Users Guide

Related Conguration Tasks...................................................................................................................................696
Enabling PVST+............................................................................................................................................................. 696
Disabling PVST+.............................................................................................................................................................697
Inuencing PVST+ Root Selection...............................................................................................................................697
Modifying Global PVST+ Parameters..........................................................................................................................699
Modifying Interface PVST+ Parameters..................................................................................................................... 700
Conguring an EdgePort............................................................................................................................................... 701
PVST+ in Multi-Vendor Networks................................................................................................................................ 701
Enabling PVST+ Extend System ID.............................................................................................................................. 701
PVST+ Sample Congurations..................................................................................................................................... 702
42 Quality of Service (QoS)..........................................................................................................................705
Implementation Information..........................................................................................................................................707
Port-Based QoS Congurations...................................................................................................................................707
Setting dot1p Priorities for Incoming Trac......................................................................................................... 707
Honoring dot1p Priorities on Ingress Trac..........................................................................................................708
Conguring Port-Based Rate Policing...................................................................................................................709
Conguring Port-Based Rate Shaping..................................................................................................................709
Policy-Based QoS Congurations.................................................................................................................................710
Classify Trac...........................................................................................................................................................710
Create a QoS Policy..................................................................................................................................................714
Create Policy Maps.................................................................................................................................................. 716
DSCP Color Maps....................................................................................................................................................720
Enabling QoS Rate Adjustment....................................................................................................................................722
Enabling Strict-Priority Queueing................................................................................................................................ 722
Weighted Random Early Detection..............................................................................................................................723
Creating WRED Proles.......................................................................................................................................... 724
Applying a WRED Prole to Trac........................................................................................................................ 724
Displaying Default and Congured WRED Proles.............................................................................................. 724
Displaying WRED Drop Statistics...........................................................................................................................725
Displaying egress–queue Statistics....................................................................................................................... 725
Pre-Calculating Available QoS CAM Space................................................................................................................ 725
Conguring Weights and ECN for WRED ..................................................................................................................726
Global Service Pools With WRED and ECN Settings.......................................................................................... 727
Conguring WRED and ECN Attributes......................................................................................................................728
Guidelines for Conguring ECN for Classifying and Color-Marking Packets......................................................... 729
Sample conguration to mark non-ecn packets as “yellow” with Multiple trac class..................................729
Classifying Incoming Packets Using ECN and Color-Marking............................................................................730
Sample conguration to mark non-ecn packets as “yellow” with single trac class......................................732
Applying Layer 2 Match Criteria on a Layer 3 Interface......................................................................................733
Applying DSCP and VLAN Match Criteria on a Service Queue......................................................................... 733
Enabling Buer Statistics Tracking ............................................................................................................................. 734
43 Routing Information Protocol (RIP)..........................................................................................................737
Protocol Overview......................................................................................................................................................... 737
RIPv1..........................................................................................................................................................................737
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