Users Guide

Protocol to CPU Queue Mapping..........................................................................................................................240
Configuring Protocol to CPU Queue Mapping....................................................................................................241
Displaying CoPP Configuration .............................................................................................................................242
Chapter 12: Data Center Bridging (DCB)....................................................................................244
Ethernet Enhancements in Data Center Bridging...................................................................................................244
Priority-Based Flow Control................................................................................................................................... 245
Enhanced Transmission Selection.........................................................................................................................246
Data Center Bridging Exchange Protocol (DCBx)............................................................................................ 247
Data Center Bridging in a Traffic Flow................................................................................................................ 248
Buffer Organization.................................................................................................................................................. 248
Enabling Data Center Bridging..................................................................................................................................... 251
DCB Maps and its Attributes.................................................................................................................................. 251
Data Center Bridging: Default Configuration........................................................................................................... 252
Configuring Priority-Based Flow Control.................................................................................................................. 252
Configuring Lossless Queues................................................................................................................................. 253
Configuring PFC in a DCB Map................................................................................................................................... 254
Applying a DCB Map on a Port....................................................................................................................................256
Configuring PFC without a DCB Map........................................................................................................................256
Priority-Based Flow Control Using Dynamic Buffer Method............................................................................... 258
Shared headroom for lossless or PFC packets........................................................................................................259
Configuring Shared Head Room Buffer...............................................................................................................260
Viewing Shared Head Room Usage....................................................................................................................... 261
Monitoring Buffer Statistics for Tracking Purposes......................................................................................... 261
Behavior of Tagged Packets.........................................................................................................................................261
Configuration Example for DSCP and PFC Priorities.............................................................................................262
SNMP Support for PFC and Buffer Statistics Tracking........................................................................................263
Performing PFC Using DSCP Bits Instead of 802.1p Bits.....................................................................................263
PFC and ETS Configuration Examples...................................................................................................................... 265
Using PFC to Manage Converged Ethernet Traffic...............................................................................................265
Operations on Untagged Packets...............................................................................................................................265
Generation of PFC for a Priority for Untagged Packets.......................................................................................266
Configure Enhanced Transmission Selection........................................................................................................... 266
Creating an ETS Priority Group.............................................................................................................................266
ETS Operation with DCBx.......................................................................................................................................267
Configuring ETS in a DCB Map..............................................................................................................................267
Hierarchical Scheduling in ETS Output Policies...................................................................................................... 269
Using ETS to Manage Converged Ethernet Traffic............................................................................................... 269
Applying DCB Policies in a Switch Stack.................................................................................................................. 269
Configure a DCBx Operation........................................................................................................................................269
DCBx Operation.........................................................................................................................................................270
DCBx Port Roles........................................................................................................................................................270
DCB Configuration Exchange..................................................................................................................................271
Configuration Source Election................................................................................................................................ 271
Propagation of DCB Information........................................................................................................................... 272
Auto-Detection and Manual Configuration of the DCBx Version..................................................................272
DCBx Example............................................................................................................................................................273
DCBx Prerequisites and Restrictions....................................................................................................................273
Configuring DCBx......................................................................................................................................................273
Verifying the DCB Configuration................................................................................................................................. 277
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