Deploying IP QoS for Multiservice Networks : Theory and Practice - John Evans

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Deploying IP QoS for Multiservice Networks

Theory and Practice

By: John Evans

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Paperback | 9 March 2007

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456 Pages

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QoS, short for "quality of service, is one of the most important goals a network designer or administrator will have. Ensuring that the network runs at optimal precision with data remaining accurate, traveling fast, and to the correct user are the main objectives of QoS. The various media that fly across the network including voice, video, and data have different idiosyncrasies that try the dimensions of the network. This malleable network architecture poses an always moving potential problem for the network professional.

The authors have provided a comprehensive treatise on this subject. They have included topics such as traffic engineering, capacity planning, and admission control. This book provides real world case studies of QoS in multiservice networks. These case studies remove the mystery behind QoS by illustrating the how, what, and why of implementing QoS within networks. Readers will be able to learn from the successes and failures of these actual working designs and configurations.

Helps readers understand concepts of IP QoS by presenting clear descriptions of QoS components, architectures, and protocols
Directs readers in the design and deployment of IP QoS networks through fully explained examples of actual working designs
Contains real life case studies which focus on implementation

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Preface	p. xiii
Acknowledgments	p. xxi
About the authors	p. xxiii
QOS Requirements and Service Level Agreements	p. 1
Introduction	p. 1
SLA Metrics	p. 4
Network Delay	p. 4
Propagation Delay	p. 5
Switching Delay	p. 6
Scheduling Delay	p. 6
Serialization Delay	p. 6
Delay-jitter	p. 8
Packet Loss	p. 9
Bandwidth and Throughput	p. 12
Layer 2 Overheads	p. 13
VPN Hose and Pipe Models	p. 16
Per Flow Sequence Preservation	p. 18
Availability	p. 20
Network Availability	p. 20
Service Availability	p. 21
Quality of Experience	p. 22
Voice	p. 23
Video	p. 24
On-line Gaming	p. 24
Application SLA Requirements	p. 24
Voice over IP	p. 26
VoIP: Impact of Delay	p. 29
VoIP: Impact of Delay-jitter	p. 31
VoIP: Impact of Loss	p. 33
VoIP: Impact of Throughput	p. 36
VoIP: Impact of Packet Re-ordering	p. 37
Video	p. 38
Video Streaming	p. 38
Video Conferencing	p. 57
Data Applications	p. 58
Throughput Focussed TCP Applications	p. 59
Interactive Data Applications	p. 70
On-line Gaming	p. 74
Marketed SLAs versus Engineered SLAs	p. 16
End-to-End SLAs vs Segmented SLAs	p. 77
Inter-provider SLAs	p. 77
Intserv and Diffserv SLAs	p. 78
References	p. 79
Introduction to QOS Mechanics and Architectures	p. 87
What is Quality of Service?	p. 87
Quality of Service vs Class of Service or Type of Service?	p. 88
Best-effort Service	p. 89
The Timeframes that Matter for QOS	p. 90
Why IP QOS?	p. 91
The QOS Toolset	p. 91
Data Plane QOS Mechanisms	p. 94
Classification	p. 94
Implicit Classification	p. 95
Complex Classification	p. 95
Deep Packet Inspection/Stateful Inspection	p. 96
Simple Classification	p. 96
Marking	p. 99
Policing and Metering	p. 100
RFC 2697: Single Rate Three Color Marker	p. 102
RFC 2698: Two Rate Three Color Marker	p. 106
Color-aware Policers	p. 108
Metering	p. 111
Queuing, Scheduling, Shaping, and Dropping	p. 112
Queuing and Scheduling	p. 112
Dropping	p. 128
Shaping	p. 137
Link Fragmentation and Interleaving	p. 140
IP QOS Architectures	p. 141
A Short History of IP Quality of Service	p. 141
Type of Service/IP Precedence	p. 142
IP Precedence	p. 144
Type of Service	p. 145
IPv6 Traffic Class Octet	p. 147
Integrated Services Architecture	p. 147
Differentiated Services Architecture	p. 147
DS Field	p. 150
Per-Hop Behaviors	p. 154
Per-Domain Behaviors	p. 159
Explicit Congestion Notification	p. 160
Diffserv Tunneling Models	p. 165
IPv6 QOS Architectures	p. 170
MPLS QOS Architectures	p. 171
MPLS and Intserv/RSVP	p. 172
MPLS and Diffserv	p. 173
IP Multicast and QOS	p. 181
Typical Router QOS Implementations in Practice	p. 183
Layer 2 QOS	p. 189
ATM	p. 190
Mapping Diffserv to ATM QOS	p. 193
Frame-relay	p. 194
Ethernet	p. 196
Complementary Technologies	p. 197
Where QOS cannot make a difference	p. 198
References	p. 199
Precedence, TOS, and DSCP Conversion	p. 204
Notation	p. 204
Conversion	p. 205
Deploying Diffserv	p. 209
Introduction	p. 209
Deploying Diffserv at the Network Edge	p. 211
Why is the Edge Key for Tight SLA Services?	p. 211
Edge Diffserv Case Study	p. 212
SLA Specification	p. 212
Diffserv Meta-Language	p. 218
High-speed Edge Design	p. 218
Design Variations	p. 225
Edge SLA Summary	p. 241
How Many Classes are Enough?	p. 241
What Marking Scheme to Use?	p. 244
VoIP - How Much is Enough at the Edge?	p. 245
Deploying Diffserv in the Network Backbone	p. 249
Is Diffserv Needed in the Backbone?	p. 249
Core Case Study	p. 253
Core Classes of Service and SLA Specification	p. 253
"Prioritized" Diffserv Core Model	p. 254
Detailed Core Design	p. 256
Design Variations	p. 261
Core-marking Scheme	p. 263
Tuning (W)RED	p. 268
Tuning the Exponential Weighting Constant	p. 269
Tuning Minth and Maxth	p. 270
Mark Probability Denominator	p. 271
In- and Out-of-contract	p. 271
References	p. 272
Capacity Admission Control	p. 275
Introduction	p. 275
When is Admission Control Needed?	p. 277
A Taxonomy for Admission Control	p. 282
What Information is Needed for Admission Control?	p. 285
Parameterized or Measurements-based Algorithms	p. 286
Parameterized Algorithms	p. 286
Measurement-based Algorithms	p. 288
Topology-unaware Off-path CAC	p. 290
Topology-aware Off-path CAC: "Bandwidth Manager"	p. 292
Example Bandwidth Manager Method of Operation: Next Generation Network Voice CAC	p. 294
The Integrated Services Architecture/RSVP	p. 303
RSVP	p. 304
RSVP Example Reservation Setup	p. 307
Application Signaling Interaction	p. 314
Intserv over Diffserv	p. 316
RSVP Aggregation	p. 320
RSVP Traffic Engineering	p. 325
NSIS	p. 326
End-system Measurement-based Admission Control	p. 328
Summary	p. 329
References	p. 330
SLA and Network Monitoring	p. 335
Introduction	p. 335
Passive Network Monitoring	p. 336
How Often to Poll?	p. 337
Per-link Statistics	p. 337
Monitoring Classification	p. 338
Monitoring Policing	p. 339
Monitoring Queuing and Dropping	p. 342
System Monitoring	p. 346
Core Traffic Matrix	p. 347
Active Network Monitoring	p. 348
Test Stream Parameters	p. 349
Packet Size	p. 350
Sampling Strategy	p. 351
Test Rate	p. 354
Test Duration and Frequency	p. 355
Protocols, Ports, and Applications	p. 357
Active Measurement Metrics	p. 358
Delay	p. 358
Delay-jitter	p. 360
Packet Loss	p. 362
Bandwidth and Throughput	p. 363
Re-ordering	p. 363
Availability	p. 363
Quality of Experience	p. 364
Deployment Considerations	p. 364
External versus Embedded Agents	p. 364
Active Monitoring Topologies	p. 365
Measuring Equal Cost Multiple Paths	p. 369
Clock Synchronization	p. 370
References	p. 371
Core Capacity Planning and Traffic Engineering	p. 375
Core Network Capacity Planning	p. 375
Capacity Planning Methodology	p. 376
Collecting the Traffic Demand Matrices	p. 377
Determine Appropriate Over-provisioning Factors	p. 382
Simulation and Analysis	p. 388
IP Traffic Engineering	p. 389
The Problem	p. 390
IGP Metric-based Traffic Engineering	p. 394
MPLS Traffic Engineering	p. 397
MPLS TE Example Tunnel Establishment	p. 397
Diffserv-aware MPLS Traffic Engineering	p. 404
MPLS TE Deployment Models and Considerations	p. 408
Setting Tunnel Bandwidth	p. 412
References	p. 414
Index	p. 419
Table of Contents provided by Ingram. All Rights Reserved.

Deploying IP QoS for Multiservice Networks

Theory and Practice

At a Glance

Paperback

Shipping

How to return your order

Defective items

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