Users Guide

PFC Prerequisites and Restrictions.......................................................................................................................238
Applying a DCB Map on a Port.................................................................................................................................... 238
Configuring PFC without a DCB Map.........................................................................................................................239
Configuring Lossless QueuesExample:................................................................................................................. 239
Priority-Based Flow Control Using Dynamic Buffer Method....................................................................................241
Pause and Resume of Traffic................................................................................................................................. 241
Buffer Sizes for Lossless or PFC Packets............................................................................................................ 241
Behavior of Tagged Packets........................................................................................................................................242
Configuration Example for DSCP and PFC Priorities................................................................................................242
SNMP Support for PFC and Buffer Statistics Tracking...........................................................................................243
Performing PFC Using DSCP Bits Instead of 802.1p Bits........................................................................................243
PFC and ETS Configuration Examples....................................................................................................................... 244
Using PFC to Manage Converged Ethernet Traffic................................................................................................. 244
Operations on Untagged Packets............................................................................................................................... 244
Generation of PFC for a Priority for Untagged Packets.......................................................................................... 245
Configure Enhanced Transmission Selection.............................................................................................................245
ETS Prerequisites and Restrictions.......................................................................................................................245
Creating an ETS Priority Group............................................................................................................................. 245
ETS Operation with DCBx......................................................................................................................................246
Configuring Bandwidth Allocation for DCBx CIN.................................................................................................247
Configuring ETS in a DCB Map..............................................................................................................................248
Hierarchical Scheduling in ETS Output Policies.........................................................................................................249
Using ETS to Manage Converged Ethernet Traffic..................................................................................................249
Applying DCB Policies in a Switch Stack....................................................................................................................250
Configure a DCBx Operation....................................................................................................................................... 250
DCBx Operation.......................................................................................................................................................250
DCBx Port Roles......................................................................................................................................................250
DCB Configuration Exchange................................................................................................................................ 252
Configuration Source Election............................................................................................................................... 252
Propagation of DCB Information........................................................................................................................... 253
Auto-Detection and Manual Configuration of the DCBx Version..................................................................... 253
DCBx Example......................................................................................................................................................... 253
DCBx Prerequisites and Restrictions.................................................................................................................... 254
Configuring DCBx....................................................................................................................................................254
Verifying the DCB Configuration.................................................................................................................................258
QoS dot1p Traffic Classification and Queue Assignment.........................................................................................266
Configuring the Dynamic Buffer Method................................................................................................................... 267
Sample DCB Configuration...........................................................................................................................................268
PFC and ETS Configuration Command Examples.............................................................................................. 269
12 Dynamic Host Configuration Protocol (DHCP).........................................................................................270
DHCP Packet Format and Options............................................................................................................................. 270
Assign an IP Address using DHCP...............................................................................................................................272
Implementation Information..........................................................................................................................................273
Configure the System to be a DHCP Server............................................................................................................. 273
Configuring the Server for Automatic Address Allocation................................................................................. 274
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