Users Guide

Enhanced Transmission Selection......................................................................................................................... 246
Data Center Bridging Exchange Protocol (DCBx).............................................................................................. 247
Data Center Bridging in a Traffic Flow................................................................................................................. 248
Enabling Data Center Bridging.....................................................................................................................................248
DCB Maps and its Attributes................................................................................................................................. 249
Data Center Bridging: Default Configuration.............................................................................................................250
Configuring Priority-Based Flow Control................................................................................................................... 250
Configuring Lossless Queues..................................................................................................................................251
Configuring PFC in a DCB Map................................................................................................................................... 252
PFC Configuration Notes....................................................................................................................................... 252
PFC Prerequisites and Restrictions.......................................................................................................................253
Applying a DCB Map on a Port....................................................................................................................................253
Configuring PFC without a DCB Map.........................................................................................................................254
Configuring Lossless QueuesExample:................................................................................................................. 254
Priority-Based Flow Control Using Dynamic Buffer Method...................................................................................256
Pause and Resume of Traffic.................................................................................................................................256
Buffer Sizes for Lossless or PFC Packets............................................................................................................256
Behavior of Tagged Packets........................................................................................................................................257
Configuration Example for DSCP and PFC Priorities................................................................................................257
Using PFC to Manage Converged Ethernet Traffic................................................................................................. 258
Configure Enhanced Transmission Selection.............................................................................................................258
ETS Prerequisites and Restrictions.......................................................................................................................258
Creating an ETS Priority Group............................................................................................................................. 258
ETS Operation with DCBx......................................................................................................................................260
Configuring Bandwidth Allocation for DCBx CIN................................................................................................ 260
Configuring ETS in a DCB Map.............................................................................................................................. 261
Hierarchical Scheduling in ETS Output Policies.........................................................................................................262
Using ETS to Manage Converged Ethernet Traffic..................................................................................................263
Applying DCB Policies in a Switch Stack....................................................................................................................263
Configure a DCBx Operation........................................................................................................................................263
DCBx Operation.......................................................................................................................................................263
DCBx Port Roles......................................................................................................................................................264
DCB Configuration Exchange................................................................................................................................ 265
Configuration Source Election...............................................................................................................................265
Propagation of DCB Information...........................................................................................................................266
Auto-Detection and Manual Configuration of the DCBx Version..................................................................... 266
DCBx Example..........................................................................................................................................................267
DCBx Prerequisites and Restrictions.................................................................................................................... 267
Configuring DCBx.................................................................................................................................................... 267
Verifying the DCB Configuration..................................................................................................................................271
QoS dot1p Traffic Classification and Queue Assignment.........................................................................................280
Configuring the Dynamic Buffer Method....................................................................................................................281
Sample DCB Configuration...........................................................................................................................................282
PFC and ETS Configuration Command Examples.............................................................................................. 284
13 Dynamic Host Configuration Protocol (DHCP)........................................................................................ 285
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