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Condition Description
CMC failover
command issued
Chassis management resumes after the chassis fails over to the standby CMC.
CMC firmware
update
Chassis management resumes after the CMC reboots or chassis fails over to the
standby CMC. It is recommended that you update the standby CMC first so that
there is only one failover event. For more information on updating the CMC
firmware, see the CMC User's Guide at support.dell.com/manuals.
CMC error
detection and
correction
Chassis management resumes after the CMC resets or chassis fails over to the
standby CMC.
NOTE: You can configure the enclosure with a single CMC or with redundant CMCs. In redundant
CMC configurations, if the primary CMC loses communication with the enclosure or the
management network, the standby CMC takes over chassis management.
Daisy-Chain CMC Network Connection
Each CMC has two RJ-45 Ethernet ports, labeled GB (the uplink port) and STK (the stacking or cable
consolidation port). With basic cabling, you can connect the GB port to the management network and
leave the STK port unused.
CAUTION: Connecting the STK port to the management network can have unpredictable results.
Cabling GB and STK to the same network (broadcast domain) can cause a broadcast storm.
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. If each of the four chassis contains a redundant
CMC, by daisy-chaining you can reduce the number of management network connections required from
eight to two. If each chassis has only one CMC, you can reduce the connections required from four to
one.
When daisy-chaining chassis together, GB is the uplink port and STK 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 further from the chain or
network.
Create separate chains for the CMCs in the active CMC slot and the second CMC slot.
NOTE: At least one CMC must be installed for the system to power up. If a second, optional CMC
module is installed, failover protection and hot-swap replacement is available. See the latest CMC
User's Guide at support.dell.com/manuals for complete instructions on how to set up and operate
the CMC module.
The following figure illustrates the arrangement of cables for four daisy-chained chassis, each with active
and standby CMCs.
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