36 Per-VLAN Spanning Tree Plus (PVST+).........................................................635Protocol Overview............................................................................................................................ 635Implementation Information............................................................................................................636Configure Per-VLAN Spanning Tree Plus........................................................................................ 636Related Configuration Tasks...................................................................................................... 636Enabling PVST+.................................................................................................................................637Disabling PVST+................................................................................................................................ 637Influencing PVST+ Root Selection................................................................................................... 637Modifying Global PVST+ Parameters...............................................................................................639Modifying Interface PVST+ Parameters...........................................................................................640Configuring an EdgePort.................................................................................................................. 641PVST+ in Multi-Vendor Networks....................................................................................................642Enabling PVST+ Extend System ID...................................................................................................642PVST+ Sample Configurations......................................................................................................... 64337 Quality of Service (QoS)................................................................................... 645Implementation Information............................................................................................................ 647Port-Based QoS Configurations...................................................................................................... 647Setting dot1p Priorities for Incoming Traffic............................................................................. 648Honoring dot1p Priorities on Ingress Traffic............................................................................. 648Configuring Port-Based Rate Policing.......................................................................................649Configuring Port-Based Rate Shaping.......................................................................................649Policy-Based QoS Configurations................................................................................................... 650Classify Traffic..............................................................................................................................651Create a QoS Policy....................................................................................................................654Create Policy Maps..................................................................................................................... 656Enabling QoS Rate Adjustment........................................................................................................ 659Enabling Strict-Priority Queueing....................................................................................................660Weighted Random Early Detection................................................................................................. 660Creating WRED Profiles...............................................................................................................661Applying a WRED Profile to Traffic............................................................................................. 661Displaying Default and Configured WRED Profiles................................................................... 662Displaying WRED Drop Statistics................................................................................................662Pre-Calculating Available QoS CAM Space..................................................................................... 662Configuring Weights and ECN for WRED ....................................................................................... 663Global Service Pools With WRED and ECN Settings................................................................. 664Configuring WRED and ECN Attributes........................................................................................... 665Classifying Layer 2 Traffic on Layer 3 Interfaces ............................................................................ 667Classifying Packets Based on a Combination of DSCP Code Points and VLAN IDs......................66738 Routing Information Protocol (RIP)..............................................................669
