Setup Guide

Enhanced Transmission Selection...........................................................................................................................271
Data Center Bridging Exchange Protocol (DCBx)...............................................................................................272
Data Center Bridging in a Trac Flow...................................................................................................................273
Buer Organization..................................................................................................................................................273
Enabling Data Center Bridging..................................................................................................................................... 275
DCB Maps and its Attributes..................................................................................................................................276
Data Center Bridging: Default Conguration..............................................................................................................276
Conguring Priority-Based Flow Control.................................................................................................................... 277
Conguring Lossless Queues..................................................................................................................................278
Conguring PFC in a DCB Map................................................................................................................................... 279
PFC Conguration Notes........................................................................................................................................279
PFC Prerequisites and Restrictions.......................................................................................................................280
Applying a DCB Map on a Port....................................................................................................................................280
Conguring PFC without a DCB Map..........................................................................................................................281
Conguring PFC Asymmetric....................................................................................................................................... 281
Priority-Based Flow Control Using Dynamic Buer Method....................................................................................282
Pause and Resume of Trac..................................................................................................................................282
Buer Sizes for Lossless or PFC Packets.............................................................................................................282
Shared headroom for lossless or PFC packets.......................................................................................................... 283
Example Scenario.................................................................................................................................................... 283
Conguring Shared Head Room Buer................................................................................................................ 285
Viewing Shared Head Room Usage.......................................................................................................................285
Monitoring Buer Statistics for Tracking Purposes............................................................................................ 285
Behavior of Tagged Packets.........................................................................................................................................286
Conguration Example for DSCP and PFC Priorities................................................................................................286
SNMP Support for PFC and Buer Statistics Tracking............................................................................................287
Performing PFC Using DSCP Bits Instead of 802.1p Bits......................................................................................... 287
PFC and ETS Conguration Examples........................................................................................................................288
Using PFC to Manage Converged Ethernet Trac...................................................................................................288
Operations on Untagged Packets................................................................................................................................288
Generation of PFC for a Priority for Untagged Packets...........................................................................................289
Congure Enhanced Transmission Selection..............................................................................................................289
Creating an ETS Priority Group..............................................................................................................................289
ETS Operation with DCBx......................................................................................................................................290
Conguring ETS in a DCB Map.............................................................................................................................. 291
Hierarchical Scheduling in ETS Output Policies......................................................................................................... 292
Using ETS to Manage Converged Ethernet Trac...................................................................................................292
Applying DCB Policies in a Switch Stack.................................................................................................................... 292
Congure a DCBx Operation........................................................................................................................................293
DCBx Operation....................................................................................................................................................... 293
DCBx Port Roles...................................................................................................................................................... 293
DCB Conguration Exchange................................................................................................................................ 295
Conguration Source Election............................................................................................................................... 295
Propagation of DCB Information........................................................................................................................... 296
Auto-Detection and Manual Conguration of the DCBx Version...................................................................... 296
Contents
9