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