Dell PowerEdge M805 - Manual (Page 19)

Configuration Guide
17
CMC Daisy Chaining (Enclosure Stacking)
CMC daisy chaining can be utilized to minimize the number of network
connections required for chassis (enclosure) management, such that only one
or two network connections (depending on whether or not redundant CMCs
are installled) are needed for up to four M1000e enclosures.
Cabling Guidelines
Follow these guidelines to daisy chain CMC modules from enclosure to
enclosure:
• CMC Ethernet port "GB1" is the "Uplink" port. It will uplink to either the
management network, or to receive a cable from the CMC Ethernet port
labeled "STK" in the adjacent enclosure.
The CMC Ethernet port labeled "STK" is the "daisy-chain" port. It will
only connect to CMC port GB1 on the adjacent enclosure. Do not connect
this cable directly to the management network.
• Up to 4 enclosures can be daisy-chained.
• Enclosures can be daisy-chained in both redundant and non-redundant
deployments:
– In a redundant CMC deployment, cable all CMC modules in the CMC
primary slots together. Cable all CMC modules in the CMC secondary
slots together. Do not connect the primary daisy chain with the
secondary daisy chain (do not “cross cable” the two sets of CMCs).
– In a non-redundant CMC, cable all CMC modules in the CMC
primary slots together.
Figure 1-10 shows four enclosures with redundant CMC modules installed.
Primary CMC port GB1 in the first enclosure connects to the management
network. Primary CMC port GB1 in the adjacent enclosure is "uplinked” into
the port labeled "STK" on the primary CMC in the enclosure above it. No
cable is required in port STK on the fourth enclosure in line. The same
cabling scheme is valid for the daisy chain of CMC modules in the secondary
slot of the enclosures.
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