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

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Splitting QSFP Ports to SFP+ Ports

The MXL 10/40GbE switch supports splitting a 40GbE port on the base module or a 2-Port 40GbE QSFP+ module into four 10GbE SFP+ ports using a 4x10G breakout cable.

  • NOTE: By default, the 40GbE ports on a 2-Port 40GbE QSFP+ module come up in 4x10GbE (quad) mode as eight 10GbE ports. On the base module, you must convert the 40GbE ports to 4x10GbE mode as described in the following section.
  • NOTE: When you split a 40G port (such as fo 0/4) into four 10G ports, the 40G interface configuration is 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.
  • Split a single 40G port into 4-10G ports. CONFIGURATION mode stack-unit port number portmode quad
    • stack-unit: Enter the stack member unit identifier of the stack member to reset. The range is from 0 to 5.
    • port <port number> : Enter the port number of the 40G port to be split. The valid values on base module: 33 or 37; OPTM SLOT 0: 41 or 45; OPTM SLOT 1: 49 or 53.
    • portmode quad: Identifies the uplink port as a split 10GbE SFP+ port.
    To display the stack-unit number, enter the show system brief command.
  • Save the configuration and reload the switch. CONFIGURATION mode write memory reload

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