This article explains the fundamentals of VXLAN, compares it with VLAN, and provides step‑by‑step Linux kernel and Open vSwitch implementations, including configuration commands, packet‑flow analysis, and practical testing to demonstrate overlay networking in cloud environments.
An award‑winning EuroSys 2024 paper introduces Hoda, a customized Open vSwitch dataplane that bridges the gap between diverse cloud forwarding tasks and generic designs, delivering up to 1.7× higher throughput and a 20 % reduction in Nginx request latency.
This article explains how modern data‑center virtualization is shifting from one‑to‑many to many‑to‑one VM models, then walks through the virtio and vhost‑net architectures, their kernel and user‑space components, and provides a step‑by‑step guide to set up a nested KVM environment with OVS for external network access.
VXLAN (Virtual eXtensible LAN) overcomes VLAN’s 12‑bit limitation by using 24‑bit VNIs, encapsulating Ethernet frames in UDP, and enabling large‑scale, multi‑tenant overlay networks; the article explains its principles, packet format, and provides step‑by‑step Linux kernel and Open vSwitch implementation examples with commands and flow‑table configurations.
This article explains VXLAN's role in cloud networking, details its 24‑bit VNI architecture, shows how Linux kernel and Open vSwitch implement VXLAN tunnels, and provides step‑by‑step command examples and flow‑table configurations to achieve overlay networking across multiple hosts.
This guide walks through Open vSwitch fundamentals, covering version and log management, controller and bridge configuration, flow table manipulation, VLAN, QoS, tunneling, sFlow, STP, port mirroring, aggregation, group and meter tables, and practical SDN application examples such as building virtual topologies and packet redirection.
This guide explains Open vSwitch's origins, core features, software architecture, key components such as ovsdb-server, ovs-vswitchd, and the kernel module, provides step‑by‑step installation on CentOS 7, and details configuration of bridges, ports, SSL, controllers, and flow handling for SDN environments.
This article presents a detailed, bank‑focused cloud‑native networking solution that leverages Kube-OVN's overlay/underlay dual‑stack architecture, OVS‑based performance, and security features to meet the high‑availability, high‑throughput, and regulatory demands of large financial institutions.
This article introduces Open vSwitch, compares it with Linux Bridge, details its features, provides step‑by‑step installation on CentOS 7, explains its architecture and packet‑forwarding process, and clarifies key components and terminology for building virtual networking in cloud environments.
This article, the second part of the “Open vSwitch Full Analysis” series, explains the structure and operation of OVS flow tables, detailing match fields, actions, priorities, timeouts, and provides practical ovs‑ofctl command examples for configuring flows, VLANs, and tunnels such as VXLAN and GRE.
This article demonstrates how to build flat, VLAN, and VXLAN networking topologies using Open vSwitch integrated with Docker containers, covering architecture concepts, required host configurations, step‑by‑step command sequences, and connectivity testing across single‑host and multi‑host environments.
The article reviews the NSDI 2015 OVS paper, explaining OVS’s architecture, the challenges of OpenFlow‑based software switching, and the cache‑centric performance optimizations such as Tuple Space Search, MicroFlow and MegaFlow caching, while also suggesting further engineering improvements.
This article examines the rapid adoption of 25G SmartNICs for cloud workloads, compares major vendor solutions, explains why an Open vSwitch‑based TC Flower offload design was chosen, and details the practical challenges and performance gains achieved when deploying the solution in a public‑cloud environment.
This guide walks through configuring kernel network parameters, installing required packages, setting up Keystone authentication, enabling the ML2 plugin, configuring Open vSwitch, linking Compute with Neutron, creating external and tenant networks, and deploying the OpenStack dashboard on an Icehouse cloud.
