Users Guide

Inuencing PVST+ Root Selection............................................................................................................................ 677
Modifying Global PVST+ Parameters..............................................................................................................................678
Modifying Interface PVST+ Parameters......................................................................................................................... 679
Conguring an EdgePort................................................................................................................................................680
PVST+ in Multi-Vendor Networks................................................................................................................................... 681
Enabling PVST+ Extend System ID................................................................................................................................. 681
PVST+ Sample Congurations....................................................................................................................................... 682
47 Quality of Service (QoS)........................................................................................... 684
Implementation Information........................................................................................................................................... 685
Port-Based QoS Congurations.....................................................................................................................................686
Setting dot1p Priorities for Incoming Trac..............................................................................................................686
Honoring dot1p Priorities on Ingress Trac.............................................................................................................. 686
Conguring Port-Based Rate Policing...................................................................................................................... 687
Conguring Port-Based Rate Shaping......................................................................................................................687
Policy-Based QoS Congurations...................................................................................................................................688
Classify Trac..........................................................................................................................................................688
Create a QoS Policy..................................................................................................................................................691
Create Policy Maps.................................................................................................................................................. 693
DSCP Color Maps..........................................................................................................................................................696
Creating a DSCP Color Map.................................................................................................................................... 696
Displaying DSCP Color Maps....................................................................................................................................697
Displaying a DSCP Color Policy Conguration .........................................................................................................698
Enabling QoS Rate Adjustment...................................................................................................................................... 698
Enabling Strict-Priority Queueing................................................................................................................................... 699
Weighted Random Early Detection.................................................................................................................................699
Creating WRED Proles........................................................................................................................................... 700
Applying a WRED Prole to Trac........................................................................................................................... 700
Displaying Default and Congured WRED Proles.....................................................................................................701
Displaying WRED Drop Statistics...............................................................................................................................701
Displaying egress-queue Statistics............................................................................................................................ 701
Pre-Calculating Available QoS CAM Space.....................................................................................................................702
Conguring Weights and ECN for WRED ...................................................................................................................... 703
Global Service Pools With WRED and ECN Settings................................................................................................ 703
Conguring WRED and ECN Attributes..........................................................................................................................704
Guidelines for Conguring ECN for Classifying and Color-Marking Packets................................................................... 705
Sample conguration to mark non-ecn packets as “yellow” with Multiple trac class............................................. 706
Classifying Incoming Packets Using ECN and Color-Marking................................................................................... 706
Sample conguration to mark non-ecn packets as “yellow” with single trac class................................................. 708
Applying Layer 2 Match Criteria on a Layer 3 Interface.................................................................................................. 709
Applying DSCP and VLAN Match Criteria on a Service Queue.......................................................................................709
Classifying Incoming Packets Using ECN and Color-Marking..........................................................................................710
Guidelines for Conguring ECN for Classifying and Color-Marking Packets....................................................................712
Sample conguration to mark non-ecn packets as “yellow” with Multiple trac class.................................................... 712
Sample conguration to mark non-ecn packets as “yellow” with single trac class........................................................713
Enabling Buer Statistics Tracking .................................................................................................................................714
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