Connectivity Guide

Table Of Contents
Protocol Overview.......................................................................................................................................................... 703
Implementation Information..........................................................................................................................................704
Configure Per-VLAN Spanning Tree Plus................................................................................................................. 705
Enabling PVST+...............................................................................................................................................................705
Disabling PVST+..............................................................................................................................................................705
Influencing PVST+ Root Selection..............................................................................................................................706
Modifying Global PVST+ Parameters.........................................................................................................................707
Modifying Interface PVST+ Parameters................................................................................................................... 707
Configuring an EdgePort...............................................................................................................................................708
PVST+ in Multi-Vendor Networks.............................................................................................................................. 709
Enabling PVST+ Extend System ID............................................................................................................................ 709
PVST+ Sample Configurations..................................................................................................................................... 710
Chapter 44: Quality of Service (QoS)......................................................................................... 712
Implementation Information.......................................................................................................................................... 714
Port-Based QoS Configurations...................................................................................................................................714
Setting dot1p Priorities for Incoming Traffic.......................................................................................................714
Honoring dot1p Priorities on Ingress Traffic........................................................................................................715
Configuring Port-Based Rate Policing.................................................................................................................. 715
Configuring Port-Based Rate Shaping..................................................................................................................716
Policy-Based QoS Configurations................................................................................................................................ 717
Classify Traffic............................................................................................................................................................ 717
Create a QoS Policy..................................................................................................................................................720
Create Policy Maps...................................................................................................................................................722
DSCP Color Maps........................................................................................................................................................... 725
Creating a DSCP Color Map...................................................................................................................................725
Displaying DSCP Color Maps..................................................................................................................................726
Displaying a DSCP Color Policy Configuration ..................................................................................................727
Enabling QoS Rate Adjustment....................................................................................................................................727
Enabling Strict-Priority Queueing................................................................................................................................728
Weighted Random Early Detection.............................................................................................................................728
Creating WRED Profiles...........................................................................................................................................729
Applying a WRED Profile to Traffic.......................................................................................................................729
Displaying Default and Configured WRED Profiles........................................................................................... 729
Displaying WRED Drop Statistics.......................................................................................................................... 730
Displaying egressqueue Statistics...................................................................................................................... 730
Pre-Calculating Available QoS CAM Space.............................................................................................................. 730
Configuring Weights and ECN for WRED .................................................................................................................731
Configuring WRED and ECN Attributes.................................................................................................................... 732
Guidelines for Configuring ECN for Classifying and Color-Marking Packets................................................... 733
Sample configuration to mark non-ecn packets as yellow with Multiple traffic class..........................734
Classifying Incoming Packets Using ECN and Color-Marking........................................................................734
Sample configuration to mark non-ecn packets as yellow with single traffic class.............................. 735
Applying Layer 2 Match Criteria on a Layer 3 Interface........................................................................................737
Applying DSCP and VLAN Match Criteria on a Service Queue........................................................................... 737
Classifying Incoming Packets Using ECN and Color-Marking..............................................................................738
Guidelines for Configuring ECN for Classifying and Color-Marking Packets................................................... 739
Sample configuration to mark non-ecn packets as yellow with Multiple traffic class................................740
Sample configuration to mark non-ecn packets as yellow with single traffic class....................................740
Enabling Buffer Statistics Tracking ............................................................................................................................741
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