3 IP interconnect fabric covering BGP topology choices and route propagation.](https://docs.tigera.io/calico/latest/reference/architecture/design/l3-interconnect-fabric.md)