Setup Guide

PFC Prerequisites and Restrictions....................................................................................................................... 277
Applying a DCB Map on a Port.................................................................................................................................... 278
Conguring PFC without a DCB Map.........................................................................................................................278
Conguring Lossless QueuesExample:..................................................................................................................279
Priority-Based Flow Control Using Dynamic Buer Method....................................................................................280
Pause and Resume of Trac..................................................................................................................................280
Buer Sizes for Lossless or PFC Packets............................................................................................................ 280
Shared headroom for lossless or PFC packets........................................................................................................... 281
Example Scenario.................................................................................................................................................... 282
Conguring Shared Head Room Buer................................................................................................................ 283
Viewing Shared Head Room Usage.......................................................................................................................283
Monitoring Buer Statistics for Tracking Purposes............................................................................................ 284
Behavior of Tagged Packets.........................................................................................................................................284
Conguration Example for DSCP and PFC Priorities................................................................................................284
SNMP Support for PFC and Buer Statistics Tracking............................................................................................285
Performing PFC Using DSCP Bits Instead of 802.1p Bits.........................................................................................286
PFC and ETS Conguration Examples........................................................................................................................287
Using PFC to Manage Converged Ethernet Trac...................................................................................................287
Operations on Untagged Packets................................................................................................................................ 287
Generation of PFC for a Priority for Untagged Packets...........................................................................................288
Congure Enhanced Transmission Selection..............................................................................................................288
Creating an ETS Priority Group..............................................................................................................................288
ETS Operation with DCBx......................................................................................................................................289
Conguring ETS in a DCB Map............................................................................................................................. 290
Hierarchical Scheduling in ETS Output Policies..........................................................................................................291
Using ETS to Manage Converged Ethernet Trac...................................................................................................292
Applying DCB Policies in a Switch Stack.................................................................................................................... 292
Congure a DCBx Operation........................................................................................................................................292
DCBx Operation....................................................................................................................................................... 292
DCBx Port Roles...................................................................................................................................................... 293
DCB Conguration Exchange................................................................................................................................ 294
Conguration Source Election................................................................................................................................294
Propagation of DCB Information........................................................................................................................... 295
Auto-Detection and Manual Conguration of the DCBx Version...................................................................... 295
DCBx Example......................................................................................................................................................... 296
DCBx Prerequisites and Restrictions.....................................................................................................................296
Conguring DCBx....................................................................................................................................................296
Verifying the DCB Conguration................................................................................................................................. 300
QoS dot1p Trac Classication and Queue Assignment..........................................................................................308
Conguring the Dynamic Buer Method................................................................................................................... 308
Sample DCB Conguration...........................................................................................................................................309
PFC and ETS Conguration Command Examples................................................................................................ 311
13 Dynamic Host Conguration Protocol (DHCP)..........................................................................................312
DHCP Packet Format and Options.............................................................................................................................. 312
Assign an IP Address using DHCP................................................................................................................................314
Contents
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