xii
DSCP-to-CoS Mapping 296
Policed DSCP Mark-Down Mapping 297
Policing 300
Microflow and Aggregate Policers 300
Single-Rate Policing 302
Two-Rate Policing 310
Congestion Management and Congestion Avoidance 314
Congestion Management 316
Congestion Avoidance 323
Automatic QoS 327
Global Auto-QoS 327
Port-Specific Auto-QoS 330
Summary 333
Chapter 9 QoS Support on the Catalyst 6500 MSFC and FlexWAN 337
MSFC and FlexWAN Architectural Overview 338
Hardware and Software Requirements 339
QoS Support on the MSFC and FlexWAN 341
Classification 342
NBAR Protocol Discovery 343
NBAR Classification 345
Marking 346
Class-Based Marking 346
Marking Using Committed Access Rate (CAR) 349
Marking Using a Class-Based Policer 351
Policing and Shaping 352
Committed Access Rate (CAR) 353
Class-Based Policer 356
Distributed Traffic Shaping 360
Congestion Management and Scheduling 363
Distributed Weighted Fair Queuing 363
Distributed Class-Based Weighted Fair Queuing 364
Distributed Low Latency Queuing 368
Congestion Avoidance 370
Distributed Weighted Random Early Detection 370
Summary 374
xiii
Chapter 10 End-to-End QoS Case Studies 377
Chapter Prerequisites and Material Presentation 378
Multiplatform Campus Network Design and Topology 378
Access Layer Switches 381
Catalyst 2950G-24 381
Catalyst 4506 384
Distribution Layer 387
Catalyst 3550-12G 387
Catalyst 4507R 390
Core Layer 392
Catalyst 6500 Hybrid OS 393
Catalyst 6500 Hybrid MSFC 397
Catalyst 6500 Native IOS 397
Summary 400
Index 403
xiv
Icons Used in This Book
Throughout this book, you will see the following icons used for networking devices:
The following icons are used for peripherals and other devices:
DSU/CSU
Router Bridge Hub DSU/CSU
Catalyst
Switch
Multilayer
Switch
AT M
Switch
ISDN/Frame Relay
Switch
Communication
Server
Gateway
Access
Server
PC PC with
Software
Sun
Workstation
Macintosh
Terminal File
Server
Web
Server
Cisco Works
Workstation
Printer Laptop IBM
Mainframe
Front End
Processor
Cluster
Controller
Modem
xv
The following icons are used for networks and network connections:
Command Syntax Conventions
The conventions used to present command syntax in this book are the same conventions used in the Cisco IOS Software
Command Reference. The Command Reference describes these conventions as follows:
•
Vertical bars (|) separate alternative, mutually exclusive elements.
•
Square brackets [ ] indicate optional elements.
• Braces { } indicate a required choice.
• Braces within brackets [{ }] indicate a required choice within an optional element.
• Boldface indicates commands and keywords that are entered literally as shown. In actual
configuration examples and output (not general command syntax), boldface indicates
commands that are manually input by the user (such as a show command).
• Italics indicate arguments for which you supply actual values.
Network Cloud
Token
Ring
Token Ring
Line: Ethernet
FDDI
FDDI
Line: Serial
Line: Switched Serial
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