HowTo use Mellanox QSA

Version 3

    This post discusses the usage of Mellanox QSA. This post is basic and meant for beginners.

     

    References

     

    Mellanox QSA is a  QSFP (40GbE) to SFP+ (10GbE) adapter. It uses only one lane out of the four lanes available in the QSFP interface.

    The QSA can be plugged into and of Mellanox ConnectX Adapter family.

    The usage is simple: you plug the QSA into the switch or adapter, and the you plug the 10GbE cable into the QSA.

     

    Notes

    1. When plugging the QSA into an adapter, no additional configuration is needed. The adapter will work in 10GbE.

     

    2. When plugging the QSA into an Mellanox Ethernet switch, you still need to enter the switch CLI/GUI and manually change the speed to 10GbE.

     

    For example, assuming the QSA was plugged into Ethernet switch port 1/1, run:

    switch (config) # interface ethernet 1/1 speed 10000    --> Speed is in Mb/s

    switch (config) # configuration write

     

    3. It is less common but possible to plug another SFP+ to SFP (10GbE to 1GbE) into the QSA and to reduce the port speed even to 1GbE.

    Again, if it is a Mellanox Ethernet switch port, you must configure that manually.

     

    For example, assuming the QSA was plugged into Ethernet switch port 1/1 and another SFP+ to SFP adapter was plugged into the QSA to reach 1GbE, run:

    switch (config) # interface ethernet 1/1 speed 1000

    switch (config) # configuration write

     

    QSA_small.png