Virtualized Network System Models: SDN vs PBNM

This is a critical examination of two virtualization networking approaches that advises management that in a dilemma over what approach to consider between SDN and PBNM. It compares the two in terms of infrastructure and capabilities and answers questions about what constitutes each network model, what processes and approaches are involved in management of network system in each, and what impacts and benefits can the enterprise leverage from each model. Presentation comes amid fears of possible loss of data control.

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Virtualized Network
System Models

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Executive Summary
This is a critical examination of two virtualization networking approaches
advises management that in a dilemma over what approach to consider between SDN and
PBNM
answers the questions:
a) What really is and constitute each of the network model?
b) What processes and approaches are involved in management of network system in each?
c) What impacts and benefits can the enterprise leverage from each model?
Compares the two in terms of infrastructure and capabilities
Presentation comes amid fears of possible loss of data control.

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Table of Contents
1. Executive Summary
2. Software-Define Network
3. Policy Based Network Management
4. Capabilities & Infrastructural Needs
5. Recommendations
6. References

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Introduction
Tech domain innovations have created a digital society.
Everything is connected and/or accessible by a click of a button.
Experienced shift from traditional network model to modern day network systems.
Traditional ones have been hard to manage, due to poor policy and static computing features.

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Virtualized Network System Models
1) Software-Defined Network Model
2) Policy-Based Network Management Model
3) Capabilities
4) Recommendations

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Software-Define Network
Definition
Processes and approaches
Benefits
Impacts

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SDN- Definition
A networking paradigm whose features of cost-effectiveness, manageability, dynamism and
adaptability make it an ideal solution for dynamic high-bandwidth network applications.
Characterized by:
i. abstraction of network logic from hardware implementation into software,
ii. a network controller that coordinates forwarding of decisions made by the networking devices
iii. separation of network forwarding and control planes

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SDN- Processes and Approach
SDN controllers
offer a centralized view of the network
Allows control of underlying network devices
Dictates how traffic is forwarded in the network system..
API- Application Programmable Interface
Uses Southbound API to relay information between routers and switches.
Northbound API help network administrators shape by use of programming techniques, network
traffic and services they deploy.

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SDN-Benefits
The network is simple to use, less prone to error since it’s not easy to modify the configured/set
policies using software applications.
Automated response to changes thus keeping high level policies in place.
Localization of the controller makes the whole process of designing even more sophisticated
networks and network functions possible.

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SDN-IMPACTS
increased revenue generation and value gain from the network.
Flexibility and agility: organizations deploy services, applications and infrastructure so as to meet
the ever changing business demands, goals and objectives.
SDN processes could be programmed and reprogrammed as deems fit,
Centralized management
Performance- networks optimize on resource utilization, traffic engineering and bandwidth
management, capacity optimization, robustness and high utilization.
Service integration: efficient and effective load balancing, intrusion detection system
SDN are transforming the remote relationship between computer networks and information
technology.

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Policy Based Network
Management
Definition
Approach and Processes
Benefits
Impacts

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PBNM-Definition
networking paradigm in which rules that govern the behavior of the network are separated from
the functionality
has been used in different architectures and paradigms. E.g. SLA-driven, autonomous, adaptive,
business-driven and self-managed systems
A policy refers to a criterion that is used to determine actions that can be executed in a network
system, and in accordance with predefined

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PBNM-Approach and Process
The policy Management Tool acts as the server, hosting the policy management application..
The Policy Information Repository stores all information related to policy information..
PEP is a network that is used to enforce policies made in the PDP.

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PBNM-Benefits
•Relieves system administrators of the burden of managing complex computer applications
•Policies used are developed by the, management and are long-lasting and illustrative in nature.
•Enhances automation of most business processes of establishing management-level objectives
•Adapt to changes in the management’s requirements.
•The model is the best solution for large networks whose operational directives are subject to
frequent changes.

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PBNM-Impacts
Simplifies the overall duty of managing network together with its connected devices and
services.
Requires less IT personnel and engineers to work on it.
offers great flexibility to meet dynamic needs of the business processes and state
Resource allocation is managed by use of policies that are defined and distributed among
system devices and the network.

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Capabilities & Infrastructural
Needs
SDN require infrastructure to
 automate control,
 provide centralized network resources allocation,
multi-tenancy support infrastructure, network monitoring and maintenance, optimization equipment,
equipment to increase traffic speed,
and to integrate Ethernet by applying SDN principles and telecommunications technologies.
PBNM infrastructure requirement is dependent on policies defined and network system
implementation.

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Capabilities & Infrastructural
Needs (SDN)
Provides centralized networking capabilities,
There is holistic enterprise’s network management, more granular security, lower operational
costs.
The model offers a guarantee of content delivery, with reduced downtime, isolation and traffic
control and centralized as well as extensibility of the network system

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Capabilities & Infrastructural
Needs (PBNM)
This is a client-based paradigm that offers improved network traffic management through
distributed architecture, deployed configuration, better policy agent, end point policy
enforcements, effective policy server and remote network system administration.
Additionally, the model provides for effective and efficient network resources usage, plus
stateful traffic inspection and network congestion management.

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Recommendations
SDN help organization manage network traffic efficiently,
But have security issues since the protocols and infrastructure have not yet effected tighter
security control mechanisms to protect the content and privileges assigned to the network
resources.
PBM offer benefits in terms of regulations of the provisions of the resources in the network and
the end users. This translates to easier migrations to new network architectures

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Recommendations
Recommend PBNM due to:
greater benefits in terms of regulations of the provisions of the resources in the network and the end
users
unique end-user needs are justified and traffic control automated.
Enhanced security.

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References
Antonis, M. H., Marinos, C. & George, P., 2007. A policy-based approach for managing
ubiquitous networks in urban spaces. s.l., Centre for Communication Systems Research.
Arthur, C., 2013. SDN and Legacy Network Infrastructure. [Online]
Available at: http://www.enterprisenetworkingplanet.com/datacenter/sdn-and-legacy-network-
infrastructure.html
[Accessed 05 June 2018].
Carlos, A. A. & Oscar, J. C., n.d. Policy Creation Model for Policy-Based Management in
Telecommunications Networks. [Online]
Available at: https://arxiv.org/ftp/arxiv/papers/1108/1108.0716.pdf

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The End Thank you.