Users Guide

Influencing PVST+ Root Selection..............................................................................................................................625
Modifying Global PVST+ Parameters......................................................................................................................... 627
Modifying Interface PVST+ Parameters.................................................................................................................... 628
Configuring an EdgePort..............................................................................................................................................629
PVST+ in Multi-Vendor Networks.............................................................................................................................. 629
Enabling PVST+ Extend System ID.............................................................................................................................629
PVST+ Sample Configurations.................................................................................................................................... 630
39 Quality of Service (QoS)......................................................................................................................... 633
Implementation Information......................................................................................................................................... 635
Port-Based QoS Configurations..................................................................................................................................635
Setting dot1p Priorities for Incoming Traffic........................................................................................................635
Honoring dot1p Priorities on Ingress Traffic.........................................................................................................636
Configuring Port-Based Rate Policing.................................................................................................................. 637
Configuring Port-Based Rate Shaping..................................................................................................................637
Policy-Based QoS Configurations............................................................................................................................... 638
Classify Traffic......................................................................................................................................................... 639
Create a QoS Policy................................................................................................................................................ 642
Create Policy Maps................................................................................................................................................. 644
DSCP Color Maps..........................................................................................................................................................648
Creating a DSCP Color Map.................................................................................................................................. 648
Displaying DSCP Color Maps................................................................................................................................. 649
Displaying a DSCP Color Policy Configuration ....................................................................................................649
Enabling QoS Rate Adjustment................................................................................................................................... 650
Enabling Strict-Priority Queueing.................................................................................................................................651
Weighted Random Early Detection..............................................................................................................................651
Creating WRED Profiles......................................................................................................................................... 652
Applying a WRED Profile to Traffic.......................................................................................................................653
Displaying Default and Configured WRED Profiles............................................................................................. 653
Displaying WRED Drop Statistics.......................................................................................................................... 653
Displaying egress–queue Statistics.......................................................................................................................654
Pre-Calculating Available QoS CAM Space............................................................................................................... 654
Configuring Weights and ECN for WRED .................................................................................................................655
Global Service Pools With WRED and ECN Settings......................................................................................... 656
Configuring WRED and ECN Attributes..................................................................................................................... 657
Guidelines for Configuring ECN for Classifying and Color-Marking Packets.........................................................657
Sample configuration to mark non-ecn packets as “yellow” with Multiple traffic class................................ 658
Classifying Incoming Packets Using ECN and Color-Marking...........................................................................658
Sample configuration to mark non-ecn packets as “yellow” with single traffic class.................................... 660
Applying Layer 2 Match Criteria on a Layer 3 Interface............................................................................................661
Applying DSCP and VLAN Match Criteria on a Service Queue...............................................................................662
Classifying Incoming Packets Using ECN and Color-Marking.................................................................................663
Guidelines for Configuring ECN for Classifying and Color-Marking Packets........................................................ 664
Sample configuration to mark non-ecn packets as “yellow” with Multiple traffic class...................................... 665
Sample configuration to mark non-ecn packets as “yellow” with single traffic class.......................................... 665
Contents
21