Users Guide

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.
NOTE: You can split the 40G ports to 10G ports and vice —versa without reloading the device.
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.
Converting a QSFP or QSFP+ Port to an
SFP or SFP+ Port
You can convert a QSFP or QSFP+ port to an SFP or SFP+ port using the Quad to Small Form Factor
Pluggable Adapter (QSA).
QSA provides smooth connectivity between devices that use Quad Lane Ports (such as the 40 Gigabit
Ethernet adapters) and 10 Gigabit hardware that uses SFP+ based cabling. Using this adapter, you can
effectively use a QSFP or QSFP+ module to connect to a lower-end switch or server that uses an SFP or SFP+
based module.
When connected to a QSFP or QSFP+ port on a 40 Gigabit adapter, QSA acts as an interface for the SFP or
SFP+ cables. This interface enables you to directly plug in an SFP or SFP+ cable originating at a 10 Gigabit
Ethernet port on a switch or server.
Interfaces 436