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Protocol Overview..........................................................................................................................................................695

Implementation Information......................................................................................................................................... 696

Configure Per-VLAN Spanning Tree Plus................................................................................................................. 697

Enabling PVST+...............................................................................................................................................................697

Disabling PVST+..............................................................................................................................................................697

Influencing PVST+ Root Selection............................................................................................................................. 698

Modifying Global PVST+ Parameters........................................................................................................................ 699

Modifying Interface PVST+ Parameters................................................................................................................... 699

Configuring an EdgePort...............................................................................................................................................700

PVST+ in Multi-Vendor Networks............................................................................................................................... 701

Enabling PVST+ Extend System ID............................................................................................................................. 701

PVST+ Sample Configurations.................................................................................................................................... 702

Chapter 42: Quality of Service (QoS)........................................................................................ 704

Implementation Information..........................................................................................................................................706

Port-Based QoS Configurations..................................................................................................................................706

Setting dot1p Priorities for Incoming Traffic...................................................................................................... 706

Honoring dot1p Priorities on Ingress Traffic....................................................................................................... 707

Configuring Port-Based Rate Policing..................................................................................................................707

Configuring Port-Based Rate Shaping.................................................................................................................708

Policy-Based QoS Configurations...............................................................................................................................709

Classify Traffic...........................................................................................................................................................709

Dot1p to Queue Mapping Requirement.................................................................................................................712

Create a QoS Policy.................................................................................................................................................. 713

DSCP Color Maps...................................................................................................................................................... 715

Create Policy Maps....................................................................................................................................................716

Enabling QoS Rate Adjustment.................................................................................................................................... 719

Enabling Strict-Priority Queueing............................................................................................................................... 720

Queue Classification Requirements for PFC Functionality................................................................................... 720

Support for marking dot1p value in L3 Input Qos Policy........................................................................................ 721

Weighted Random Early Detection..............................................................................................................................721

Enabling and Disabling WRED Globally.................................................................................................................722

Creating WRED Profiles...........................................................................................................................................722

Applying a WRED Profile to Traffic.......................................................................................................................723

Displaying Default and Configured WRED Profiles............................................................................................723

Displaying WRED Drop Statistics.......................................................................................................................... 723

Displaying egress–queue Statistics.......................................................................................................................723

Pre-Calculating Available QoS CAM Space.............................................................................................................. 724

Specifying Policy-Based Rate Shaping in Packets Per Second...........................................................................725

Configuring Policy-Based Rate Shaping....................................................................................................................725

Configuring Weights and ECN for WRED ................................................................................................................ 726

Configuring WRED and ECN Attributes.....................................................................................................................727

Guidelines for Configuring ECN for Classifying and Color-Marking Packets................................................... 728

Sample configuration to mark non-ecn packets as “yellow” with Multiple traffic class..........................728

Classifying Incoming Packets Using ECN and Color-Marking........................................................................729

Sample configuration to mark non-ecn packets as “yellow” with single traffic class.............................. 730

Applying Layer 2 Match Criteria on a Layer 3 Interface.........................................................................................731

Managing Hardware Buffer Statistics..................................................................................................................732

Enabling Buffer Statistics Tracking ........................................................................................................................... 732

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