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Dell EMC SmartFabric OS10 User Guide Release 10.5.1

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DCBX configuration notes

  • DCBX is a prerequisite for using DCB features, such as PFC and ETS, to exchange link-level configurations in a converged network.
  • DCBX, when deployed in topologies, enables lossless operation for FCoE or iSCSI traffic. In these scenarios, all network devices in the topology must have DCBX-enabled.
  • DCBX uses LLDP to advertise and automatically negotiate the administrative state and PFC or ETS configuration with directly connected DCB peers. DCBX cannot run if LLDP is disabled on an interface. Enable LLDP on all the DCBX port. For more information about LLDP, see Link Layer Discovery Protocol.

  • By default, DCBX is disabled globally. Enable DCBX globally on a switch to activate the exchange of DCBX TLV messages with PFC, ETS, and iSCSI configurations.

  • By default, DCBX is enabled on the physical interfaces except on the management interface.
  • You can manually reconfigure DCBX settings on an individual interface. For example, you can disable DCBX on an interface using the no lldp tlv-select dcbxp command or change the DCBX version using the dcbx version command.
  • For DCBX to be operational, DCBX must be enabled both globally and on the interface. If the show lldp dcbx interface command returns the message DCBX feature not enabled, DCBX is not enabled at both levels.
  • OS10 supports DCBX versions CEE and IEEE2.5.
  • If ETS and PFC are enabled, DCBX advertises ETS configuration, ETS recommendation, and PFC configuration. When you configure application-specific parameters such as FCoE or iSCSI to be advertised, DCBX advertises the respective Application Priority TLVs.
  • A DCBX-enabled port operates only in a manual role. In this mode, the port operates only with user-configured settings and does not autoconfigure with DCB settings that are received from a DCBX peer. When you enable DCBX, the port advertises its PFC and ETS configurations to peer devices but does not accept external, or propagate internal, DCB configurations.
    NOTE: OS10 does not support autoupstream and autodownstream DCBX port roles. Hence, DCBX-enabled port autoconfiguration is not supported.
  • DCBX detects a misconfiguration on a peer device when DCB features are not compatibly configured with the local switch.
    NOTE: Misconfiguration detection is feature-specific because some DCB features support asymmetric (nonidentical) configurations.

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