[eBook Code] QOS-Enabled Networks (eBook Code, 2nd)

· 제목 : [eBook Code] QOS-Enabled Networks (eBook Code, 2nd) (Tools and Foundations)
· 분류 : 외국도서 > 기술공학 > 기술공학 > 텔레커뮤니케이션
· ISBN : 9781119109112
· 쪽수 : 256쪽
· 출판일 : 2015-12-21

About the Authors x

Foreword xi

Preface xiii

Acknowledgments xv

Abbreviations xvi

Part I THE QOS REALM 1

1 The QOS World 3

1.1 Operation and Signaling 4

1.2 Standards and Per?]Hop Behavior 5

1.3 Traffic Characterization 8

1.4 A Router without QOS 11

1.5 Conclusion 12

References 12

Further Reading 12

2 The QOS Tools 13

2.1 Classifiers and Classes of Service 13

2.2 Metering and Coloring—CIR/PIR Model 15

2.3 The Policer Tool 16

2.4 The Shaper Function 17

2.5 Comparing Policing and Shaping 18

2.6 Queue 19

2.7 The Scheduler 21

2.8 The Rewrite Tool 21

2.9 Example of Combining Tools 23

2.10 Delay and Jitter Insertion 27

2.11 Packet Loss 31

2.12 Conclusion 32

Reference 33

3 Challenges 34

3.1 Defining the Classes of Service 35

3.2 Classes of Service and Queues Mapping 37

3.3 Inherent Delay Factors 40

3.4 Congestion Points 46

3.5 Trust Borders 49

3.6 Granularity Levels 51

3.7 Control Traffic 53

3.8 Trust, Granularity, and Control Traffic 54

3.9 Conclusion 56

Further Reading 56

4 Special Traffic Types and Networks 57

4.1 Layer 4 Transport Protocols: UDP and TCP 58

4.1.1 The TCP Session 61

4.1.2 TCP Congestion Mechanism 64

4.1.3 TCP Congestion Scenario 65

4.1.4 TCP and QOS 66

4.2 Data Center 67

4.2.1 SAN Traffic 68

4.2.2 Lossless Ethernet Networks 69

4.2.3 Virtualization 71

4.2.4 Software Defined Networks 73

4.2.5 DC and QOS 74

4.3 Real?]Time Traffic 74

4.3.1 Control and Data Traffic 75

4.3.2 Voice over IP 76

4.3.3 IPTV 78

4.3.4 QOS and Real?]Time Traffic 79

Reference 80

Further Reading 80

Part II TOOLS 81

5 Classifiers 83

5.1 Packet QOS Markings 84

5.2 Inbound Interface Information 85

5.3 Deep Packet Inspection 87

5.4 Selecting Classifiers 88

5.5 The QOS Network Perspective 89

5.6 MPLS DiffServ?]TE 92

5.7 Mixing Different QOS Realms 94

5.8 Conclusion 99

References 100

6 Policing and Shaping 101

6.1 Token Buckets 101

6.2 Traffic Bursts 106

6.3 Dual?]Rate Token Buckets 109

6.4 Shapers and Leaky Buckets 110

6.5 Excess Traffic and Oversubscription 112

6.6 Comparing and Applying Policer and Shaper Tools 113

6.7 Conclusion 116

Reference 116

7 Queuing and Scheduling 117

7.1 Queuing and Scheduling Concepts 117

7.2 Packets and Cellification 119

7.3 Different Types of Queuing Disciplines 121

7.4 FIFO 121

7.5 FQ 123

7.6 PQ 125

7.7 WFQ 127

7.8 WRR 128

7.9 DWRR 131

7.10 PB?]DWRR 137

7.11 Conclusions about the Best Queuing Discipline 141

Further Reading 142

8 Advanced Queuing Topics 143

8.1 Hierarchical Scheduling 143

8.2 Queue Lengths and Buffer Size 146

8.3 Dynamically Sized versus Fixed?]Size Queue Buffers 149

8.4 RED 150

8.5 Using RED with TCP Sessions 152

8.6 Differentiating Traffic inside a Queue with WRED 154

8.7 Head versus Tail RED 156

8.8 Segmented and Interpolated RED Profiles 158

8.9 Conclusion 160

Reference 161

Further Reading 161

Part III CASE STUDIES 163

9 The VPLS Case Study 165

9.1 High?]Level Case Study Overview 166

9.2 Virtual Private Networks 167

9.3 Service Overview 168

9.4 Service Technical Implementation 170

9.5 Network Internals 171

9.6 Classes of Service and Queue Mapping 172

9.7 Classification and Trust Borders 174

9.8 Admission Control 175

9.9 Rewrite Rules 176

9.10 Absorbing Traffic Bursts at the Egress 179

9.11 Queues and Scheduling at Core?]Facing Interfaces 179

9.12 Queues and Scheduling at Customer?]Facing Interfaces 182

9.13 Tracing a Packet through the Network 183

9.14 Adding More Services 186

9.15 Multicast Traffic 188

9.16 Using Bandwidth Reservations 190

9.17 Conclusion 191

Further Reading 191

10 Case Study QOS in the Data Center 192

10.1 The New Traffic Model for Modern Data Centers 192

10.2 The Industry Consensus about Data Center Design 196

10.3 What Causes Congestion in the Data Center? 199

10.3.1 Oversubscription versus Microbursts 199

10.3.2 TCP Incast Problem 202

10.4 Conclusions 205

Further Reading 207

11 Case Study IP RAN and Mobile Backhaul QOS 208

11.1 Evolution from 2G to 4G 208

11.2 2G Network Components 209

11.3 Traffic on 2G Networks 211

11.4 3G Network Components 211

11.5 Traffic on 3G Networks 215

11.6 LTE Network Components 216

11.7 LTE Traffic Types 219

11.8 LTE Traffic Classes 220

11.9 Conclusion 224

References 227

Further Reading 227

12 Conclusion 228

Index 230