HP Brocade 8/12c Brocade Network Advisor SAN User Manual v11.1x (53-1002167-01 - Page 396
QoS configuration, Enhanced Transmission Selection, Priority-based flow control
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14 QoS configuration QoS configuration QoS configuration involves configuring packet classification, mapping the priority and traffic class, controlling congestion, and scheduling. The configuration of these QoS entities consist of DCB Map and Traffic Class Map configuration. In a Data Center Bridging (DCB) configuration, Enhanced Transmission Selection (ETS) and Priority-based flow control (PFC) are configured by utilizing a priority table, a priority group table, and a priority traffic table. The Traffic Class Map is the mapping of user priority to traffic class. Enhanced Transmission Selection Enhanced Transmission Selection (ETS) allows lower priority traffic classes to use available bandwidth not being used by higher priority traffic classes and maximizes the use of available bandwidth. Priority-based flow control Priority based flow control (PFC) is an enhancement to the existing pause mechanism in Ethernet. PFC creates eight separate virtual links on the physical link and allows any of these links to be paused and restarted independently, enabling the network to create a no-drop class of service for an individual virtual link. Table 28 shows examples of how priority grouping might be allocated in a 15-priority group scenario. TABLE 28 Ppriority grouping allocated in a 15-priority group example Priority group ID Bandwidth (%) Priority flow control 0 55 on 1 25 on 2 0 off 3 0 off 4 5 off 5 0 off 6 15 on 7 0 off 15.0-15.7 Strict priority on No bandwidth % configuration allowed 352 Brocade Network Advisor SAN User Manual 53-1002167-01
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1,207
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1,208
-
1,209
-
1,210
-
1,211
-
1,212
-
1,213
-
1,214
-
1,215
-
1,216
-
1,217
-
1,218
-
1,219
-
1,220
-
1,221
-
1,222
-
1,223
-
1,224
-
1,225
-
1,226
-
1,227
-
1,228
-
1,229
-
1,230
-
1,231
-
1,232
-
1,233
-
1,234
-
1,235
-
1,236
-
1,237
-
1,238
-
1,239
-
1,240
-
1,241
-
1,242
-
1,243
-
1,244
-
1,245
-
1,246
-
1,247
-
1,248
-
1,249
-
1,250
-
1,251
-
1,252
-
1,253
-
1,254
-
1,255
-
1,256
-
1,257
-
1,258
-
1,259
-
1,260
-
1,261
-
1,262
-
1,263
-
1,264
-
1,265
-
1,266
-
1,267
-
1,268
-
1,269
-
1,270
-
1,271
-
1,272
-
1,273
-
1,274
-
1,275
-
1,276
-
1,277
-
1,278
-
1,279
-
1,280
-
1,281
-
1,282
-
1,283
-
1,284
-
1,285
-
1,286
-
1,287
-
1,288
-
1,289
-
1,290
-
1,291
-
1,292
-
1,293
-
1,294
-
1,295
-
1,296
-
1,297
-
1,298
-
1,299
-
1,300
-
1,301