Priority-Based Flow Control.......................................................................................................247
Enhanced Transmission Selection.............................................................................................249
Data Center Bridging Exchange Protocol (DCBx).....................................................................250
Data Center Bridging in a Traffic Flow.......................................................................................250
Enabling Data Center Bridging.........................................................................................................251
DCB Maps and its Attributes........................................................................................................251
Data Center Bridging: Default Configuration..................................................................................252
Configuring Priority-Based Flow Control........................................................................................253
Configuring Lossless Queues.....................................................................................................254
Configuring PFC in a DCB Map........................................................................................................255
PFC Configuration Notes............................................................................................................255
PFC Prerequisites and Restrictions.............................................................................................257
Applying a DCB Map on a Port.........................................................................................................257
Configuring PFC without a DCB Map..............................................................................................257
Configuring Lossless QueuesExample:......................................................................................258
Priority-Based Flow Control Using Dynamic Buffer Method.........................................................260
Pause and Resume of Traffic......................................................................................................260
Buffer Sizes for Lossless or PFC Packets...................................................................................260
Behavior of Tagged Packets.............................................................................................................261
Configuration Example for DSCP and PFC Priorities......................................................................262
SNMP Support for PFC and Buffer Statistics Tracking.....................................................................262
Performing PFC Using DSCP Bits Instead of 802.1p Bits................................................................263
PFC and ETS Configuration Examples.............................................................................................264
Using PFC to Manage Converged Ethernet Traffic.........................................................................264
Operations on Untagged Packets....................................................................................................264
Generation of PFC for a Priority for Untagged Packets..................................................................265
Configure Enhanced Transmission Selection..................................................................................265
ETS Prerequisites and Restrictions.............................................................................................265
Creating an ETS Priority Group..................................................................................................266
ETS Operation with DCBx...........................................................................................................267
Configuring Bandwidth Allocation for DCBx CIN.....................................................................268
Configuring ETS in a DCB Map..................................................................................................269
Hierarchical Scheduling in ETS Output Policies..............................................................................270
Using ETS to Manage Converged Ethernet Traffic..........................................................................271
Applying DCB Policies in a Switch Stack..........................................................................................271
Configure a DCBx Operation............................................................................................................271
DCBx Operation..........................................................................................................................272
DCBx Port Roles..........................................................................................................................272
DCB Configuration Exchange....................................................................................................274
Configuration Source Election...................................................................................................274
Propagation of DCB Information................................................................................................275
Auto-Detection and Manual Configuration of the DCBx Version............................................275
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