Administrator Guide

Protocol Overview............................................................................................................................................................ 660
Implementation Information..............................................................................................................................................661
Configure Per-VLAN Spanning Tree Plus.......................................................................................................................661
Enabling PVST+................................................................................................................................................................. 661
Disabling PVST+.................................................................................................................................................................661
Influencing PVST+ Root Selection..................................................................................................................................662
Modifying Global PVST+ Parameters.............................................................................................................................663
Modifying Interface PVST+ Parameters........................................................................................................................664
Configuring an EdgePort..................................................................................................................................................664
PVST+ in Multi-Vendor Networks..................................................................................................................................665
Enabling PVST+ Extend System ID................................................................................................................................ 665
PVST+ Sample Configurations........................................................................................................................................666
42 Quality of Service (QoS)......................................................................................................... 668
Implementation Information.............................................................................................................................................670
Port-Based QoS Configurations......................................................................................................................................670
Setting dot1p Priorities for Incoming Traffic............................................................................................................670
Honoring dot1p Priorities on Ingress Traffic..............................................................................................................671
Configuring Port-Based Rate Policing.......................................................................................................................671
Configuring Port-Based Rate Shaping...................................................................................................................... 671
Policy-Based QoS Configurations................................................................................................................................... 672
Classify Traffic............................................................................................................................................................. 672
Dot1p to Queue Mapping Requirement.................................................................................................................... 675
Create a QoS Policy.................................................................................................................................................... 676
DSCP Color Maps........................................................................................................................................................677
Create Policy Maps..................................................................................................................................................... 679
Enabling QoS Rate Adjustment....................................................................................................................................... 682
Enabling Strict-Priority Queueing....................................................................................................................................682
Queue Classification Requirements for PFC Functionality.......................................................................................... 682
Support for marking dot1p value in L3 Input Qos Policy.............................................................................................. 683
Weighted Random Early Detection.................................................................................................................................683
Enabling and Disabling WRED Globally..................................................................................................................... 684
Creating WRED Profiles............................................................................................................................................. 684
Applying a WRED Profile to Traffic...........................................................................................................................685
Displaying Default and Configured WRED Profiles................................................................................................. 685
Displaying WRED Drop Statistics.............................................................................................................................. 685
Displaying egress–queue Statistics...........................................................................................................................685
Pre-Calculating Available QoS CAM Space...................................................................................................................686
Specifying Policy-Based Rate Shaping in Packets Per Second.................................................................................. 687
Configuring Policy-Based Rate Shaping.........................................................................................................................687
Configuring Weights and ECN for WRED .....................................................................................................................687
Configuring WRED and ECN Attributes.........................................................................................................................689
Guidelines for Configuring ECN for Classifying and Color-Marking Packets............................................................690
Sample configuration to mark non-ecn packets as “yellow” with Multiple traffic class.................................... 690
Classifying Incoming Packets Using ECN and Color-Marking...............................................................................690
Sample configuration to mark non-ecn packets as “yellow” with single traffic class........................................ 692
Applying Layer 2 Match Criteria on a Layer 3 Interface.............................................................................................. 693
Managing Hardware Buffer Statistics...................................................................................................................... 693
Enabling Buffer Statistics Tracking ................................................................................................................................694
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