Description: A distributed switch is an essential component in virtualized network infrastructure, especially in environments using virtualization technologies. This type of switch allows centralized network management across multiple hosts, facilitating the efficient and scalable management of network connections for virtual machines (VMs). Unlike traditional virtual switches, which operate in isolation on each host, the distributed switch provides a unified and coherent view of the network, simplifying configuration and monitoring. Key features include the ability to apply network policies centrally, integration with security tools, and real-time performance tracking of the network. This not only enhances operational efficiency but also allows for greater flexibility in managing network resources, adapting to the changing needs of applications and services running in the virtual infrastructure. In summary, the distributed switch is a key tool for optimizing connectivity and performance in virtualization environments, enabling organizations to maximize their investments in virtualization technology.
History: The concept of a distributed switch was introduced with the arrival of VMware vSphere 5.0 in 2011. This version marked a milestone in network virtualization, allowing administrators to manage virtual networks more efficiently and centrally. Over the years, this technology has continued to evolve, incorporating additional features such as integration with software-defined networking solutions.
Uses: Distributed switches are primarily used in virtualization environments to centrally manage the connectivity of virtual machines. They allow for consistent network policy application across multiple hosts, facilitating the implementation of complex network configurations and security management. They are also useful for monitoring network performance and troubleshooting, as they provide a unified view of the virtual network infrastructure.
Examples: A practical example of using a distributed switch is in a data center running virtualization technology to host multiple virtual machines. By implementing a distributed switch, the administrator can configure network policies, such as Quality of Service (QoS) and security, that are automatically applied to all VMs across different hosts, simplifying management and improving operational efficiency.
