implementing cisco quality of service qos

Ngày tải lên: 04/07/2014, 01:20

... eg. ToS field of IP o Problem l how to avoid everybody sendinghigh priority packets? Queue Management 1 Quality of Service in IP Networks CH-1015 Ecublens http://icawww.epfl.ch Prof. Jean-Yves ... Fast Retransmit o Probability p of choosing a given flow is proportional to the rate of the flow l more packets of that flow, higher probability of choosing one of its packets Queue Management 16 FIFO o ... assurance for QOS o Work in Progress includes Differentiated Services, and Integrated Services (RSVP) o Simple model for sharing and congestion studies: Queue Management 24 RED o Estimation of the...

Ngày tải lên: 06/04/2013, 11:05

... information instead of when a packet arrives. The 140 Chapter 9. Quality of Service Quality of service (QoS) is an often-used and misused term that has a variety of meanings. In this book, QoS refers ... functions to achieve the best QoS possible. Cisco offers many tools for implementing QoS. In some scenarios, you can use none of these QoS tools and still achieve the QoS you need for your applications. ... both edge QoS and backbone QoS must work together to achieve the proper QoS for the various applications which might be traversing a network. Before implementing QoS on the edge of a network,...

Ngày tải lên: 30/09/2013, 05:20

Ngày tải lên: 18/10/2013, 12:15

... or more of the total number of RF channels required on a multiple link transport system for a specified amount of user grade of service. The percentage reduction depended on the number of radiating ... 5 A N N! B= i i! i=0 N A ∑ Improving Grade of Service (GOS) While Reducing RF Channels Wireless service providers are adopting new deployment strategies to reduce network costs and improve quality of service. In one urban ... “grade of service (GOS), which is the acceptable amount of network blocking of incoming call attempts. Typical wireless network designs in the United States provision channels to provide voice services...

Ngày tải lên: 10/12/2013, 19:15

... Service Signaling Quality of Service Signaling © 2000, Cisco Systems, Inc. www .cisco. com econ_0386_09_001.ppt Copyright © 2000, Cisco Systems, Inc. 40 © 2000, Cisco Systems, Inc. www .cisco. com econ_0386_09_010.ppt Keep ... configuring Layer 2 QoS in switches that are capable of doing QoS, see the following URL: http://www .cisco. com/univercd/cc/td/doc/product/lan/cat6000/sw_5_2/cofigide /qos. htm Copyright © 2000, Cisco Systems, ... the service policy named gary. http://www .cisco. com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120xe/120xe5/mqc/mcli.htm Copyright © 2000, Cisco Systems, Inc. 44 Quality of Service Signaling Quality...

Ngày tải lên: 11/12/2013, 14:15

... significance of Quality of Service (QoS) • Describe new Quality of Service (QoS) features in Cisco IOS 12.1 • Explain which problems QoS solves The purpose of this module is to quickly survey the new Quality ... Inc. 1 © 2000, Cisco Systems, Inc. Introduction to Quality of Service Introduction to Quality of Service Copyright © 2000, Cisco Systems, Inc. 20 © 2000, Cisco Systems, Inc. www .cisco. com Econ_0385_02_010.ppt Keep ... significance of QoS • Describe new QoS features in Cisco IOS 12.1 • Explain which problems they solve Internal Cisco links on QoS: See: http://wwwin-people .cisco. com/emar /qos. html http://wwwin-emea .cisco. com/FieldInfo/Consult/Tech/Core /QOS/ fol17487/S1.htm Copyright...

Ngày tải lên: 11/12/2013, 14:15

... differentiator in achieving QoS. © 2000, Cisco Systems, Inc. 1 © 2000, Cisco Systems, Inc. Campus Quality of Service © 2000, Cisco Systems, Inc. 17 © 2000, Cisco Systems, Inc. www .cisco. com econ_387_05_010.ppt Campus ... Differential Service Code Point The objective of this module is to define the quality of service (QoS) tools which must be implemented to provide a voice-enabled transport service for IP telephony. A QoS- enabled ... achieved end-to-end QoS. © 2000, Cisco Systems, Inc. 6 © 2000, Cisco Systems, Inc. www .cisco. com econ_387_05_010.ppt Steps for Campus QoS Steps for Campus QoS 2 Steps for Campus QoS Implementation •...

Ngày tải lên: 11/12/2013, 14:15

... avoidance, additive increase 24.23 24-5 QUALITY OF SERVICE 24-5 QUALITY OF SERVICE Quality of service (QoS) is an internetworking issue Quality of service (QoS) is an internetworking issue that ... provide quality of Two models have been designed to provide quality of service in the Internet: Integrated Services and service in the Internet: Integrated Services and Differentiated Services. ... Four cases of congestion 24.2 24-1 DATA TRAFFIC 24-1 DATA TRAFFIC The main focus of congestion control and quality of The main focus of congestion control and quality of service is service is...

Ngày tải lên: 06/03/2014, 12:20

... 105 5.9 References 106 6 Quality of service 107 6.1 Introduction 107 6.2 Routing in mobile ad hoc networks 110 6.3 Routing with quality of service constraints 112 6.4 Quality of service routing in ... associated with providing quality of service (QoS) in ad hoc networks. It should be pointed out that security and quality of service are two distinct attributes that are independent of each other in general. ... potential sources of service impairment in ad hoc networks and hence may degrade the ‘ quality of service ’ seen by the users. As of now, the Internet has only supported ‘‘best effort’’ service – best...

Ngày tải lên: 25/03/2014, 12:07

... rate; PBOA: Progressive Backoff Algorithm; PHY: physical layer; QoS: quality of service; SINR: signal-to- interference-and-noise-ratio. Author details 1 Institute of Communication Networks, Technische ... assess and compare the QoS of both schemes by means of exten- sive system simulations in terms of data throughput as well as delay. However, we also consider the fairness of both schemes as an ... 2011, 2011:9 http://jwcn.eurasipjournals.com/content/2011/1/9 Page 7 of 13 RESEARCH Open Access Quality of service implications of power control and multiuser detection-based cross-layer design Ulrike...

Ngày tải lên: 21/06/2014, 03:20

... dequeued and the value of the (DC_i) is decremented by L_i. The algorithm is flexible enough as it allows provision of quantum of different sizes depending on the QoS requirements of the SSs. However, ... associated with a service class. The IEEE 802.16 standards define five service classes: Unsolicited Grant Service (UGS), extended real-time Polling Service (ertPS), real-time Polling Service (rtPS), ... Section Quality of Service and Resource Allocation in WiMAX 4 3. Then, the performance evaluation of these algorithms is made. Section 5 presents a synthesis table of the main scheduling...

Ngày tải lên: 21/06/2014, 05:20

... perform scheduling services, so that the QoS requirements of the connections can be satisfied. 3.1 What is QoS? QoS refers to the ability of a network to provide improved service to selected ... of a cellular WiMAX network where a number of base stations need to communicate simultaneously with their respective active users 1 . Each of these u sers has typically a certain Quality of Service ... wireless-based access methods. 3.2 QoS and scheduling in WiMAX A high level of QoS and scheduling support is one of the interesting features of the WiMAX standard. These service- provider features are...

Ngày tải lên: 21/06/2014, 05:20

... analysis of the network in the limit of large number of users.Theaimof this approach is to obtain op timal values of the resuse factor that no longer depend on the particular configuration of the ... IEEE802.11e enhancement (IEEE802.16e, 2006), that allows the quality- of- service management. Service and performance metric. The main objective of this chapter is to derive and compare the performance ... the knowledge of t he signal -quality, the amount of users, the scheduling policy, etc. This entails that in the case of UE initiated connections, the UE has a complete knowledge of the expected...

Ngày tải lên: 21/06/2014, 05:20

... defines a concept of a service flow. A service flow is a unidirectional flow of packets with a particular set of QoS parameters and is identified by a service flow identifier (SFID). The QoS parameters could ... format of the OFDMA slot is 8 data subcarriers of 6 OFDM symbols. The total number of OFDMA slots in a mobile WiMAX frame corresponds to S × T s where S = L d 8 and T s is the number of OFDM symbol ... satisfy QoS constraints of each connection. The mapping mechanism is left to the choice of the provider. 3. State of the art 3.1 Bandwidth sharing strategies: background To maintain a quality of service...

Ngày tải lên: 21/06/2014, 05:20

... studying the impact of different parameters on the performance of contention-based services of IEEE 802.16. We evaluate the impact of the number of SSs (N) and the initial backoff window (W)on various ... PMP mode. In WiMAX networks, quality of service (QoS) is provided through five different services classes in the MAC layer (Andrews et al., 2007): 1. Unsolicited grant service (UGS) is designed for ... traffic load of an SS, ρ. In the following, we will develop the outer set of fixed point equations for ρ. 3.2 Mean service time of an REQ This subsection presents the details of Block B of Fig. 2,...

Ngày tải lên: 21/06/2014, 05:20

... providers. With regard to Quality of Service (QoS) control, the WiMAX system provides service differentiation based on the combination of a set of communication service classes supported by ... “http://www.tkn.tu-berlin.de/research/evalvid/” Quality of Service and Resource Allocation in WiMAX 200 After the process of classification has been completed,, the most complex aspect of the provision of QoS to individual ... reduction in the quality of the video. Figure 13 compares the number of frames received for each situation. Fig. 13. Number of Decoded Frames As well as the QoS analysis of the handover...

Ngày tải lên: 21/06/2014, 05:20

Ngày tải lên: 21/06/2014, 05:20

Ngày tải lên: 21/06/2014, 05:20

Ngày tải lên: 21/06/2014, 05:20