Installation Guide
QX-S5500G Series Ethernet Switches
5-6
5.2.5 Planning the cabling scheme
Use SFP+/QSFP+ DAC cables or SFP+/QSFP+ transceiver modules and fibers to connect
the IRF member switches.
If the IRF member switches are far away from one another, choose the SFP+/QSFP+
transceiver modules with optical fibers. If the IRF member switches are all in one
equipment room, choose SFP+/QSFP+ DAC cables. For more information about
SFP+/QSFP+ DAC cables and SFP+/QSFP+ transceiver modules, see "
Appendix C Ports
and LEDs.
"
The following subsections describe several NEC recommended IRF connection schemes,
and all these schemes use a ring topology.
IMPORTANT:
In these schemes, all physical IRF ports are located on the same side. If physical IRF ports are on different
sides, you must measure the distance between them to select an appropriate cable.
I.
Connecting the IRF member switches in one rack
Use SFP+ DAC cables to connect the IRF member switches (9 switches in this example) in
a rack as shown in Figure 5-4. The switches in the ring topology (see Figure 5-5) are in the
same order as connected in the rack.
