Administrator Guide

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Implementation Information..........................................................................................................................................643

Configure Per-VLAN Spanning Tree Plus................................................................................................................. 644

Enabling PVST+...............................................................................................................................................................644

Disabling PVST+..............................................................................................................................................................644

Influencing PVST+ Root Selection............................................................................................................................. 645

Modifying Global PVST+ Parameters........................................................................................................................ 646

Modifying Interface PVST+ Parameters................................................................................................................... 646

Configuring an EdgePort...............................................................................................................................................647

PVST+ in Multi-Vendor Networks.............................................................................................................................. 648

Enabling PVST+ Extend System ID............................................................................................................................ 648

PVST+ Sample Configurations.................................................................................................................................... 649

Chapter 43: Quality of Service (QoS).........................................................................................651

Implementation Information......................................................................................................................................... 653

Port-Based QoS Configurations..................................................................................................................................653

Setting dot1p Priorities for Incoming Traffic......................................................................................................653

Honoring dot1p Priorities on Ingress Traffic.......................................................................................................654

Configuring Port-Based Rate Policing................................................................................................................. 654

Configuring Port-Based Rate Shaping.................................................................................................................655

Policy-Based QoS Configurations...............................................................................................................................656

Classify Traffic...........................................................................................................................................................656

Create a QoS Policy................................................................................................................................................. 659

Create Policy Maps................................................................................................................................................... 661

DSCP Color Maps........................................................................................................................................................... 664

Creating a DSCP Color Map...................................................................................................................................664

Displaying DSCP Color Maps................................................................................................................................. 665

Displaying a DSCP Color Policy Configuration ................................................................................................. 665

Enabling QoS Rate Adjustment................................................................................................................................... 666

Enabling Strict-Priority Queueing............................................................................................................................... 666

Weighted Random Early Detection.............................................................................................................................667

Creating WRED Profiles...........................................................................................................................................667

Applying a WRED Profile to Traffic...................................................................................................................... 668

Displaying Default and Configured WRED Profiles........................................................................................... 668

Displaying WRED Drop Statistics..........................................................................................................................668

Displaying egress–queue Statistics...................................................................................................................... 669

Pre-Calculating Available QoS CAM Space..............................................................................................................669

Configuring Weights and ECN for WRED ................................................................................................................670

Configuring WRED and ECN Attributes..................................................................................................................... 671

Guidelines for Configuring ECN for Classifying and Color-Marking Packets................................................... 672

Sample configuration to mark non-ecn packets as “yellow” with Multiple traffic class..........................673

Classifying Incoming Packets Using ECN and Color-Marking........................................................................673

Sample configuration to mark non-ecn packets as “yellow” with single traffic class.............................. 674

Applying Layer 2 Match Criteria on a Layer 3 Interface........................................................................................676

Applying DSCP and VLAN Match Criteria on a Service Queue........................................................................... 676

Classifying Incoming Packets Using ECN and Color-Marking..............................................................................677

Guidelines for Configuring ECN for Classifying and Color-Marking Packets................................................... 678

Sample configuration to mark non-ecn packets as “yellow” with Multiple traffic class................................679

Sample configuration to mark non-ecn packets as “yellow” with single traffic class....................................679

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