Setup Guide

Conguring CoPP for CPU Queues.......................................................................................................................274
Protocol to CPU Queue Mapping.......................................................................................................................... 275
Conguring Protocol to CPU Queue Mapping.....................................................................................................275
Displaying CoPP Conguration ............................................................................................................................. 276
12 Data Center Bridging (DCB)..................................................................................................................... 278
Ethernet Enhancements in Data Center Bridging......................................................................................................278
Priority-Based Flow Control................................................................................................................................... 279
Enhanced Transmission Selection..........................................................................................................................280
Data Center Bridging Exchange Protocol (DCBx)................................................................................................281
Data Center Bridging in a Trac Flow...................................................................................................................282
Enabling Data Center Bridging..................................................................................................................................... 282
DCB Maps and its Attributes..................................................................................................................................283
Data Center Bridging: Default Conguration..............................................................................................................283
Conguring Priority-Based Flow Control....................................................................................................................284
Conguring Lossless Queues................................................................................................................................. 285
Conguring PFC in a DCB Map................................................................................................................................... 286
PFC Conguration Notes........................................................................................................................................286
PFC Prerequisites and Restrictions....................................................................................................................... 287
Applying a DCB Map on a Port.....................................................................................................................................287
Conguring PFC without a DCB Map.........................................................................................................................288
Conguring PFC Asymmetric.......................................................................................................................................288
Priority-Based Flow Control Using Dynamic Buer Method....................................................................................289
Pause and Resume of Trac..................................................................................................................................289
Buer Sizes for Lossless or PFC Packets............................................................................................................ 289
Shared headroom for lossless or PFC packets.......................................................................................................... 290
Example Scenario.................................................................................................................................................... 290
Conguring Shared Head Room Buer................................................................................................................ 292
Viewing Shared Head Room Usage.......................................................................................................................292
Monitoring Buer Statistics for Tracking Purposes............................................................................................ 292
Behavior of Tagged Packets.........................................................................................................................................293
SNMP Support for PFC and Buer Statistics Tracking............................................................................................293
Performing PFC Using DSCP Bits Instead of 802.1p Bits.........................................................................................294
Conguration Example for DSCP and PFC Priorities................................................................................................295
Using PFC to Manage Converged Ethernet Trac.................................................................................................. 295
Generation of PFC for a Priority for Untagged Packets...........................................................................................295
Congure Enhanced Transmission Selection............................................................................................................. 295
Creating an ETS Priority Group............................................................................................................................. 296
ETS Operation with DCBx...................................................................................................................................... 297
Conguring ETS in a DCB Map..............................................................................................................................297
Hierarchical Scheduling in ETS Output Policies.........................................................................................................298
Using ETS to Manage Converged Ethernet Trac...................................................................................................299
Applying DCB Policies in a Switch Stack.................................................................................................................... 299
Congure a DCBx Operation........................................................................................................................................299
DCBx Operation.......................................................................................................................................................300
DCBx Port Roles......................................................................................................................................................300
Contents
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