Users Guide

Ethernet Enhancements in Data Center Bridging...........................................................254
Priority-Based Flow Control.......................................................................................... 256
Enhanced Transmission Selection................................................................................257
Data Center Bridging Exchange Protocol (DCBx).....................................................258
Data Center Bridging in a Traffic Flow.........................................................................259
Enabling Data Center Bridging............................................................................................259
DCB Maps and its Attributes.......................................................................................... 260
Data Center Bridging: Default Configuration...................................................................261
Configuring Priority-Based Flow Control......................................................................... 262
Configuring Lossless Queues........................................................................................263
Configuring PFC in a DCB Map...........................................................................................265
PFC Configuration Notes............................................................................................... 265
PFC Prerequisites and Restrictions...............................................................................266
Applying a DCB Map on a Port............................................................................................266
Configuring PFC without a DCB Map................................................................................267
Configuring Lossless QueuesExample:.......................................................................268
Priority-Based Flow Control Using Dynamic Buffer Method....................................... 269
Pause and Resume of Traffic......................................................................................... 270
Buffer Sizes for Lossless or PFC Packets.....................................................................270
Behavior of Tagged Packets.................................................................................................271
Configuration Example for DSCP and PFC Priorities...................................................... 271
SNMP Support for PFC and Buffer Statistics Tracking....................................................272
Performing PFC Using DSCP Bits Instead of 802.1p Bits...............................................273
PFC and ETS Configuration Examples...............................................................................274
Using PFC to Manage Converged Ethernet Traffic.........................................................274
Operations on Untagged Packets.......................................................................................274
Generation of PFC for a Priority for Untagged Packets................................................. 275
Configure Enhanced Transmission Selection.................................................................. 275
ETS Prerequisites and Restrictions................................................................................275
Creating an ETS Priority Group..................................................................................... 276
ETS Operation with DCBx...............................................................................................277
Configuring Bandwidth Allocation for DCBx CIN..................................................... 278
Configuring ETS in a DCB Map......................................................................................279
Hierarchical Scheduling in ETS Output Policies..............................................................280
Using ETS to Manage Converged Ethernet Traffic..........................................................281
Applying DCB Policies in a Switch Stack........................................................................... 281
Configure a DCBx Operation.............................................................................................. 282
DCBx Operation............................................................................................................... 282
DCBx Port Roles............................................................................................................... 282
DCB Configuration Exchange....................................................................................... 284
Configuration Source Election......................................................................................285
Propagation of DCB Information..................................................................................285
9.10(0.1)
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