DEVELOPMENT OF A MODIFIED EAST-WEST INTERFACE FOR DISTRIBUTED CONTROL PLANE IN SOFTWARE DEFINED NETWORK FOR WIDE AREA NETWORKS
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DEVELOPMENT OF A MODIFIED EAST-WEST INTERFACE FOR DISTRIBUTED CONTROL PLANE IN SOFTWARE DEFINED NETWORK FOR WIDE AREA NETWORKS
Chapter One: Introduction 1.1 Background of Research
Computer networks rely on network devices like routers and switches to deliver data. These network devices require protocols and policies to communicate effectively (Nunes et al. 2014).
Traditional networks confront numerous challenges (Chen et al., 2015), including the implementation of high-level network policies and the manual configuration of each network device using low-level configuration commands while taking into account network conditions.
There is also a need for dynamic network settings (fault tolerance, load changes, automatic reconfiguration, and response mechanisms), which makes it difficult to enforce essential network policies (Kreutz et al. 2015).
In addition to the rising complexity of network equipment, traditional networks, or legacy networks, are vertically integrated (Kreutz et al., 2015). The control plane and data plane are integrated into networking equipment, limiting innovation and network flexibility.
Another obstacle given by traditional networks is “Internet ossification,” or the difficulties of evolving the Internet in terms of physical infrastructures, protocols, and performance (Nunes et al., 2014).
Emerging Internet applications and services are becoming more complicated and demanding, and the Internet must change to meet these difficulties (Nunes et al., 2014).
Software defined networking (SDN) is a new networking paradigm that tackles existing network limits by simplifying network management while allowing for innovation and development (Kreutz et al., 2015). SDN separates the control and data planes.
The control plane chooses how to manage traffic, while the data plane forwards traffic based on the control plane’s decisions (Feamster et al., 2013). SDN has sparked intense interest in both industry and academics (Jarraya et al., 2014).
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It moves the intelligence from traditional network devices to a centralised control layer, allowing network programming. SDN is now envisioned for multi-datacenter scenarios, such as B4 (Jain et al., 2013) and WANs.
This can only be accomplished by distributing the SDN control plane. A distributed control plane is required to address single points of failure (SPOF), making SDN architecture extremely sensitive to assaults (Kreutz et al., 2013). It also handles issues of scalability and performance in huge networks.
The distributed control plane uses numerous controllers and is classified as conceptually centralised or logically dispersed (Blial et al., 2016). The logically centralised control plane balances controller charges and unifies decisions through a shared database.
However, it necessitates substantial synchronisation between controllers and is not appropriate for big, highly distributed networks. The logically distributed control plane (logically distributed controllers) is appropriate for large dispersed networks, with each controller managing its domain and disseminating data to other controllers.
This category is primarily used in large data centres and WAN networks that suffer from high costs and latency due to the complexity of the infrastructure and protocols that handle traffic, such as the border gateway protocol (BGP) and multi-protocol label switching (MPLS) (Benamrane et al., 2017).
In a logically dispersed SDN architecture (e.g., WAN), communication between several controllers is critical (Benamrane et al., 2017). The East-West Interface (or API) facilitates communication between controllers on the control plane.
There is currently no East-West Interface standard (Jarraya et al. 2014). Existing research on the East-West interface ignores numerous aspects of a genuine WAN, such as varied network regulations and high availability.
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1.2 The Significance of Research
Networks and network technology have evolved over time, necessitating effective and efficient network administration for all types of networks (small, medium, and big). This network management must be dependable, scalable, and offer fine-grained performance.
This necessitates the development of SDN for WAN, which includes forwarding, distribution, and specification abstractions. This development will make network communication more simple, scalable, cost-effective, efficient, and secure.
The purpose of this research is to ensure WAN communication with various policies through policy updates and high availability, hence supporting the growth of SD-WAN. Previous studies did not take into account the persistent high availability of controllers for East-West communication.
1.3 Statement of Problem
The logically distributed architecture control plane addresses the issue of scalability in big networks like WANs by providing an East-West interface for communication between these networks.
The East-West Interface must enable scalability by allowing controllers in a WAN network to communicate efficiently and effectively while taking into account the WAN’s real-time features.
As a result, there is a requirement for an interface that prioritises high availability for policy updates and decision making, as well as ensuring communication among WANs with diverse rules. The goal of this research is to create a redesigned East-West interface for WANs that incorporates high controller availability.
1.4 Aims and Objectives
The goal of this study is to create a modified East-West interface for the distributed control plane in Software Defined Network (SDN) for Wide Area Networks (WANs).
To attain this goal, the following objectives were established:
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1. Emulation of the network environment on a virtual machine (VM) running Ubuntu 16.04 LTS is required for implementing Benamrane et al.’s 2017 East-West communication interface for distributed control plane (CIDC).
2. Creation of an enhanced East-West interface based on the network emulated in (1) known as the “Modified-CIDC” (mCIDC) to connect the various WANs and network regulations.
3. Performance metrics for the mCIDC with CIDC include captured TCP packets, TCP errors, and inter-controller communication overload (ICO).
1.5 Scope of the Study
The research study investigates the use of the same controller over many WAN networks.
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