VRF, VLAN, VXLAN, LISP: Choosing the Right Segmentation Layer
By the time you have read this cluster, you have four different ways to segment a network: VRFs, VLANs, VXLAN,
Overlay Networking
Virtual topologies built on top of an existing IP network. Articles tagged Overlay Networking cover VXLAN, EVPN, LISP and the encapsulation choices behind each fabric.
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Hypervisors, Virtual Switches, and VMs for Network Engineers
A network engineer in 2026 spends a surprising amount of time on networks that have no physical cables. The server
SD-Access and the Traditional Campus: Interoperability and Migration
Nobody builds a greenfield campus. You have an existing network with real users, real applications, and real uptime requirements, and
Cisco SD-Access Architecture: Fabric, Control Plane, and Policy
SD-Access is Cisco's intent-based campus fabric, and it is where the two protocols from earlier in
VXLAN with BGP EVPN: The Control Plane Fabrics Actually Use
VXLAN gives you the data plane: a way to wrap Ethernet in UDP and route it across a fabric. But
VXLAN Deep Dive: VNIs, VTEPs, and the UDP Encapsulation
Every modern data centre fabric, and the campus fabric of SD-Access, is built on VXLAN. It is the technology
LISP Explained: Locator/ID Separation and Why Fabrics Use It
An IP address is doing two jobs at once, and that overload is the root of a surprising number of