Administrator Guide

Priority-Based Flow Control................................................................................................................................... 244
Enhanced Transmission Selection..........................................................................................................................245
Data Center Bridging Exchange Protocol (DCBx)...............................................................................................246
Data Center Bridging in a Trac Flow...................................................................................................................247
Enabling Data Center Bridging..................................................................................................................................... 247
DCB Maps and its Attributes..................................................................................................................................248
Data Center Bridging: Default Conguration..............................................................................................................249
Conguring Priority-Based Flow Control....................................................................................................................249
Conguring Lossless Queues................................................................................................................................. 250
Conguring PFC in a DCB Map....................................................................................................................................251
PFC Conguration Notes........................................................................................................................................ 251
PFC Prerequisites and Restrictions....................................................................................................................... 252
Applying a DCB Map on a Port.................................................................................................................................... 252
Conguring PFC without a DCB Map.........................................................................................................................253
Conguring Lossless QueuesExample:..................................................................................................................253
Priority-Based Flow Control Using Dynamic Buer Method................................................................................... 255
Pause and Resume of Trac..................................................................................................................................255
Buer Sizes for Lossless or PFC Packets............................................................................................................ 255
Behavior of Tagged Packets.........................................................................................................................................256
Conguration Example for DSCP and PFC Priorities................................................................................................256
Using PFC to Manage Converged Ethernet Trac...................................................................................................257
Congure Enhanced Transmission Selection..............................................................................................................257
ETS Prerequisites and Restrictions........................................................................................................................257
Creating an ETS Priority Group..............................................................................................................................257
ETS Operation with DCBx......................................................................................................................................259
Conguring Bandwidth Allocation for DCBx CIN................................................................................................ 259
Conguring ETS in a DCB Map..............................................................................................................................260
Hierarchical Scheduling in ETS Output Policies..........................................................................................................261
Using ETS to Manage Converged Ethernet Trac...................................................................................................262
Applying DCB Policies in a Switch Stack.................................................................................................................... 262
Congure a DCBx Operation........................................................................................................................................262
DCBx Operation....................................................................................................................................................... 262
DCBx Port Roles...................................................................................................................................................... 263
DCB Conguration Exchange................................................................................................................................ 264
Conguration Source Election................................................................................................................................264
Propagation of DCB Information........................................................................................................................... 265
Auto-Detection and Manual Conguration of the DCBx Version...................................................................... 265
DCBx Example......................................................................................................................................................... 266
DCBx Prerequisites and Restrictions.....................................................................................................................266
Conguring DCBx....................................................................................................................................................266
Verifying the DCB Conguration..................................................................................................................................270
Sample DCB Conguration........................................................................................................................................... 278
PFC and ETS Conguration Command Examples...............................................................................................280
QoS dot1p Trac Classication and Queue Assignment..........................................................................................280
Conguring the Dynamic Buer Method.................................................................................................................... 281
Contents
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