Overlay Networking

By the time you have read this cluster, you have four different ways to segment a network: VRFs, VLANs, VXLAN,

A network engineer in 2026 spends a surprising amount of time on networks that have no physical cables. The server

Nobody builds a greenfield campus. You have an existing network with real users, real applications, and real uptime requirements, and

SD-Access is Cisco's intent-based campus fabric, and it is where the two protocols from earlier in

VXLAN gives you the data plane: a way to wrap Ethernet in UDP and route it across a fabric. But

Every modern data centre fabric, and the campus fabric of SD-Access, is built on VXLAN. It is the technology