Concept Guide

Enabling Data Center Bridging..................................................................................................................................... 276
DCB Maps and its Attributes.................................................................................................................................. 277
Data Center Bridging: Default Conguration..............................................................................................................278
Conguring Priority-Based Flow Control.................................................................................................................... 278
Conguring Lossless Queues..................................................................................................................................279
Conguring PFC in a DCB Map................................................................................................................................... 280
PFC Conguration Notes....................................................................................................................................... 280
PFC Prerequisites and Restrictions........................................................................................................................281
Applying a DCB Map on a Port.....................................................................................................................................281
Conguring PFC without a DCB Map.........................................................................................................................282
Conguring Lossless QueuesExample:..................................................................................................................282
Priority-Based Flow Control Using Dynamic Buer Method....................................................................................284
Pause and Resume of Trac..................................................................................................................................284
Buer Sizes for Lossless or PFC Packets.............................................................................................................284
Behavior of Tagged Packets.........................................................................................................................................285
Conguration Example for DSCP and PFC Priorities................................................................................................285
Using PFC to Manage Converged Ethernet Trac...................................................................................................286
Congure Enhanced Transmission Selection..............................................................................................................286
ETS Prerequisites and Restrictions........................................................................................................................287
Creating an ETS Priority Group..............................................................................................................................287
ETS Operation with DCBx......................................................................................................................................288
Conguring Bandwidth Allocation for DCBx CIN.................................................................................................288
Conguring ETS in a DCB Map..............................................................................................................................289
Hierarchical Scheduling in ETS Output Policies..........................................................................................................291
Using ETS to Manage Converged Ethernet Trac....................................................................................................291
Applying DCB Policies in a Switch Stack.....................................................................................................................291
Congure a DCBx Operation.........................................................................................................................................291
DCBx Operation....................................................................................................................................................... 292
DCBx Port Roles...................................................................................................................................................... 292
DCB Conguration Exchange................................................................................................................................ 293
Conguration Source Election................................................................................................................................294
Propagation of DCB Information............................................................................................................................294
Auto-Detection and Manual Conguration of the DCBx Version...................................................................... 295
DCBx Example......................................................................................................................................................... 295
DCBx Prerequisites and Restrictions.....................................................................................................................296
Conguring DCBx....................................................................................................................................................296
Verifying the DCB Conguration................................................................................................................................. 300
QoS dot1p Trac Classication and Queue Assignment..........................................................................................309
Conguring the Dynamic Buer Method.................................................................................................................... 310
Sample DCB Conguration............................................................................................................................................ 311
PFC and ETS Conguration Command Examples............................................................................................... 313
13 Dynamic Host Conguration Protocol (DHCP)..........................................................................................314
DHCP Packet Format and Options.............................................................................................................................. 314
Assign an IP Address using DHCP................................................................................................................................316
Implementation Information...........................................................................................................................................317
Contents
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