Dell PowerSwitch S4820T 9.50.1 Configuration Guide for the S4820T System - Page 432

tdr-cable-test gigabitethernet / Between two ports, do not start the test on both ends of the cable. Enable the interface before starting the test. Enable the port to run the test or the test prints an error message. 2. Displays TDR test results. EXEC Privilege mode show tdr gigabitethernet / Splitting QSFP Ports to SFP+ Ports Splitting QSFP ports to SFP+ ports is supported on the S4820T platform. The S4820T 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 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. To split a single 40G port into four 10G ports, use the following command. • Split a single 40G port into 4-10G ports. CONFIGURATION mode stack-unit 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 11. - number: enter the port number of the 40G port to be split. The range is from 0 to 47 for 10G ports and 48, 52, 56 and 60 for 40G ports. 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 S4820T system. • The unit number with the split ports must be the default (stack-unit 0). To verify port splitting, use the show system brief command. If the unit ID is different than 0, it must be renumbered to 0 before ports are split by using the stackunit id renumber 0 command in EXEC mode. • 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. 432 Interfaces