Important Points to Remember
• The unit number with the split ports must be the default (stack-unit 0). To verify the unit number, use
the show system brief command. If the unit ID is different than 0, renumber it to 0 before you
split the ports by using the stack-unit id renumber 0 command in EXEC mode.
• The quad port must be in a default configuration before you can split it into four 10G SFP+ ports. The
40G port is lost in the configuration when you split the port, so be sure to remove the port from other
L2/L3 feature configurations.
• For the split-port change to take effect, reload the system after issuing the command. Save your
configuration.
Splitting QSFP+ Ports to SFP+ or RJ-45 Ports
The S4820T supports splitting a single 40G QSFP port into four 10G SFP+ ports or four 10G RJ-45 using
one of the supported breakout cables.
For the system to recognize the port type change, enter the stack-unit portmode command. For
example:
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 7.
• number: enter the port number of the 40G port to be split. The range is from 0 to 124 in increments
of 4.
Install the Hardware
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