Owners Manual

○ I/O module and iDRAC network settings.
○ First boot device on the compute sleds.
○ Checks I/O path consistency for the I/O module, PCIe slots, and sleds and disables components if necessary to protect
the system hardware.
○ User access security.
The CMC module is hot-swappable. During the period that the CMC module is removed:
● you cannot turn on newly installed compute sleds
● existing compute sleds cannot be accessed remotely
● enclosure cooling fans run at maximum speed for thermal protection of the components
Daisy-chain CMC network connection
The CMC has two RJ-45 Ethernet ports, labeled Gb1 (the uplink port) and STK/Gb2 (the stacking or cable consolidation port).
With basic cabling, you can connect the Gb port to the management network and leave the STK/Gb2 port unused.
CAUTION: Connecting the STK/Gb2 port to the management network will have unpredictable results if the CMC
setting is not changed from default Stacking to Redundant, to implement NIC failover. In the default Stacking
mode, cabling the Gb1 and STK/Gb2 ports to the same network (broadcast domain) can cause a broadcast
storm. A broadcast storm can also occur if the CMC setting is changed to Redundant mode, but the cabling is
daisy chained between chassis in the Stacking mode. Ensure that the cabling model matches the CMC setting
for the intended usage.
NOTE: The STK/Gb2 port can also be used for CMC NIC failover. Ensure that the CMC setting is changed from default
Stacking to Redundant to implement NIC failover.
If you have multiple chassis in a rack, you can reduce the number of connections to the management network by daisy-chaining
up to four chassis together. This reduces the connections required from four to one.
When daisy-chaining chassis together, Gb1 is the uplink port and STK/Gb2 is the stacking (cable consolidation) port. Connect
the Gb ports to the management network or to the STK port of the CMC in a chassis that is closer to the network. You must
connect the STK port only to a Gb port that is further from the chain or network.
NOTE:
The CMC must be installed for the system to power on. See the PowerEdge FX2/FX2s CMC User’s Guide at
Dell.com/poweredgemanuals for complete instructions on setting up and operating the CMC module.
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