Deployment Guide

Table Of Contents
Priority-Based Flow Control................................................................................................................................... 238
Enhanced Transmission Selection.........................................................................................................................239
Data Center Bridging Exchange Protocol (DCBx)............................................................................................240
Data Center Bridging in a Traffic Flow................................................................................................................. 241
Enabling Data Center Bridging..................................................................................................................................... 241
DCB Maps and its Attributes..................................................................................................................................242
Data Center Bridging: Default Configuration........................................................................................................... 242
Configuring Priority-Based Flow Control.................................................................................................................. 243
Configuring Lossless Queues................................................................................................................................. 243
Configuring PFC in a DCB Map................................................................................................................................... 245
Applying a DCB Map on a Port....................................................................................................................................246
Configuring PFC without a DCB Map........................................................................................................................ 247
Configuring PFC Asymmetric.......................................................................................................................................248
Priority-Based Flow Control Using Dynamic Buffer Method............................................................................... 249
Behavior of Tagged Packets........................................................................................................................................250
Configuration Example for DSCP and PFC Priorities.............................................................................................250
SNMP Support for PFC and Buffer Statistics Tracking........................................................................................ 251
Performing PFC Using DSCP Bits Instead of 802.1p Bits..................................................................................... 251
PFC and ETS Configuration Examples.......................................................................................................................253
Using PFC to Manage Converged Ethernet Traffic...............................................................................................253
Operations on Untagged Packets...............................................................................................................................253
Generation of PFC for a Priority for Untagged Packets.......................................................................................253
Configure Enhanced Transmission Selection........................................................................................................... 253
ETS Prerequisites and Restrictions...................................................................................................................... 254
Creating an ETS Priority Group.............................................................................................................................254
ETS Operation with DCBx...................................................................................................................................... 255
Configuring Bandwidth Allocation for DCBx CIN.............................................................................................. 255
Configuring ETS in a DCB Map............................................................................................................................. 256
Hierarchical Scheduling in ETS Output Policies.......................................................................................................257
Using ETS to Manage Converged Ethernet Traffic................................................................................................257
Applying DCB Policies in a Switch Stack.................................................................................................................. 258
Configure a DCBx Operation........................................................................................................................................258
DCBx Operation.........................................................................................................................................................258
DCBx Port Roles........................................................................................................................................................258
DCB Configuration Exchange................................................................................................................................ 260
Configuration Source Election............................................................................................................................... 260
Propagation of DCB Information...........................................................................................................................260
Auto-Detection and Manual Configuration of the DCBx Version.................................................................. 261
DCBx Example............................................................................................................................................................ 261
DCBx Prerequisites and Restrictions................................................................................................................... 262
Configuring DCBx......................................................................................................................................................262
Verifying the DCB Configuration................................................................................................................................ 265
QoS dot1p Traffic Classification and Queue Assignment...................................................................................... 273
Configuring the Dynamic Buffer Method.................................................................................................................. 273
Sample DCB Configuration........................................................................................................................................... 274
Chapter 12: Dynamic Host Configuration Protocol (DHCP)........................................................ 277
DHCP Packet Format and Options............................................................................................................................. 277
Assign an IP Address using DHCP.............................................................................................................................. 279
Implementation Information..........................................................................................................................................279
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Contents