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NETWORK VIRTUALIZATION M13 - Coggle Diagram
NETWORK VIRTUALIZATION M13
VIRTUALIZATION
Cloud Computing and Virtualization
Virtualization is the foundation of cloud computing. Without it, cloud computing, as it is most-widely implemented, would not be possible. IT separates the operating system (OS) from the hardware.
DEDICATED SERVERS
These servers wasted energy and took up more space than was warranted by the amount of service provided. This is known as server sprawl.
SERVER VIRTUALIZATION
Server virtualization takes advantage of idle resources and consolidates the number of required servers. This also allows for multiple operating systems to exist on a single hardware platform.
Hypervisor OS Installation
The hypervisor is a program, firmware, or hardware that adds an abstraction layer on top of the physical hardware. The abstraction layer is used to create virtual machines which have access to all the hardware of the physical machine such as CPUs, memory, disk controllers, and NICs.
ADVANTAGES OF VIRTUALIZATION
Less equipment is required
Less energy is consumed
Less space is required
ABSTRACTION LAYERS
A computer system consists of the following abstraction layers
SOFTWARE-DEFINED NETWORKING
Network Virtualization Technologies
Two major network architectures have been developed to support network virtualization:
Software-Defined Networking (SDN) Cisco * Application Centric Infrastructure (ACI)
Traditional and SDN Architectures
In a traditional router or switch architecture, the control plane and data plane functions occur in the same device.
type 1 Hypervisors
Virtual Network Infrastructure
Type 1 Hypervisors
Type 1 hypervisors are also called the “bare metal” approach because the hypervisor is installed directly on the hardware. Type 1 hypervisors are usually used on enterprise servers and data center networking devices.
Installing a VM on a Hypervisor
Type 1 hypervisor is installed, and the server is rebooted, only basic information is displayed, such as the OS version, the amount of RAM, and the IP address. An OS instance cannot be created from this screen. Type 1 hypervisors require a “management console” to manage the hypervisor.
CONTROLLERS
SDN Controller and Operations
The SDN controller defines the data flows between the centralized control plane and the data planes on individual routers and switches.