Users Guide

Inspecting the Private VLAN Conguration............................................................................................................... 576
38 Per-VLAN Spanning Tree Plus (PVST+)....................................................................................................578
Protocol Overview......................................................................................................................................................... 578
Implementation Information..........................................................................................................................................579
Congure Per-VLAN Spanning Tree Plus....................................................................................................................579
Related Conguration Tasks................................................................................................................................... 579
Enabling PVST+..............................................................................................................................................................579
Disabling PVST+.............................................................................................................................................................579
Inuencing PVST+ Root Selection.............................................................................................................................. 580
Modifying Global PVST+ Parameters...........................................................................................................................581
Modifying Interface PVST+ Parameters..................................................................................................................... 582
Conguring an EdgePort.............................................................................................................................................. 583
PVST+ in Multi-Vendor Networks............................................................................................................................... 583
Enabling PVST+ Extend System ID............................................................................................................................. 584
PVST+ Sample Congurations.....................................................................................................................................584
39 Quality of Service (QoS)..........................................................................................................................587
Implementation Information......................................................................................................................................... 589
Port-Based QoS Congurations.................................................................................................................................. 589
Setting dot1p Priorities for Incoming Trac.........................................................................................................589
Honoring dot1p Priorities on Ingress Trac..........................................................................................................590
Conguring Port-Based Rate Policing................................................................................................................... 591
Conguring Port-Based Rate Shaping...................................................................................................................591
Policy-Based QoS Congurations................................................................................................................................592
Classify Trac..........................................................................................................................................................592
Create a QoS Policy................................................................................................................................................ 596
Create Policy Maps..................................................................................................................................................598
DSCP Color Maps.......................................................................................................................................................... 601
Creating a DSCP Color Map.................................................................................................................................. 602
Displaying DSCP Color Maps................................................................................................................................. 603
Displaying a DSCP Color Policy Conguration ....................................................................................................603
Enabling QoS Rate Adjustment....................................................................................................................................604
Enabling Strict-Priority Queueing................................................................................................................................ 604
Weighted Random Early Detection............................................................................................................................. 604
Creating WRED Proles..........................................................................................................................................606
Applying a WRED Prole to Trac........................................................................................................................606
Displaying Default and Congured WRED Proles.............................................................................................. 607
Displaying WRED Drop Statistics...........................................................................................................................607
Displaying egress-queue Statistics........................................................................................................................608
Pre-Calculating Available QoS CAM Space................................................................................................................608
Conguring Weights and ECN for WRED ................................................................................................................. 609
Global Service Pools With WRED and ECN Settings.......................................................................................... 610
Conguring WRED and ECN Attributes.......................................................................................................................611
Guidelines for Conguring ECN for Classifying and Color-Marking Packets...........................................................611
Sample conguration to mark non-ecn packets as “yellow” with Multiple trac class.................................. 612
Classifying Incoming Packets Using ECN and Color-Marking............................................................................ 612
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