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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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Splitting QSFP Ports to SFP+ Ports

The platform supports splitting a single 40G QSFP port into four 10G SFP+ ports using one of the supported breakout cables (for a list of supported cables, refer to the Installation Guide or the Release Notes).
NOTE When you split a 40G port (such as fo 1/4) into four 10G ports, the 40G interface configuration is still available in the startup configuration when you save the running configuration by using the write memory command. When a reload of the system occurs, the 40G interface configuration is not applicable because the 40G ports are split into four 10G ports after the reload operation. While the reload is in progress, you might see error messages when the configuration file is being loaded. You can ignore these error messages. Similarly, such error messages are displayed during a reload after you configure the four individual 10G ports to be stacked as a single 40G port.

To split a single 40G port into four 10G ports, use the following command.

Split a single 40G port into four 10G ports.
CONFIGURATION mode
stack-unit stack-unit-number port number portmode quad
  • number: enter the port number of the 40G port to be split.
NOTE To revert the port mode to 40G, use the no stack-unit stack-unit-number port port-number portmode quad command.

Important Points to Remember

  • Splitting a 40G port into four 10G ports is supported on standalone and stacked units.
  • You cannot use split ports as stack-link to stack a system.
To verify port splitting, use the show system stack-unit stack-unit-number fanout {count | configure} command.

To verify port splitting, use the show system stack-unit stack—unit—number fanout {count | configure} command

  • The quad port must be in a default configuration before you can split it into 4x10G ports. The 40G port is lost in the configuration when the port is split; be sure that the port is also removed from other L2/L3 feature configurations.
  • The system must be reloaded after issuing the CLI for the change to take effect.

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