Dell PowerConnect 8100 User's Configuration Guide - Page 822
To reduce flapping of configuration information, if the configuration source, port is disabled
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If there is no configuration source, a port may elect itself as the configuration source on a first-come, first-serve basis from the set of eligible ports. A port is eligible to become the configuration source if the following conditions are true: • No other port is the configuration source. • The port role is auto-upstream. • The port is enabled with link up and DCBx enabled. • The port has negotiated a DCBx relationship with the partner. • The switch is capable of supporting the received configuration values, either directly or by translating the values into an equivalent configuration. Whether or not the peer configuration is compatible with the configured values is NOT considered. The newly elected configuration source propagates DCBx client information to the other ports and is internally marked as being the port over which configuration has been received. Configuration changes received from the peer over the configuration source port are propagated to the other auto configuration ports. Ports receiving auto configuration information from the configuration source ignore their current settings and utilize the configuration source information. When a configuration source is selected, all auto-upstream ports other than the configuration source are marked as willing disabled. To reduce flapping of configuration information, if the configuration source port is disabled, disconnected, or loses LLDP connectivity, the system clears the selection of configuration source port (if not manually selected) and enables the willing bit on all auto-upstream ports. The configuration on the auto configuration ports is not cleared (configuration holdover). If the user wishes to clear the configuration on the system in this scenario, the user can put the configuration source port into manual mode. When a new port is selected as the configuration source, it is marked as the configuration source, the DCBx configuration is refreshed on all auto configuration ports, and each port may begin configuration negotiation with their peer again (if any information has changed). 822 Configuring Data Center Bridging Features
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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