White Papers

Inspecting the Private VLAN Conguration................................................................................................................ 717
41 Per-VLAN Spanning Tree Plus (PVST+).....................................................................................................719
Protocol Overview..........................................................................................................................................................719
Implementation Information..........................................................................................................................................720
Congure Per-VLAN Spanning Tree Plus....................................................................................................................720
Related Conguration Tasks................................................................................................................................... 720
Enabling PVST+..............................................................................................................................................................720
Disabling PVST+..............................................................................................................................................................721
Inuencing PVST+ Root Selection................................................................................................................................721
Modifying Global PVST+ Parameters.......................................................................................................................... 723
Modifying Interface PVST+ Parameters......................................................................................................................724
Conguring an EdgePort.............................................................................................................................................. 725
PVST+ in Multi-Vendor Networks................................................................................................................................725
Enabling PVST+ Extend System ID............................................................................................................................. 725
PVST+ Sample Congurations..................................................................................................................................... 726
42 Quality of Service (QoS)..........................................................................................................................729
Implementation Information...........................................................................................................................................731
Port-Based QoS Congurations................................................................................................................................... 731
Setting dot1p Priorities for Incoming Trac..........................................................................................................731
Honoring dot1p Priorities on Ingress Trac..........................................................................................................732
Conguring Port-Based Rate Policing...................................................................................................................733
Conguring Port-Based Rate Shaping.................................................................................................................. 733
Policy-Based QoS Congurations................................................................................................................................734
Classify Trac.......................................................................................................................................................... 734
Create a QoS Policy.................................................................................................................................................738
Create Policy Maps..................................................................................................................................................740
DSCP Color Maps..........................................................................................................................................................744
Creating a DSCP Color Map...................................................................................................................................744
Displaying DSCP Color Maps..................................................................................................................................745
Displaying a DSCP Color Policy Conguration .................................................................................................... 745
Enabling QoS Rate Adjustment....................................................................................................................................746
Enabling Strict-Priority Queueing.................................................................................................................................747
Weighted Random Early Detection.............................................................................................................................. 747
Creating WRED Proles.......................................................................................................................................... 748
Applying a WRED Prole to Trac........................................................................................................................ 749
Displaying Default and Congured WRED Proles.............................................................................................. 749
Displaying WRED Drop Statistics........................................................................................................................... 749
Displaying egress–queue Statistics....................................................................................................................... 750
Pre-Calculating Available QoS CAM Space................................................................................................................750
Conguring Weights and ECN for WRED .................................................................................................................. 751
Global Service Pools With WRED and ECN Settings...........................................................................................751
Conguring WRED and ECN Attributes......................................................................................................................752
Guidelines for Conguring ECN for Classifying and Color-Marking Packets......................................................... 753
Sample conguration to mark non-ecn packets as “yellow” with Multiple trac class..................................754
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