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Table Of Contents
Show Commands............................................................................................................................................................ 228
Chapter 13: Data Center Bridging (DCB)....................................................................................230
Ethernet Enhancements in Data Center Bridging...................................................................................................230
Priority-Based Flow Control.................................................................................................................................... 231
Enhanced Transmission Selection.........................................................................................................................232
Data Center Bridging Exchange Protocol (DCBx)............................................................................................ 233
Data Center Bridging in a Traffic Flow................................................................................................................ 233
Enabling Data Center Bridging.....................................................................................................................................234
DCB Maps and its Attributes..................................................................................................................................234
Data Center Bridging: Default Configuration........................................................................................................... 235
Configuring Priority-Based Flow Control.................................................................................................................. 235
Configuring Lossless Queues................................................................................................................................. 236
Configuring PFC in a DCB Map................................................................................................................................... 237
Applying a DCB Map on a Port.................................................................................................................................... 238
Configuring PFC without a DCB Map........................................................................................................................ 239
Priority-Based Flow Control Using Dynamic Buffer Method............................................................................... 240
Behavior of Tagged Packets......................................................................................................................................... 241
Configuration Example for DSCP and PFC Priorities..............................................................................................241
Using PFC to Manage Converged Ethernet Traffic............................................................................................... 242
Configure Enhanced Transmission Selection........................................................................................................... 242
ETS Prerequisites and Restrictions...................................................................................................................... 243
Creating an ETS Priority Group............................................................................................................................. 243
ETS Operation with DCBx.......................................................................................................................................244
Configuring Bandwidth Allocation for DCBx CIN.............................................................................................. 244
Configuring ETS in a DCB Map..............................................................................................................................245
Hierarchical Scheduling in ETS Output Policies...................................................................................................... 246
Using ETS to Manage Converged Ethernet Traffic............................................................................................... 246
Applying DCB Policies in a Switch Stack...................................................................................................................247
Configure a DCBx Operation........................................................................................................................................ 247
DCBx Operation.........................................................................................................................................................247
DCBx Port Roles........................................................................................................................................................247
DCB Configuration Exchange.................................................................................................................................249
Configuration Source Election............................................................................................................................... 249
Propagation of DCB Information...........................................................................................................................249
Auto-Detection and Manual Configuration of the DCBx Version..................................................................250
DCBx Example........................................................................................................................................................... 250
DCBx Prerequisites and Restrictions.................................................................................................................... 251
Configuring DCBx...................................................................................................................................................... 251
Verifying the DCB Configuration.................................................................................................................................254
Sample DCB Configuration...........................................................................................................................................262
QoS dot1p Traffic Classification and Queue Assignment......................................................................................264
Configuring the Dynamic Buffer Method..................................................................................................................265
Chapter 14: Dynamic Host Configuration Protocol (DHCP)........................................................ 267
DHCP Packet Format and Options.............................................................................................................................267
Assign an IP Address using DHCP.............................................................................................................................. 268
Implementation Information......................................................................................................................................... 269
Configuration Tasks....................................................................................................................................................... 269
Contents
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