Dell PowerConnect 8100 User's Configuration Guide - Page 818
DCB Capability Exchange
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DCB Capability Exchange The Data Center Bridging Exchange Protocol (DCBx) is used by DCB devices to exchange configuration information with directly connected peers. DCBx uses type-length-value (TLV) information elements over LLDP to exchange information, so LLDP must be enabled on the port to enable the information exchange. By default, LLDP is enabled on all ports. For more information, see "Discovering Network Devices" on page 651. The main objective of DCBx is to perform the following operations: • Discovery of DCB capability in a peer: DCBx is used to learn about the capabilities of the peer device. It is a means to determine if the peer device supports a particular feature such as PFC. • DCB feature misconfiguration detection: DCBx can be used to detect misconfiguration of a feature between the peers on a link. Misconfiguration detection is feature-specific because some features may allow asymmetric configuration. • Peer configuration of DCB features: DCBx can be used by a device to perform configuration of DCB features in its peer device if the peer device is willing to accept configuration. DCBx is expected to be deployed in Fibre Channel over Ethernet (FCoE) topologies in support of lossless operation for FCoE traffic. In these scenarios, all network elements are DCBx-enabled. In other words, DCBx is enabled end-to-end. For discussion and examples of configuring iSCSI with DCBX, refer to "Configuring iSCSI Optimization" on page 395. The DCBx protocol supports the propagation of configuration information for the following features: • Enhanced Transmission Selection (ETS) • Priority-based Flow Control (PFC) • Application Priorities These features use DCBx to send and receive device configuration and capability information to the peer DCBx device. The Application Priorities information is simply captured from the peer and potentially propagated to other peers by the DCBx component, as well as being configured when iSCSI is enabled on an operationally active PFC port. 818 Configuring Data Center Bridging Features
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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