Users Guide

Behavior of Tagged Packets...................................................................................................................................271
Configuration Example for DSCP and PFC Priorities..........................................................................................272
DCBx Example..........................................................................................................................................................272
DCBx Prerequisites and Restrictions.................................................................................................................... 273
Configuring DCBx.................................................................................................................................................... 274
Verifying the DCB Configuration................................................................................................................................. 277
Performing PFC Using DSCP Bits Instead of 802.1p Bits........................................................................................ 287
PFC and ETS Configuration Examples........................................................................................................................287
Using PFC and ETS to Manage Data Center Traffic................................................................................................288
PFC and ETS Configuration Command Examples.............................................................................................. 289
Using PFC and ETS to Manage Converged Ethernet Traffic........................................................................... 289
Hierarchical Scheduling in ETS Output Policies...................................................................................................290
Priority-Based Flow Control Using Dynamic Buffer Method...................................................................................290
Pause and Resume of Traffic.................................................................................................................................290
Buffer Sizes for Lossless or PFC Packets............................................................................................................ 291
Configuring the Dynamic Buffer Method....................................................................................................................291
12 Debugging and Diagnostics...................................................................................................................... 293
Offline Diagnostics.........................................................................................................................................................293
Running Port Extender Offline Diagnostics on the Switch................................................................................293
Running Offline Diagnostics on a Standalone Switch.........................................................................................300
TRACE Logs...................................................................................................................................................................320
Auto Save on Reload, Crash, or Rollover.............................................................................................................. 321
Uploading Trace Logs.............................................................................................................................................. 321
Last Restart Reason.......................................................................................................................................................321
show hardware Commands..........................................................................................................................................322
Environmental Monitoring............................................................................................................................................ 324
Displaying Port Extender Environment Information ...........................................................................................324
Display Power Supply Status................................................................................................................................. 324
Display Fan Status...................................................................................................................................................325
Display Transceiver Type........................................................................................................................................325
Recognize an Over-Temperature Condition........................................................................................................ 327
Troubleshoot an Over-Temperature Condition................................................................................................... 328
Troubleshooting Packet Loss.......................................................................................................................................330
Displaying Drop Counters....................................................................................................................................... 330
Displaying Dataplane Statistics...............................................................................................................................331
Displaying Line-Card Counters...............................................................................................................................333
Accessing Application Core Dumps.............................................................................................................................333
Mini Core Dumps........................................................................................................................................................... 334
Full Kernel Core Dumps................................................................................................................................................ 335
Enabling TCP Dumps.................................................................................................................................................... 335
Accessing Port Extender Core and Mini Core Dumps..............................................................................................336
13 Dynamic Host Configuration Protocol (DHCP).........................................................................................337
DHCP Packet Format and Options............................................................................................................................. 337
Assign an IP Address using DHCP...............................................................................................................................339
10
Contents