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Dell Chassis Management Controller Version 2.10 for PowerEdge FX2 and FX2s User's Guide

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Daisy chain FX2 CMC network connection

If you have multiple chassis in a rack, you can reduce the number of connections to the management network by daisy-chaining up to ten chassis together. You can reduce the number of management network uplink connections required from ten 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 CMC in a chassis that is closer to the network. Connect the STK port only to a Gb port further from the chain or network.

The following figure illustrates the arrangement of cables for four daisy-chained chassis, each with active CMCs.

Daisy-chained storage sleds in FX2 CMC network
Table 1. Daisy-chained storage sleds. The following table lists the daisy-chain storage sled CMC network components.
1Management Network
2Active CMC

The following figure illustrates an example of incorrect cabling of CMC in stacking mode.

Incorrect cabling of CMC in stacking mode
Following are the steps to daisy-chain four FX2 CMC modules:

  1. Connect the GB port of the FX2 CMC in the first chassis to the management network.

  2. Connect the GB port of the FX2 CMC in the second chassis to the STK port of the FX2 CMC in the first chassis.

  3. If you have a third chassis, connect the GB port of its FX2 CMC to the STK port of the FX2 CMC in the second chassis.

  4. If you have a fourth chassis, connect the GB port of its FX2 CMC to the STK port of the FX2 CMC in the third chassis.

  • CAUTION: The STK port on any CMC must never be connected to the management network. It can only be connected to the GB port on another chassis. Connecting a STK port to the management network can disrupt the network and cause loss of data. Cabling GB and STK to the same network (broadcast domain) can cause a broadcast storm.
  • NOTE: Resetting a CMC whose STK port is chained to another CMC can disrupt the network for CMCs that appear later in the chain. The child CMCs may log messages indicating that the network link is lost.

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