Advanced QoS for Multi–Service IP/MPLS Networks

Advanced QoS for Multi–Service IP/MPLS Networks is the definitive guide to Quality of Service (QoS), with comprehensive information about its features and benefits. Find a solid theoretical and practical overview of how QoS can be implemented to reach the business objectives defined for an IP/MPLS network. Topics include standard QoS models for IP/MPLS networks, essential QoS features, forwarding classes and queuing priorities, buffer management, multipoint shared queuing, hierarchical scheduling, and rate limiting. This book will enable you to create a solid QoS architecture/design, which is mandatory for prioritizing services throughout the network.

Table of Contents:
Introduction xxv Part 1 Fundamentals of IP/MPLS QoS Chapter 1 The Need for Quality of Service 3 1.1 The Changing Service Delivery Landscape 4 1.2 What Is Quality of Service? 5 1.3 Alcatel–Lucent Service Router Portfolio 6 1.4 Network Service Restrictions and Service Level Agreements 11 Summary 15 Chapter 2 QoS Models And Network Convergence 17 2.1 The Integrated Services QoS Model 18 2.2 The Differentiated Services QoS Model 20 Summary 27 Chapter 3 Understanding Type of Service Markings 29 3.1 The IP Header ToS Field 30 3.2 DiffServ Per–Hop Behaviors 37 3.3 Ethernet Frame Formats and the 802.1p ToS Field 40 3.4 MPLS Shim Header and EXP Field 44 Summary 46 Chapter 4 Fundamental QoS Features 47 4.1 Traffic Classification 48 4.2 Queuing and Buffer Management 50 4.3 Scheduling 51 4.4 Rate–Limiting 52 4.5 Filtering 54 Summary 55 Part 2 ALSRP QoS Features Chapter 5 ALSRP Architecture and Quality of Service Implementation 59 5.1 An Overview of ALSRP s Generic Architecture 60 5.2 The IOM Layout and Fast–path Complexes 62 5.3 The QoS Features Enforcement Sequence 64 5.4 Network Demarcation Points 66 5.5 End–to–End Traffic Management in an ALSRP Network 69 Summary 72 Chapter 6 Network Traffic Classification 75 6.1 End–to–End Traffic Mapping and Marking 77 6.2 Forwarding Classes and Queuing Priorities in ALSRP 80 6.3 Profile States of Datagrams and Queues 81 6.4 SAP–Ingress Policy and Traffic Mapping at Access Ingress 83 6.5 Applying the SAP–Ingress Policy 100 6.6 Network QoS Policy 102 6.7 Applying Network QoS Policy 110 6.8 SAP–Egress Policy and Traffic Marking at Access Egress 111 6.9 Applying a SAP–Egress Policy 113 6.10 Verification Commands for QoS Policy Application 115 Summary 117 Chapter 7 Advanced Traffic Classification 119 7.1 Forwarding Subclasses 120 7.2 Color–Aware Profiling 122 7.3 Honoring the Three Drop Precedence of Assured Forwarding PHB 124 7.4 Access Ingress Marking of IP Packets 125 7.5 The Trust Nature of Interfaces and Network Egress Marking 128 7.6 Selecting a ToS Field in QinQ Encapsulated Frames 132 7.7 Tunnel Termination QoS Override 139 Summary 141 Chapter 8 Queuing and Buffer Management 143 8.1 Understanding Buffer Partitions 144 8.2 Buffer–Related Queue Parameters 152 8.3 Configuring Access Queues and Queue Mapping 155 8.4 Network–Queue Policy 162 8.5 Applying a Network–Queue Policy 166 8.6 Buffer Management 171 8.7 Slope Policy 180 8.8 Applying Slope Policy 182 8.9 Verification Commands for Buffer Management 184 Summary 190 Chapter 9 Hardware Queue Enabling Options at Access Ingress 193 9.1 Configuring the Scaling Options 194 9.2 An Example for Comparing the Scaling Options 196 9.3 Service Queuing 198 9.4 Shared Queuing 201 9.5 Multipoint Shared Queuing 206 9.6 Comparing the Scaling Options 210 9.7 Verification Commands Associated with the Scaling Options 210 Summary 217 Chapter 10 Scheduling 219 10.1 Scheduling–Related Queue Parameters 220 10.2 Scheduling Modes 225 10.3 Nodal Scheduling: Putting It All Together 231 10.4 Configuring Scheduling Parameters of Access Queues 233 10.5 Configuring Scheduling Parameters of Network Queues 235 10.6 Verification Commands for Scheduling 238 Summary 247 Chapter 11 Hierarchical Scheduling 249 11.1 Hierarchical Scheduling Parameters 251 11.2 Virtual Scheduler Bandwidth Distribution 252 11.3 Examples of Virtual Scheduler Bandwidth Distribution 254 11.4 Creating and Configuring a Scheduler Policy 263 11.5 Applying a Scheduler Policy 267 11.6 Verification Commands for Hierarchical Scheduling 276 Summary 287 Chapter 12 Traffic Rate–Limiting 289 12.1 Policing Network Traffic 291 12.2 Rendering Traffic Conforming by Using Shaping 298 12.3 Shapeless Policing 299 12.4 Traffic Rate–Limiting: Putting It All Together 300 Summary 302 Chapter 13 Special Topics 303 13.1 Link Aggregation Group and QoS Adaptation 304 13.2 Link Fragmentation and Interleaving 310 13.3 QoS Policy Overrides 313 13.4 Service Assurance Agent 318 13.5 Time–Based QoS 338 Summary 356 Part 3 Designing Quality of Service Chapter 14 QoS Design Principles and Service Requirements 361 14.1 Understanding QoS Design Principles 362 14.2 Service Requirements of Common Application Traffic 366 14.3 QoS Design Approach: A Case Study 372 Summary 392 Chapter 15 Hierarchical Scheduling Design A Case Study 395 15.1 Case Study Details 396 15.2 Design Requirements 398 15.3 Basic Configuration 399 15.4 Design Option 1: Basic Scheduling 400 15.5 Design Option 2: Single–Tier Virtual Hierarchical Scheduling 402 15.6 Design Option 3: Two–Tier Virtual Hierarchical Scheduling 404 Summary 407 Glossary 409 Index 417