Users Guide

Priority-Based Flow Control................................................................................................................................... 245
Enhanced Transmission Selection..........................................................................................................................246
Data Center Bridging Exchange Protocol (DCBx)...............................................................................................247
Data Center Bridging in a Trac Flow...................................................................................................................248
Enabling Data Center Bridging..................................................................................................................................... 248
DCB Maps and its Attributes..................................................................................................................................249
Data Center Bridging: Default Conguration............................................................................................................. 250
Conguring Priority-Based Flow Control....................................................................................................................250
Conguring Lossless Queues.................................................................................................................................. 251
Conguring PFC in a DCB Map................................................................................................................................... 252
PFC Conguration Notes........................................................................................................................................252
PFC Prerequisites and Restrictions.......................................................................................................................253
Applying a DCB Map on a Port.................................................................................................................................... 253
Conguring PFC without a DCB Map.........................................................................................................................254
Conguring Lossless QueuesExample:..................................................................................................................254
Priority-Based Flow Control Using Dynamic Buer Method................................................................................... 256
Pause and Resume of Trac..................................................................................................................................256
Buer Sizes for Lossless or PFC Packets............................................................................................................ 256
Behavior of Tagged Packets.........................................................................................................................................257
Conguration Example for DSCP and PFC Priorities................................................................................................257
Using PFC to Manage Converged Ethernet Trac.................................................................................................. 258
Congure Enhanced Transmission Selection..............................................................................................................258
ETS Prerequisites and Restrictions....................................................................................................................... 258
Creating an ETS Priority Group............................................................................................................................. 258
ETS Operation with DCBx......................................................................................................................................260
Conguring Bandwidth Allocation for DCBx CIN................................................................................................ 260
Conguring ETS in a DCB Map.............................................................................................................................. 261
Hierarchical Scheduling in ETS Output Policies......................................................................................................... 262
Using ETS to Manage Converged Ethernet Trac...................................................................................................263
Applying DCB Policies in a Switch Stack.................................................................................................................... 263
Congure a DCBx Operation........................................................................................................................................263
DCBx Operation....................................................................................................................................................... 263
DCBx Port Roles...................................................................................................................................................... 264
DCB Conguration Exchange................................................................................................................................ 265
Conguration Source Election............................................................................................................................... 265
Propagation of DCB Information........................................................................................................................... 266
Auto-Detection and Manual Conguration of the DCBx Version...................................................................... 266
DCBx Example..........................................................................................................................................................267
DCBx Prerequisites and Restrictions.....................................................................................................................267
Conguring DCBx.................................................................................................................................................... 267
Verifying the DCB Conguration.................................................................................................................................. 271
QoS dot1p Trac Classication and Queue Assignment..........................................................................................280
Conguring the Dynamic Buer Method.................................................................................................................... 281
Sample DCB Conguration...........................................................................................................................................282
PFC and ETS Conguration Command Examples...............................................................................................284
Contents
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