Users Guide

Priority-Based Flow Control................................................................................................................................... 242
Enhanced Transmission Selection..........................................................................................................................243
Data Center Bridging Exchange Protocol (DCBx)...............................................................................................244
Data Center Bridging in a Trac Flow...................................................................................................................245
Enabling Data Center Bridging.....................................................................................................................................245
DCB Maps and its Attributes..................................................................................................................................246
Data Center Bridging: Default Conguration..............................................................................................................247
Conguring Priority-Based Flow Control.................................................................................................................... 247
Conguring Lossless Queues................................................................................................................................. 248
Conguring PFC in a DCB Map................................................................................................................................... 249
PFC Conguration Notes........................................................................................................................................249
PFC Prerequisites and Restrictions.......................................................................................................................250
Applying a DCB Map on a Port....................................................................................................................................250
Conguring PFC without a DCB Map..........................................................................................................................251
Conguring Lossless QueuesExample:...................................................................................................................251
Priority-Based Flow Control Using Dynamic Buer Method....................................................................................253
Pause and Resume of Trac..................................................................................................................................253
Buer Sizes for Lossless or PFC Packets............................................................................................................ 253
Behavior of Tagged Packets.........................................................................................................................................254
Conguration Example for DSCP and PFC Priorities................................................................................................254
Using PFC to Manage Converged Ethernet Trac.................................................................................................. 255
Congure Enhanced Transmission Selection............................................................................................................. 255
ETS Prerequisites and Restrictions....................................................................................................................... 255
Creating an ETS Priority Group............................................................................................................................. 255
ETS Operation with DCBx...................................................................................................................................... 257
Conguring Bandwidth Allocation for DCBx CIN.................................................................................................257
Conguring ETS in a DCB Map..............................................................................................................................258
Hierarchical Scheduling in ETS Output Policies.........................................................................................................259
Using ETS to Manage Converged Ethernet Trac...................................................................................................260
Applying DCB Policies in a Switch Stack.................................................................................................................... 260
Congure a DCBx Operation........................................................................................................................................260
DCBx Operation.......................................................................................................................................................260
DCBx Port Roles.......................................................................................................................................................261
DCB Conguration Exchange................................................................................................................................ 262
Conguration Source Election................................................................................................................................262
Propagation of DCB Information............................................................................................................................263
Auto-Detection and Manual Conguration of the DCBx Version...................................................................... 263
DCBx Example..........................................................................................................................................................264
DCBx Prerequisites and Restrictions.....................................................................................................................264
Conguring DCBx....................................................................................................................................................264
Verifying the DCB Conguration................................................................................................................................. 268
Sample DCB Conguration...........................................................................................................................................276
PFC and ETS Conguration Command Examples...............................................................................................278
QoS dot1p Trac Classication and Queue Assignment.......................................................................................... 278
Conguring the Dynamic Buer Method....................................................................................................................279
Contents
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