Concept Guide

Disabling PVST+............................................................................................................................................................. 681
Inuencing PVST+ Root Selection............................................................................................................................... 681
Modifying Global PVST+ Parameters..........................................................................................................................683
Modifying Interface PVST+ Parameters..................................................................................................................... 684
Conguring an EdgePort.............................................................................................................................................. 685
PVST+ in Multi-Vendor Networks............................................................................................................................... 685
Enabling PVST+ Extend System ID............................................................................................................................. 685
PVST+ Sample Congurations.....................................................................................................................................686
40 Quality of Service (QoS)......................................................................................................................... 689
Implementation Information.......................................................................................................................................... 691
Port-Based QoS Congurations...................................................................................................................................691
Setting dot1p Priorities for Incoming Trac..........................................................................................................691
Honoring dot1p Priorities on Ingress Trac..........................................................................................................692
Conguring Port-Based Rate Policing.................................................................................................................. 693
Conguring Port-Based Rate Shaping..................................................................................................................693
Policy-Based QoS Congurations................................................................................................................................694
Classify Trac..........................................................................................................................................................695
Create a QoS Policy................................................................................................................................................ 698
Create Policy Maps..................................................................................................................................................700
DSCP Color Maps..........................................................................................................................................................704
Creating a DSCP Color Map...................................................................................................................................704
Displaying DSCP Color Maps................................................................................................................................. 705
Displaying a DSCP Color Policy Conguration ....................................................................................................705
Enabling QoS Rate Adjustment....................................................................................................................................706
Enabling Strict-Priority Queueing................................................................................................................................ 706
Weighted Random Early Detection..............................................................................................................................707
Creating WRED Proles..........................................................................................................................................708
Applying a WRED Prole to Trac........................................................................................................................ 708
Displaying Default and Congured WRED Proles.............................................................................................. 708
Displaying WRED Drop Statistics...........................................................................................................................709
Displaying egress–queue Statistics....................................................................................................................... 709
Pre-Calculating Available QoS CAM Space................................................................................................................709
Conguring Weights and ECN for WRED .................................................................................................................. 710
Global Service Pools With WRED and ECN Settings........................................................................................... 711
Conguring WRED and ECN Attributes...................................................................................................................... 712
Guidelines for Conguring ECN for Classifying and Color-Marking Packets..........................................................713
Sample conguration to mark non-ecn packets as “yellow” with Multiple trac class.................................. 713
Classifying Incoming Packets Using ECN and Color-Marking............................................................................ 714
Sample conguration to mark non-ecn packets as “yellow” with single trac class...................................... 715
Applying Layer 2 Match Criteria on a Layer 3 Interface............................................................................................ 716
Applying DSCP and VLAN Match Criteria on a Service Queue................................................................................717
Classifying Incoming Packets Using ECN and Color-Marking.................................................................................. 718
Guidelines for Conguring ECN for Classifying and Color-Marking Packets......................................................... 720
Sample conguration to mark non-ecn packets as “yellow” with Multiple trac class........................................720
Sample conguration to mark non-ecn packets as “yellow” with single trac class.............................................721
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