Users Guide

Enhanced Transmission Selection..........................................................................................................................241
Data Center Bridging Exchange Protocol (DCBx).............................................................................................. 242
Data Center Bridging in a Traffic Flow................................................................................................................. 243
Enabling Data Center Bridging.....................................................................................................................................243
DCB Maps and its Attributes................................................................................................................................. 244
Data Center Bridging: Default Configuration.............................................................................................................245
Configuring Priority-Based Flow Control....................................................................................................................245
Configuring Lossless Queues................................................................................................................................. 246
Configuring PFC in a DCB Map................................................................................................................................... 247
PFC Configuration Notes....................................................................................................................................... 247
PFC Prerequisites and Restrictions.......................................................................................................................248
Applying a DCB Map on a Port.................................................................................................................................... 248
Configuring PFC without a DCB Map.........................................................................................................................249
Configuring Lossless QueuesExample:................................................................................................................. 249
Priority-Based Flow Control Using Dynamic Buffer Method....................................................................................251
Pause and Resume of Traffic................................................................................................................................. 251
Buffer Sizes for Lossless or PFC Packets............................................................................................................ 251
Behavior of Tagged Packets........................................................................................................................................252
Configuration Example for DSCP and PFC Priorities............................................................................................... 252
Using PFC to Manage Converged Ethernet Traffic................................................................................................. 253
Configure Enhanced Transmission Selection.............................................................................................................253
ETS Prerequisites and Restrictions.......................................................................................................................253
Creating an ETS Priority Group............................................................................................................................. 253
ETS Operation with DCBx......................................................................................................................................255
Configuring Bandwidth Allocation for DCBx CIN................................................................................................ 255
Configuring ETS in a DCB Map............................................................................................................................. 256
Hierarchical Scheduling in ETS Output Policies.........................................................................................................257
Using ETS to Manage Converged Ethernet Traffic..................................................................................................258
Applying DCB Policies in a Switch Stack....................................................................................................................258
Configure a DCBx Operation....................................................................................................................................... 258
DCBx Operation.......................................................................................................................................................258
DCBx Port Roles......................................................................................................................................................259
DCB Configuration Exchange................................................................................................................................ 260
Configuration Source Election...............................................................................................................................260
Propagation of DCB Information............................................................................................................................261
Auto-Detection and Manual Configuration of the DCBx Version...................................................................... 261
DCBx Example......................................................................................................................................................... 262
DCBx Prerequisites and Restrictions.................................................................................................................... 262
Configuring DCBx....................................................................................................................................................262
Verifying the DCB Configuration.................................................................................................................................266
Sample DCB Configuration...........................................................................................................................................274
PFC and ETS Configuration Command Examples...............................................................................................276
QoS dot1p Traffic Classification and Queue Assignment......................................................................................... 276
Configuring the Dynamic Buffer Method................................................................................................................... 277
13 Dynamic Host Configuration Protocol (DHCP).........................................................................................279
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