Install Guide

Table Of Contents
Protocol to CPU Queue Mapping..........................................................................................................................238
Configuring Protocol to CPU Queue Mapping...................................................................................................239
Displaying CoPP Configuration .............................................................................................................................240
Chapter 12: Data Center Bridging (DCB)....................................................................................242
Ethernet Enhancements in Data Center Bridging...................................................................................................242
Priority-Based Flow Control................................................................................................................................... 243
Enhanced Transmission Selection.........................................................................................................................244
Data Center Bridging Exchange Protocol (DCBx)............................................................................................245
Data Center Bridging in a Traffic Flow................................................................................................................ 246
Buffer Organization.................................................................................................................................................. 246
Enabling Data Center Bridging.....................................................................................................................................249
DCB Maps and its Attributes................................................................................................................................. 249
Data Center Bridging: Default Configuration...........................................................................................................250
Configuring Priority-Based Flow Control.................................................................................................................. 250
Configuring Lossless Queues.................................................................................................................................. 251
Configuring PFC in a DCB Map................................................................................................................................... 252
Applying a DCB Map on a Port....................................................................................................................................253
Configuring PFC without a DCB Map........................................................................................................................254
Priority-Based Flow Control Using Dynamic Buffer Method............................................................................... 256
Shared headroom for lossless or PFC packets........................................................................................................257
Configuring Shared Head Room Buffer...............................................................................................................258
Viewing Shared Head Room Usage...................................................................................................................... 258
Monitoring Buffer Statistics for Tracking Purposes.........................................................................................259
Behavior of Tagged Packets........................................................................................................................................259
Configuration Example for DSCP and PFC Priorities.............................................................................................259
SNMP Support for PFC and Buffer Statistics Tracking....................................................................................... 260
Performing PFC Using DSCP Bits Instead of 802.1p Bits..................................................................................... 261
PFC and ETS Configuration Examples.......................................................................................................................263
Using PFC to Manage Converged Ethernet Traffic...............................................................................................263
Operations on Untagged Packets...............................................................................................................................263
Generation of PFC for a Priority for Untagged Packets.......................................................................................264
Configure Enhanced Transmission Selection........................................................................................................... 264
Creating an ETS Priority Group............................................................................................................................. 264
ETS Operation with DCBx...................................................................................................................................... 265
Configuring ETS in a DCB Map............................................................................................................................. 265
Hierarchical Scheduling in ETS Output Policies...................................................................................................... 266
Using ETS to Manage Converged Ethernet Traffic................................................................................................267
Applying DCB Policies in a Switch Stack...................................................................................................................267
Configure a DCBx Operation........................................................................................................................................267
DCBx Operation.........................................................................................................................................................268
DCBx Port Roles........................................................................................................................................................268
DCB Configuration Exchange................................................................................................................................ 269
Configuration Source Election............................................................................................................................... 269
Propagation of DCB Information........................................................................................................................... 270
Auto-Detection and Manual Configuration of the DCBx Version..................................................................270
DCBx Example............................................................................................................................................................270
DCBx Prerequisites and Restrictions.................................................................................................................... 271
Configuring DCBx.......................................................................................................................................................271
Verifying the DCB Configuration.................................................................................................................................275
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