Priority-Based Flow Control....................................................................................................... 238Enhanced Transmission Selection............................................................................................. 240Data Center Bridging Exchange Protocol (DCBx)......................................................................241Data Center Bridging in a Traffic Flow....................................................................................... 241Enabling Data Center Bridging.........................................................................................................242DCB Maps and its Attributes....................................................................................................... 242Data Center Bridging: Default Configuration.................................................................................. 243Configuring Priority-Based Flow Control........................................................................................244Configuring Lossless Queues..................................................................................................... 245Configuring PFC in a DCB Map........................................................................................................246PFC Configuration Notes........................................................................................................... 246PFC Prerequisites and Restrictions.............................................................................................247Applying a DCB Map on a Port.........................................................................................................248Configuring PFC without a DCB Map.............................................................................................. 248Configuring Lossless QueuesExample:......................................................................................249Priority-Based Flow Control Using Dynamic Buffer Method..........................................................250Pause and Resume of Traffic...................................................................................................... 251Buffer Sizes for Lossless or PFC Packets.................................................................................... 251Behavior of Tagged Packets............................................................................................................. 252Configuration Example for DSCP and PFC Priorities...................................................................... 252SNMP Support for PFC and Buffer Statistics Tracking.....................................................................253Performing PFC Using DSCP Bits Instead of 802.1p Bits................................................................ 254PFC and ETS Configuration Examples............................................................................................. 255Using PFC to Manage Converged Ethernet Traffic......................................................................... 255Operations on Untagged Packets.................................................................................................... 255Generation of PFC for a Priority for Untagged Packets.................................................................. 255Configure Enhanced Transmission Selection..................................................................................256ETS Prerequisites and Restrictions............................................................................................. 256Creating an ETS Priority Group.................................................................................................. 256ETS Operation with DCBx........................................................................................................... 257Configuring Bandwidth Allocation for DCBx CIN..................................................................... 258Configuring ETS in a DCB Map...................................................................................................259Hierarchical Scheduling in ETS Output Policies..............................................................................260Using ETS to Manage Converged Ethernet Traffic.......................................................................... 261Applying DCB Policies in a Switch Stack..........................................................................................261Configure a DCBx Operation............................................................................................................261DCBx Operation..........................................................................................................................262DCBx Port Roles..........................................................................................................................262DCB Configuration Exchange.................................................................................................... 264Configuration Source Election...................................................................................................264Propagation of DCB Information............................................................................................... 265Auto-Detection and Manual Configuration of the DCBx Version............................................ 2659
