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Troubleshooting CPU Packet Loss.............................................................................................234
Viewing Per-Protocol CoPP Counters.......................................................................................237
Viewing Per-Queue CoPP Counters..........................................................................................239
12 Data Center Bridging (DCB)..........................................................................241
Ethernet Enhancements in Data Center Bridging............................................................................241
Priority-Based Flow Control.......................................................................................................242
Enhanced Transmission Selection............................................................................................. 243
Data Center Bridging Exchange Protocol (DCBx).....................................................................244
Data Center Bridging in a Traffic Flow.......................................................................................245
Enabling Data Center Bridging.........................................................................................................245
QoS dot1p Traffic Classification and Queue Assignment...............................................................246
SNMP Support for PFC and Buffer Statistics Tracking.................................................................... 246
DCB Maps and its Attributes.............................................................................................................247
DCB Map: Configuration Procedure..........................................................................................247
Important Points to Remember................................................................................................. 248
Applying a DCB Map on a Port...................................................................................................248
Configuring PFC without a DCB Map........................................................................................ 249
Configuring Lossless Queues.....................................................................................................249
Data Center Bridging: Default Configuration..................................................................................250
Configuring PFC and ETS in a DCB Map..........................................................................................251
PFC Configuration Notes............................................................................................................251
PFC Prerequisites and Restrictions.............................................................................................252
ETS Configuration Notes............................................................................................................ 252
ETS Prerequisites and Restrictions............................................................................................. 253
Configuring Priority-Based Flow Control........................................................................................254
Configuring Lossless Queues.....................................................................................................255
Configure Enhanced Transmission Selection..................................................................................256
ETS Prerequisites and Restrictions............................................................................................. 256
Creating an ETS Priority Group.................................................................................................. 256
ETS Operation with DCBx...........................................................................................................257
Configuring Bandwidth Allocation for DCBx CIN..................................................................... 258
Applying the DCB Policies on Linecard........................................................................................... 259
Applying DCB Policies on SFM Ports............................................................................................... 259
Configure a DCBx Operation........................................................................................................... 259
DCBx Operation..........................................................................................................................260
DCBx Port Roles......................................................................................................................... 260
DCB Configuration Exchange.................................................................................................... 262
Configuration Source Election...................................................................................................262
Propagation of DCB Information............................................................................................... 263
Auto-Detection and Manual Configuration of the DCBx Version............................................263
Behavior of Tagged Packets.......................................................................................................264