Setup Guide

Disabling PVST+.............................................................................................................................................................682
Inuencing PVST+ Root Selection...............................................................................................................................682
Modifying Global PVST+ Parameters..........................................................................................................................684
Modifying Interface PVST+ Parameters.....................................................................................................................685
Conguring an EdgePort.............................................................................................................................................. 686
PVST+ in Multi-Vendor Networks............................................................................................................................... 686
Enabling PVST+ Extend System ID............................................................................................................................. 686
PVST+ Sample Congurations..................................................................................................................................... 687
40 Quality of Service (QoS)......................................................................................................................... 690
Implementation Information..........................................................................................................................................692
Port-Based QoS Congurations.................................................................................................................................. 692
Setting dot1p Priorities for Incoming Trac.........................................................................................................692
Honoring dot1p Priorities on Ingress Trac..........................................................................................................693
Conguring Port-Based Rate Policing.................................................................................................................. 694
Conguring Port-Based Rate Shaping..................................................................................................................694
Policy-Based QoS Congurations................................................................................................................................695
Classify Trac..........................................................................................................................................................696
Create a QoS Policy................................................................................................................................................ 699
Create Policy Maps...................................................................................................................................................701
DSCP Color Maps..........................................................................................................................................................705
Creating a DSCP Color Map...................................................................................................................................705
Displaying DSCP Color Maps................................................................................................................................. 706
Displaying a DSCP Color Policy Conguration ....................................................................................................706
Enabling QoS Rate Adjustment.................................................................................................................................... 707
Enabling Strict-Priority Queueing.................................................................................................................................707
Weighted Random Early Detection..............................................................................................................................708
Creating WRED Proles..........................................................................................................................................709
Applying a WRED Prole to Trac........................................................................................................................ 709
Displaying Default and Congured WRED Proles.............................................................................................. 709
Displaying WRED Drop Statistics............................................................................................................................710
Displaying egress–queue Statistics........................................................................................................................710
Pre-Calculating Available QoS CAM Space.................................................................................................................710
Conguring Weights and ECN for WRED ................................................................................................................... 711
Global Service Pools With WRED and ECN Settings...........................................................................................712
Conguring WRED and ECN Attributes...................................................................................................................... 713
Guidelines for Conguring ECN for Classifying and Color-Marking Packets..........................................................714
Sample conguration to mark non-ecn packets as “yellow” with Multiple trac class.................................. 714
Classifying Incoming Packets Using ECN and Color-Marking............................................................................ 715
Sample conguration to mark non-ecn packets as “yellow” with single trac class...................................... 716
Applying Layer 2 Match Criteria on a Layer 3 Interface.............................................................................................717
Applying DSCP and VLAN Match Criteria on a Service Queue................................................................................718
Classifying Incoming Packets Using ECN and Color-Marking.................................................................................. 719
Guidelines for Conguring ECN for Classifying and Color-Marking Packets..........................................................721
Sample conguration to mark non-ecn packets as “yellow” with Multiple trac class.........................................721
Sample conguration to mark non-ecn packets as “yellow” with single trac class............................................722
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