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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Enabling Data Center Bridging

Data center bridging is enabled by default on an FN IOM to support converged enhanced Ethernet (CEE) in a data center network.

A prerequisite for configuring DCB:
  • 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.

On the FN IOM Switch, by default, DCB is enabled and MMU buffers are reserved to achieve no-drop traffic handling for PFC. Disabling DCB does not release the buffers reserved by default. To utilize reserved buffers for non-DCB applications, you have to explicitly release the buffers (Refer to Configuring the PFC Buffer in a Switch Stack ).

To disable or re-enable DCB on a switch, enter the following commands.

  1. Disable DCB. CONFIGURATION mode no dcb enable
  2. Re-enable DCB. CONFIGURATION mode dcb enable
  • NOTE: Dell Networking OS Behavior : DCB is not supported if you enable link-level flow control on one or more interfaces.

After you disable DCB, if link-level flow control is not automatically enabled on an interface, to enable flow control, manually shut down the interface (the shutdown command) and re-enable it (the no shutdown command).


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