Case Study3: Design Scenario Klamath Paper Products

Name: Fabio M. Cesar Professor: Edwin Otto Course: Network Architecture and Analysis Date: 12/04/2012 Many routing protocols are based on algorithms designed to obtain the shortest path between two points, disregarding metrics such as delay and congestion. However, the demand for speed and bandwidth on this environment is causing the depletion of resources available in the current network’s infrastructure. The users are constantly seeking larger applications, causing congestion and degradation of performance. Therefore, the goal is that the network support the various services and user’s requirements effectively by the techniques of Quality of Service (QoS). The Internet service is based on end-to-end without connection, which provides transport of best-effort data by using TCP / IP (Transmission Control Protocol / Internet Protocol).
The QoS functions are expected to guarantee delivery and to differentiate IP services to network resources and for controlling the operation of the network. QoS is a set of service requirements that must be known by the network in the “Flow of Transportation” guaranteeing the service for the end-to-end, based on policy measured on performance, resource allocation, switching, routing, routing of packets and packet loss mechanisms. With the use of QoS in IP, networks can support the existing applications and emerging applications - such as multimedia, plus the new applications such as Voice over IP (VoIP), which require specific levels of QoS network.
A network can provide three levels of QoS:
• Best-effort service, also known as "no QoS ". Best effort service is basic connectivity with no guarantees.
• Differentiated Service, also called soft QoS, differentiation makes provision for traffic prioritization. Some types of traffic are handled better than others. There are no guarantees for this type of service.
• Guaranteed service, also called hard QoS It has an absolute reservation of network resources for specific traffic. The decision of which type of service is appropriate depends on a network of several factors, among them the resources that the application requires. To provide guaranteed QoS, the requirements must be defined so the applications can run with quality. Some of the requirements most used are:
• Bandwidth / Flow - Effective rate of data transfer;
• Losses - Network capacity to deliver the data correctly;
• Jitter - Variation of the delay;
• Delay (Latency) - Time spent by packets to go from source to destination

Applications must always flow (bandwidth) and, therefore, this parameter is the most basic and most certainly present in specifications, this QoS parameter of quality of service is usually considered during design phase and deployment of the network. A good definition of this requirement is vital for proper operation of any application. The term "bandwidth" is used to describe the ability of data transfer in a unit of time. It can be said that it is the "width of the pipe" required for the application to communicate over the network. Generally, a connection with service guarantees requires certain minimum bandwidth of the network to another. Is exemplified, a voice application produces a digitized stream of 64 kbps. This application becomes almost impractical to along the path there is a linkage with less than 64 kbps. However, it is necessary a more detailed study before opting for bandwidth requirements, both must be mapped to the actual need of requirements to provide network Quality of Service.
The fact is that the volume of traffic combined with the services currently available need to be controlled in view of their classification and prioritization traffic as the primary purpose for which the network is intended, in order to reach best performance in networks. Thus, more services can be aggregated to the network and consequently more dependent processes will become more and the company will be swift.

|Applications vs. QoS Parameter Sensitivity | | |
| | | | | |
|Type of Traffic |Flow |Losses |Latency |Jitter |
|Voice |very high |high |average |low |
|Ecommerce |Low |High |Low |High |
|Transaction |Low |High |High |Low |
|Mail |Low |High |High |Low |
|Remote Acess (telnet) |Low |High |Medium |Low |
|Casual Web Browsing |Low |Medium |Medium |Low |
|Browsing Web Critique |Medium |High |High |Low |
|File Transfer |High |Medium |Low |Low |
|Video Cnferencing |High |Medium |High |High |
|Multicast |High |High |High |High |

At the end of the file transfer [pic]

The Picture below shows the limit of the link on the Bandwidth and its utilization for each transfer. The beginning of the transfer is done manually because of that, the transfer has a better performance initially. [pic]

REFERENCE

http://www.cisco.com/en/US/products/ps6558/products_ios_technology_home.html http://www.studymode.com/subjects/design-a-plan-to-integrate-the-different-routing-protocols-into-a-new-network-design-for-genome4u's-lab-page1.html http://www.voip-info.org/wiki/view/QoS

http://www.dd-wrt.com/wiki/index.php/Quality_of_Service

http://vonage.nmhoy.net/qos.html
http://www.coolnerds.com/Newbies/Bandwidth/Bandwidth.htm