Dell PowerConnect 8100 User's Configuration Guide - Page 816
PFC Configuration Example, Optimization Configuration Examples
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PFC Configuration Example The network in this example handles both data and voice traffic. Because the voice traffic is time sensitive, it requires a higher priority than standard data traffic. The voice traffic uses VLAN 100 and has an 802.1p priority of 5, which is mapped to hardware queue 4. IP phones are connected to ports 3, 5, and 10, so PFC is enabled on these ports with 802.1p priority 5 traffic as no-drop. The configuration also enables VLAN tagging so that the 802.1p priority is identified. This example assumes the voice VLAN (VLAN 100) has already been configured. The administrator may need to perform other configuration steps to ensure suitable network operation, including configuring the bandwidth allocation for the drop and no-drop priorities or to enable or disable the DCBX protocol. CAUTION: All ports may be briefly shutdown when modifying either flow control (FC) or PFC settings. PFC uses a control packet defined in 802.1Qbb and is not compatible with IEEE 802.3 Annex 31B flow control. 1 Map 802.1p priority 5 to traffic class 4. The following command changes the priority to traffic class mapping to be one-to-one, based upon the default switch settings. For lossless service, a priority must be mapped oneto-one to a traffic class. For more information about traffic classes, see "Configuring Class-of-Service" on page 1143. For a complete example of manually configuring a PC81xx switch for iSCSI with PFC, refer to "iSCSI Optimization Configuration Examples" on page 409. console#configure console(config)#classofservice dot1p-mapping 5 4 2 Enter Interface Configuration mode for ports 3, 5, and 10, and then enter Data Center Bridging mode for these ports. console(config)#interface range te1/0/3, te1/0/5, te1/0/10 console(config-if)#datacenter-bridging 3 Enable PFC and configure traffic marked with 802.1p priority 5 to be paused rather than dropped when congestion occurs. console(config-dcb)#priority-flow-control mode on console(config-dcb)#priority-flow-control priority 5 no-drop 816 Configuring Data Center Bridging Features
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1,189
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1,190
-
1,191
-
1,192
-
1,193
-
1,194
-
1,195
-
1,196
-
1,197
-
1,198
-
1,199
-
1,200
-
1,201
-
1,202
-
1,203
-
1,204
-
1,205
-
1,206
-
1,207
-
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