Administrator Guide

Priority-Based Flow Control.......................................................................................................................................227
Enhanced Transmission Selection.............................................................................................................................228
Data Center Bridging Exchange Protocol (DCBx)..................................................................................................229
Data Center Bridging in a Traffic Flow..................................................................................................................... 229
Enabling Data Center Bridging........................................................................................................................................ 230
DCB Maps and its Attributes..................................................................................................................................... 230
Data Center Bridging: Default Configuration..................................................................................................................231
Configuring Priority-Based Flow Control........................................................................................................................ 231
Configuring Lossless Queues..................................................................................................................................... 232
Configuring PFC in a DCB Map.......................................................................................................................................233
Applying a DCB Map on a Port........................................................................................................................................234
Configuring PFC without a DCB Map............................................................................................................................ 235
Configuring PFC Asymmetric.......................................................................................................................................... 236
Priority-Based Flow Control Using Dynamic Buffer Method.......................................................................................236
Behavior of Tagged Packets............................................................................................................................................237
Configuration Example for DSCP and PFC Priorities................................................................................................... 238
SNMP Support for PFC and Buffer Statistics Tracking.............................................................................................. 238
Performing PFC Using DSCP Bits Instead of 802.1p Bits............................................................................................239
PFC and ETS Configuration Examples...........................................................................................................................240
Using PFC to Manage Converged Ethernet Traffic.....................................................................................................240
Operations on Untagged Packets...................................................................................................................................240
Generation of PFC for a Priority for Untagged Packets...............................................................................................241
Configure Enhanced Transmission Selection................................................................................................................. 241
ETS Prerequisites and Restrictions............................................................................................................................241
Creating an ETS Priority Group..................................................................................................................................241
ETS Operation with DCBx..........................................................................................................................................242
Configuring Bandwidth Allocation for DCBx CIN.................................................................................................... 242
Configuring ETS in a DCB Map................................................................................................................................. 243
Hierarchical Scheduling in ETS Output Policies............................................................................................................ 244
Using ETS to Manage Converged Ethernet Traffic..................................................................................................... 244
Applying DCB Policies in a Switch Stack....................................................................................................................... 245
Configure a DCBx Operation........................................................................................................................................... 245
DCBx Operation...........................................................................................................................................................245
DCBx Port Roles..........................................................................................................................................................245
DCB Configuration Exchange.................................................................................................................................... 247
Configuration Source Election................................................................................................................................... 247
Propagation of DCB Information............................................................................................................................... 247
Auto-Detection and Manual Configuration of the DCBx Version......................................................................... 248
DCBx Example............................................................................................................................................................. 248
DCBx Prerequisites and Restrictions........................................................................................................................249
Configuring DCBx........................................................................................................................................................249
Verifying the DCB Configuration.....................................................................................................................................252
QoS dot1p Traffic Classification and Queue Assignment.............................................................................................260
Configuring the Dynamic Buffer Method.......................................................................................................................260
Sample DCB Configuration...............................................................................................................................................261
12 Dynamic Host Configuration Protocol (DHCP)........................................................................... 263
DHCP Packet Format and Options.................................................................................................................................263
Assign an IP Address using DHCP.................................................................................................................................. 264
Implementation Information.............................................................................................................................................265
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