NEC ExpEther-2S, User Manual

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3.7 Connecting ExpEther products
Observe the following precautions when you connect ExpEther products.
 Use an ethernet network switch compliant with layer 2.

If Spanning Tree Protocol (STP) is enabled by the ethernet network switch setting, the
ExpEther board (40G) and the ExpEther IO Expansion Unit (40G) may take time to link
up and be ready for communication after the power-on and may not recognize the option
board mounted on the IO Expansion unit (40G)-2S. Disable the Spanning Tree Protocol
(STP) function before using.
(Check the instruction manual of the ethernet network switch for the setting.)
 ExpEther products have multiple network connection ports. We recommend that you use
all network connection ports in multipath configuration. You can attain the following
performances in a multipath configuration.
・
Improvement of the transfer performance by distributing the network load
・
Redundancy mechanism to continue operation using other ports in case of a problem
on one port
 We recommend that you use a network switch whose delay time (latency) is short.
 If you use a switch whose delay time (latency) is long, you may deteriorate the
performance and may not have it normally operated depending on the I/O device
connected.
 We recommend the following to avoid improper connection to network switches
constituting two network systems if you operate ExpEther products in the configuration of
two independent networks.
・ Change the color of cables used for each network system.
・
Attach tags near the connector of the cable to identify the connection source.
Important When you connect ExpEther products, check if the server to mount the
ExpEther board (40G), OS, devices to mount the ExpEther IO Expansion Unit
(40G), and the driver are compatible with the hot plug feature of the PCI
Express slot.
If they are not compatible with the hot plug of the PCI Express slot, they could
cause unexpected malfunctions by pulling and inserting the QSPF+ port during
operation.