Dell PowerConnect 8100 User's Configuration Guide - Page 1146
CoS Queue Usage, Default CoS Values
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• Weighted Random Early Detection (WRED)-Drops packets queued for transmission selectively based their drop precedence level. For each of four drop precedence levels on each WRED-enabled interface queue, you can configure the following parameters: - Minimum Threshold: A percentage of the total queue size below which no packets of the selected drop precedence level are dropped. - Maximum Threshold: A percentage of the total queue size above which all packets of the selected drop precedence level are dropped. - Drop Probability: When the queue depth is between the minimum and maximum thresholds, this value provides a scaling factor for increasing the number of packets of the selected drop precedence level that are dropped as the queue depth increases. The drop probability supports configuration in the range of 0 to 10%, and the discrete values 25%, 50%, and 75%. Values not listed are truncated to the next lower value in hardware. CoS Queue Usage CoS queue 7 is reserved by the system and is not assignable. It is generally recommended that the administrator utilize CoS queues 0 to 3, as CoS queues 4-6 may be used by the system for other types of system traffic, for example, routing protocol PDU handling. Default CoS Values Table 41-1 shows the global default values for CoS. Table 41-1. CoS Global Defaults Parameter Trust Mode 802.1p CoS value to queue mapping Default Value 802.1p 802.1p CoS 0, 3 1, 2 4, 5 6, 7 Queue 1 0 2 3 1146 Configuring Class-of-Service
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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