LAN/WAN and Router Basics - TMCnet

Demystifying Quality of Service (QoS) What Is Quality of Service? Ability of a network to provide improved service to selected network traffic over various underlying technologies Provides improved and more predictable network service by: Supporting dedicated bandwidth Improving loss characteristics Avoiding and managing network congestion

Shaping and policing network traffic Setting traffic priorities across the network Page 2 Introduction to QoS Where the data traffic (LAN or WAN) on a network is subject to scrutiny and control Primarily an IP/Layer 3 concept Relevant at Layer 2 within the Ethernet environment and also within the WAN technologies such as Frame Relay and ATM

Driving factors: growth of multimedia traffic (voice and video) and traditional data traffic Page 3 Reasons for QoS The introduction of real-time delay sensitive applications such as VoIP and video over the Wide Area Network (WAN) Shortage of bandwidth because network links are oversubscribed

Packets being lost due to congestion during bursty periods End-to-end delay made up by a number of factors Page 4 Why the Need for QoS? WAN access is a pinch-point in the network 100Mbps: 1Mbps speed difference is typical Lack of QoS results in unacceptable delay, jitter, loss

Protect your reputation QoS reduces call-backs due to poor voice quality VoIP users expect toll-quality phone service Poor performance = service calls, lost customers Page 5 Functions of QoS QoS needs to enable:

Page 6 Predictable response times Management of delay sensitive applications Management of jitter sensitive applications

Control of packet loss when congestion occurs during a burst Setting of traffic priorities Dedication of bandwidth on a per application basis Avoidance of congestion The management of congestion when it occurs Need for QoS Support Surging data applications can block voice calls Delays of less than 1/6-second can impact call quality Varying delay (jitter) degrades quality even with no loss

Typical network without a QoS solution Page 7 Affect of QoS Prioritization Used to prioritize Voice over IP traffic Email and data traffic share remaining traffic Typical network with a QoS solution Page 8 Clear the Traffic Jam in Your Network

No QoS: Critical traffic excessively delayed With QoS: Critical traffic gets Express Lane Multi-lane prioritization for options Page 9 The BIG Gotcha with QoS!! What is in the Cloud? Local access types

T1 leased lines? Point-to-point or to a service providers data network? Cable local loops? Local cable segment congestion? Service provider network? Can THEY support QoS? Service Level Agreement (SLA) support The Big I Internet? Inherently does not support QoS end-to-end QoS is only as reliable as the weakest

element in a network! Page 10 Thank You! Page 11

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