Network Skills / CCNA 200-301 Tutorials / Spine-Leaf Architecture Tutorial

Spine-Leaf Architecture Tutorial

3 min read

Spine-leaf is a network topology widely used today in data centers and cloud environments, built for better scalability, high availability, and consistently low latency. Unlike the traditional three-tier hierarchy (core, distribution, and access layers), a spine-leaf fabric uses just two layers of switches: spine and leaf.

A router receiving a packet and deciding which interface to forward it out of based on its routing table
A router receiving a packet and deciding which interface to forward it out of based on its routing table
diagram of spine-leaf architecture, shown side by side with the three-tier diagram above for comparison

The spine layer is made up of switches that handle routing and act as the network’s core. The leaf layer is made up of access switches that connect to servers, storage, and other end devices. This two-layer design cuts down hop count, reduces latency, and avoids the bottlenecks that tend to show up in three-tier designs.

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