Concept Guide

Enabling Data Center Bridging.....................................................................................................................................280
DCB Maps and its Attributes.................................................................................................................................. 281
Data Center Bridging: Default Conguration..............................................................................................................282
Conguring Priority-Based Flow Control.................................................................................................................... 282
Conguring Lossless Queues................................................................................................................................. 283
Conguring PFC in a DCB Map................................................................................................................................... 284
PFC Conguration Notes........................................................................................................................................284
PFC Prerequisites and Restrictions.......................................................................................................................285
Applying a DCB Map on a Port....................................................................................................................................285
Conguring PFC without a DCB Map.........................................................................................................................286
Conguring Lossless QueuesExample:..................................................................................................................286
Priority-Based Flow Control Using Dynamic Buer Method....................................................................................288
Pause and Resume of Trac..................................................................................................................................288
Buer Sizes for Lossless or PFC Packets............................................................................................................ 288
Behavior of Tagged Packets.........................................................................................................................................289
Conguration Example for DSCP and PFC Priorities................................................................................................289
Using PFC to Manage Converged Ethernet Trac.................................................................................................. 290
Congure Enhanced Transmission Selection............................................................................................................. 290
ETS Prerequisites and Restrictions........................................................................................................................ 291
Creating an ETS Priority Group.............................................................................................................................. 291
ETS Operation with DCBx......................................................................................................................................292
Conguring Bandwidth Allocation for DCBx CIN.................................................................................................292
Conguring ETS in a DCB Map..............................................................................................................................293
Hierarchical Scheduling in ETS Output Policies.........................................................................................................295
Using ETS to Manage Converged Ethernet Trac...................................................................................................295
Applying DCB Policies in a Switch Stack....................................................................................................................295
Congure a DCBx Operation........................................................................................................................................295
DCBx Operation.......................................................................................................................................................296
DCBx Port Roles......................................................................................................................................................296
DCB Conguration Exchange.................................................................................................................................297
Conguration Source Election............................................................................................................................... 298
Propagation of DCB Information........................................................................................................................... 298
Auto-Detection and Manual Conguration of the DCBx Version...................................................................... 299
DCBx Example......................................................................................................................................................... 299
DCBx Prerequisites and Restrictions.................................................................................................................... 300
Conguring DCBx....................................................................................................................................................300
Verifying the DCB Conguration................................................................................................................................. 304
QoS dot1p Trac Classication and Queue Assignment...........................................................................................313
Conguring the Dynamic Buer Method.................................................................................................................... 314
Sample DCB Conguration........................................................................................................................................... 315
PFC and ETS Conguration Command Examples................................................................................................317
13 Dynamic Host Conguration Protocol (DHCP)..........................................................................................318
DHCP Packet Format and Options.............................................................................................................................. 318
Assign an IP Address using DHCP...............................................................................................................................320
Implementation Information.......................................................................................................................................... 321
Contents
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