White Papers

Table Of Contents
Implementation Information......................................................................................................................................... 639
Configure Per-VLAN Spanning Tree Plus................................................................................................................. 640
Enabling PVST+...............................................................................................................................................................640
Disabling PVST+..............................................................................................................................................................640
Influencing PVST+ Root Selection.............................................................................................................................. 641
Modifying Global PVST+ Parameters........................................................................................................................ 642
Modifying Interface PVST+ Parameters................................................................................................................... 642
Configuring an EdgePort...............................................................................................................................................643
PVST+ in Multi-Vendor Networks.............................................................................................................................. 644
Enabling PVST+ Extend System ID............................................................................................................................ 644
PVST+ Sample Configurations.................................................................................................................................... 645
Chapter 43: Quality of Service (QoS)........................................................................................ 647
Implementation Information......................................................................................................................................... 649
Port-Based QoS Configurations..................................................................................................................................649
Setting dot1p Priorities for Incoming Traffic......................................................................................................649
Honoring dot1p Priorities on Ingress Traffic.......................................................................................................650
Configuring Port-Based Rate Policing.................................................................................................................650
Configuring Port-Based Rate Shaping................................................................................................................. 651
Policy-Based QoS Configurations...............................................................................................................................652
Classify Traffic...........................................................................................................................................................652
Create a QoS Policy................................................................................................................................................. 655
Create Policy Maps...................................................................................................................................................657
DSCP Color Maps...........................................................................................................................................................660
Creating a DSCP Color Map...................................................................................................................................660
Displaying DSCP Color Maps.................................................................................................................................. 661
Displaying a DSCP Color Policy Configuration .................................................................................................. 661
Enabling QoS Rate Adjustment................................................................................................................................... 662
Enabling Strict-Priority Queueing............................................................................................................................... 662
Weighted Random Early Detection.............................................................................................................................662
Creating WRED Profiles.......................................................................................................................................... 663
Applying a WRED Profile to Traffic...................................................................................................................... 663
Displaying Default and Configured WRED Profiles........................................................................................... 664
Displaying WRED Drop Statistics.......................................................................................................................... 664
Displaying egressqueue Statistics...................................................................................................................... 664
Pre-Calculating Available QoS CAM Space..............................................................................................................665
Configuring Weights and ECN for WRED ................................................................................................................666
Configuring WRED and ECN Attributes.................................................................................................................... 667
Guidelines for Configuring ECN for Classifying and Color-Marking Packets...................................................668
Sample configuration to mark non-ecn packets as yellow with Multiple traffic class..........................668
Classifying Incoming Packets Using ECN and Color-Marking........................................................................669
Sample configuration to mark non-ecn packets as yellow with single traffic class.............................. 670
Applying Layer 2 Match Criteria on a Layer 3 Interface........................................................................................ 671
Applying DSCP and VLAN Match Criteria on a Service Queue........................................................................... 672
Classifying Incoming Packets Using ECN and Color-Marking..............................................................................672
Guidelines for Configuring ECN for Classifying and Color-Marking Packets................................................... 674
Sample configuration to mark non-ecn packets as yellow with Multiple traffic class................................675
Sample configuration to mark non-ecn packets as yellow with single traffic class....................................675
20
Contents