• The range of port numbers on a 40G port to be split is 0 to 20.To verify port splitting, use the show system linecard {0–11} fanout {count | configure}command.• The quad port must be in a default configuration before you can split it into 4x10G ports. The 40G portis lost in the configuration when the port is split; be sure that the port is also removed from other L2/L3feature configurations.Converting a QSFP or QSFP+ Port to an SFP orSFP+ PortYou can convert a QSFP or QSFP+ port to an SFP or SFP+ port using the Quad to Small Form FactorPluggable Adapter (QSA).QSA provides smooth connectivity between devices that use Quad Lane Ports (such as the 40 GigabitEthernet adapters) and 10 Gigabit hardware that uses SFP+ based cabling. Using this adapter, you caneffectively 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 orSFP+ cables. This interface enables you to directly plug in an SFP or SFP+ cable originating at a 10 GigabitEthernet port on a switch or server.You can use QSFP optical cables (without a QSA) to split a 40 Gigabit port on a switch or a server into four 10Gigabit ports. You must enable the fan-out mode in order for this mechanism to work.Similarly, you can enable the fan-out mode to configure the QSFP port on a device to act as an SFP or SFP+port. As the QSA enables a QSFP or QSFP+ port to be used as an SFP or SFP+ port, Dell Networking OS doesnot immediately detect the QSA after you insert it into a QSFP port cage.After you insert an SFP or SFP+ cable into a QSA connected to a 40 Gigabit port, Dell Networking OS assumesthat all the four fanned-out 10 Gigabit ports have plugged-in SFP or SFP+ optical cables. However, the link UPevent happens only for the first 10 Gigabit port and you can use only that port for data transfer. As a result,only the first fanned-out port is identified as the active 10 Gigabit port with a speed of 10G or 1G dependingon whether you insert an SFP+ or SFP cable respectively.NOTE: Although it is possible to configure the remaining three 10 Gigabit ports, the Link UP event doesnot occur for these ports leaving the lanes unusable. Dell Networking OS perceives these ports to be in aLink Down state. You must not try to use these remaining three 10 Gigabit ports for actual data transfer orfor any other related configurations.NOTE: Trident2 chip sets do not work at 1G speeds with auto-negotiation enabled. As a result, when youpeer any device using SFP, the link does not come up if auto-negotiation is enabled. Therefore, you mustdisable auto-negotiation on platforms that currently use Trident2 chip sets (9000 series). This limitationapplies only when you convert QSFP to SFP using the QSA. This constraint does not apply for QSFP to SFP+ conversions using the QSA.Interfaces 533
