Deployment Guide

Table Of Contents
Protocol Overview..........................................................................................................................................................690
Implementation Information.......................................................................................................................................... 691
Configure Per-VLAN Spanning Tree Plus................................................................................................................. 692
Enabling PVST+...............................................................................................................................................................692
Disabling PVST+..............................................................................................................................................................692
Influencing PVST+ Root Selection............................................................................................................................. 693
Modifying Global PVST+ Parameters........................................................................................................................ 694
Modifying Interface PVST+ Parameters................................................................................................................... 694
Configuring an EdgePort.............................................................................................................................................. 695
PVST+ in Multi-Vendor Networks.............................................................................................................................. 696
Enabling PVST+ Extend System ID............................................................................................................................ 696
PVST+ Sample Configurations.................................................................................................................................... 697
Chapter 42: Quality of Service (QoS)........................................................................................ 699
Implementation Information.......................................................................................................................................... 701
Port-Based QoS Configurations...................................................................................................................................701
Setting dot1p Priorities for Incoming Traffic.......................................................................................................701
Honoring dot1p Priorities on Ingress Traffic....................................................................................................... 702
Configuring Port-Based Rate Policing................................................................................................................. 702
Configuring Port-Based Rate Shaping.................................................................................................................702
Policy-Based QoS Configurations............................................................................................................................... 703
Classify Traffic...........................................................................................................................................................704
Dot1p to Queue Mapping Requirement................................................................................................................706
Create a QoS Policy..................................................................................................................................................707
DSCP Color Maps..................................................................................................................................................... 709
Create Policy Maps.................................................................................................................................................... 711
Enabling QoS Rate Adjustment.................................................................................................................................... 714
Enabling Strict-Priority Queueing................................................................................................................................ 714
Queue Classification Requirements for PFC Functionality....................................................................................715
Support for marking dot1p value in L3 Input Qos Policy........................................................................................ 715
Weighted Random Early Detection..............................................................................................................................716
Enabling and Disabling WRED Globally................................................................................................................. 716
Creating WRED Profiles............................................................................................................................................717
Applying a WRED Profile to Traffic........................................................................................................................717
Displaying Default and Configured WRED Profiles............................................................................................ 717
Displaying WRED Drop Statistics........................................................................................................................... 717
Displaying egressqueue Statistics....................................................................................................................... 717
Pre-Calculating Available QoS CAM Space............................................................................................................... 718
Specifying Policy-Based Rate Shaping in Packets Per Second............................................................................719
Configuring Policy-Based Rate Shaping.....................................................................................................................719
Configuring Weights and ECN for WRED ................................................................................................................720
Configuring WRED and ECN Attributes..................................................................................................................... 721
Guidelines for Configuring ECN for Classifying and Color-Marking Packets................................................... 722
Sample configuration to mark non-ecn packets as yellow with Multiple traffic class..........................722
Classifying Incoming Packets Using ECN and Color-Marking........................................................................723
Sample configuration to mark non-ecn packets as yellow with single traffic class.............................. 724
Applying Layer 2 Match Criteria on a Layer 3 Interface........................................................................................725
Managing Hardware Buffer Statistics..................................................................................................................726
Enabling Buffer Statistics Tracking ........................................................................................................................... 726
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