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Configuration Example for DSCP and PFC Priorities................................................................ 264
DCBx Example.............................................................................................................................265
DCBx Prerequisites and Restrictions..........................................................................................265
Configuring DCBx.......................................................................................................................266
Verifying the DCB Configuration......................................................................................................270
Generation of PFC for a Priority for Untagged Packets...................................................................281
Operations on Untagged Packets.................................................................................................... 281
Performing PFC Using DSCP Bits Instead of 802.1p Bits.................................................................281
PFC and ETS Configuration Examples.............................................................................................282
Using PFC and ETS to Manage Data Center Traffic........................................................................ 282
PFC and ETS Configuration Command Examples.................................................................... 284
Using PFC and ETS to Manage Converged Ethernet Traffic.....................................................284
Hierarchical Scheduling in ETS Output Policies........................................................................284
Priority-Based Flow Control Using Dynamic Buffer Method..........................................................285
Pause and Resume of Traffic......................................................................................................285
Buffer Sizes for Lossless or PFC Packets................................................................................... 286
Configuring the Dynamic Buffer Method........................................................................................286
Sample Configurations.....................................................................................................................289
.....................................................................................................................................................289
13 Debugging and Diagnostics......................................................................... 293
Offline Diagnostics........................................................................................................................... 293
Important Points to Remember................................................................................................. 293
Running Offline Diagnostics.......................................................................................................293
Examples of Running Offline Diagnostics..................................................................................295
TRACE Logs.......................................................................................................................................302
Auto Save on Reload, Crash, or Rollover...................................................................................303
Last Restart Reason...........................................................................................................................303
Line Card Restart Causes and Reasons......................................................................................303
show hardware Commands.............................................................................................................303
Environmental Monitoring................................................................................................................305
Display Power Supply Status...................................................................................................... 305
Display Fan Status.......................................................................................................................306
Display Transceiver Type............................................................................................................306
Recognize an Over-Temperature Condition............................................................................ 308
Troubleshoot an Over-Temperature Condition........................................................................309
Troubleshooting Packet Loss............................................................................................................311
Displaying Drop Counters........................................................................................................... 311
Displaying Dataplane Statistics................................................................................................... 313
Displaying Line-Card Counters.................................................................................................. 314
Accessing Application Core Dumps.................................................................................................315
Mini Core Dumps.............................................................................................................................. 316