Users Guide

Viewing Per-Protocol CoPP Counters........................................................................................................ 240
Viewing Per-Queue CoPP Counters............................................................................................................243
11 Data Center Bridging (DCB)............................................................................................................................ 244
Enabling Data Center Bridging............................................................................................................................244
Ethernet Enhancements in Data Center Bridging...........................................................................................245
Priority-Based Flow Control.......................................................................................................................... 246
Enhanced Transmission Selection................................................................................................................247
Data Center Bridging Exchange Protocol (DCBx).....................................................................................248
Data Center Bridging in a Traffic Flow.........................................................................................................248
QoS dot1p Traffic Classification and Queue Assignment............................................................................. 249
SNMP Support for PFC and Buffer Statistics Tracking................................................................................... 249
DCB Maps and its Attributes................................................................................................................................ 250
DCB Map: Configuration Procedure............................................................................................................250
Important Points to Remember.....................................................................................................................251
Applying a DCB Map on a Port...................................................................................................................... 251
Configuring PFC without a DCB Map.......................................................................................................... 252
Configuring Lossless Queues........................................................................................................................ 252
Applying a DCB Map on a Line Card............................................................................................................ 253
Data Center Bridging: Default Configuration...................................................................................................253
Configuration Notes: PFC and ETS in a DCB Map..........................................................................................254
PFC Configuration Notes................................................................................................................................254
ETS Configuration Notes................................................................................................................................ 255
ETS Prerequisites and Restrictions................................................................................................................256
Priority-Group Configuration Notes............................................................................................................ 256
Configuring Priority-Based Flow Control......................................................................................................... 256
Configuring Lossless Queues........................................................................................................................ 257
Configuring Enhanced Transmission Selection...............................................................................................258
Creating an ETS Priority Group..................................................................................................................... 258
ETS Operation with DCBx.............................................................................................................................. 259
Configure a DCBx Operation.............................................................................................................................. 259
DCBx Operation............................................................................................................................................... 260
DCBx Port Roles...............................................................................................................................................260
DCB Configuration Exchange........................................................................................................................261
Configuration Source Election......................................................................................................................262
Propagation of DCB Information..................................................................................................................262
Auto-Detection and Manual Configuration of the DCBx Version.........................................................262
Behavior of Tagged Packets.......................................................................................................................... 263
Configuration Example for DSCP and PFC Priorities................................................................................263
DCBx Example.................................................................................................................................................. 265
DCBx Prerequisites and Restrictions............................................................................................................265
Configuring DCBx............................................................................................................................................266
Verifying the DCB Configuration........................................................................................................................269
Performing PFC Using DSCP Bits Instead of 802.1p Bits...............................................................................279
PFC and ETS Configuration Examples...............................................................................................................279
Using PFC and ETS to Manage Data Center Traffic........................................................................................279
PFC and ETS Configuration Command Examples.....................................................................................281
Contents
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