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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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Enabling Data Center Bridging

DCB is automatically configured when you configure FCoE or iSCSI optimization.

Data center bridging supports converged enhanced Ethernet (CEE) in a data center network. DCB is disabled by default. It must be enabled to support CEE.
  • Priority-based flow control
  • Enhanced transmission selection
  • Data center bridging exchange protocol
  • FCoE initialization protocol (FIP) snooping

DCB processes virtual local area network (VLAN)-tagged packets and dot1p priority values. Untagged packets are treated with a dot1p priority of 0.

For DCB to operate effectively, you can classify ingress traffic according to its dot1p priority so that it maps to different data queues. The dot1p-queue assignments used are shown in the following table.

To enable DCB, enable either the iSCSI optimization configuration or the FCoE configuration.

To enable DCB with PFC buffers on a switch, enter the following commands, save the configuration, and reboot the system to allow the changes to take effect.

  1. Enable DCB.
    CONFIGURATION mode
    dcb enable
  2. Set PFC buffering on the DCB stack unit.
    CONFIGURATION mode
    DellEMC(conf)#dcb enable pfc-queues 
NOTE Dell EMC Networking OS Behavior: DCB is not supported if you enable link-level flow control on one or more interfaces. For more information, refer to Ethernet Pause Frames.

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