Unit 5 pptx which explains the concepts of the Network, Overlay, Concepts

Unit 5 pptx which explains the concepts of the Network, Overlay, Concepts

1. OVERLAY UNDERLAY CONCEPTS NETWORK

2. UNDERLAY NETWORK The underlay network is described by the physical devices and can be switches and routers in the network. All network components of the underlay must determine IP connectivity via the use of a routing protocol. The protocol used on the underlay devices are like OSPF(Open Shortest Path First), IS-IS (Intermediate System to Intermediate System), BGP(Border Gateway Protocol) for routing purposes.

3. NET-WORK OVER-LAYS

4. What are Network Overlays ? Network overlays are a method of using software virtualization to create addition layers of network abstraction ( or software based network overlays) that can be run on top of the physical network, often providing new applications or security benefits. They can take on many forms, including peer-to-peer networks, IP networks, and virtual Local Area Networks (vLANs). Over the years many different networking protocols have been developed to help build overlay networks to solve common problems.

5. VIRTUALIZATION Virtualization is basically consolidating all of these physical servers with their different operating systems and application and runnin them on just one physical server in a virtual environment. EMAIL WEB SERVER DATABASE Traditional way a business operates is by having one machine for one application. Here three different systems running 3 different operating systems performing different operations.

6. Many forms of Network Overlays and Protocols Some of the protocols developed for network overlay technology include Virtual Extensible LAN (VXLAN — IETF RFC 7348), Virtual Private Networks (VPNs), and IP Multicast. Software Defined Networking (SDN) has spawned even more overlay technologies those from individual vendors, the most well known of which is VMware’s NSX. Numerous overlay networks can run through the same underlay network to provision multitenancy through virtualization. Each overlay network performs as a Virtual Routing and Forwarding (VRF) instance for joining to external networks.

7. SO WHAT’S SDN ? SDN stands for software-defined networking Software-Defined Networking (SDN) is a network architecture approach that enables the network to be intelligently and centrally controlled, or ‘programmed,’ using software applications. This helps operators manage the entire network consistently and holistically, regardless of the underlying network technology. This model differs from that of traditional networks, which use dedicated hardware devices (i.e., routers and switches) to control network traffic. SDN can create and control a virtual network – or control a traditional hardware – via software.

8. Overlays and SDN Most forms of overlay use some sort of “encapsulation” – a software tag that wraps around the message before it is taken to its destination. When it gets to the destination, this encapsulated message is unwrapped and delivered to the destination it was intended for – typically some sort of network application.

9. Architecture of Software Defined Networks (SDN) Control Plane In Routing control plane refers to the all functions and processes that determine which path to use to send the packet or frame. In a single line it can be said that it is responsible for How packets should be forwarded. Data Plane In Routing data plane refers to all the functions and processes that forward packets/frames from one interface to another based on control plane logic. In single line it can be said that it is responsible for moving packets from source to destination. It is also called as Forwarding plane.

10. Architecture of Software Defined Networks (SDN) in SDN, the control plane and data plane are separate entities, where the control plane acts as a central controller for many data plane. Control Plane Centralized Controller Data Plane Data Plane Data Plane

11. The most important TOPIC

12. Thank you 🙏