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Dell PowerEdge M1000e Chassis Management Controller Firmware Version 5.1 User’s Guide

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Daisy chain 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 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 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 CMCs in the active CMC slot and the second CMC slot.

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

Daisy-chained CMC Network Connection
1Management Network
2 Standby CMC
3Active CMC
The following figures provide examples of incorrect cabling of CMC.
Incorrect Cabling for CMC Network Connection - 2 CMCs
Incorrect Cabling for CMC Network Connection - Single CMC
Incorrect Cabling for CMC Network Connection - 2 CMCs
To daisy-chain up to four chassis:
  1. Connect the GB port of the active CMC in the first chassis to the management network.
  2. Connect the GB port of the active CMC in the second chassis to the STK port of the active CMC in the first chassis.
  3. If you have a third chassis, connect the GB port of its active CMC to the STK port of the active CMC in the second chassis.
  4. If you have a fourth chassis, connect the GB port of its active CMC to the STK port of the third chassis.
  5. If you have redundant CMCs in the chassis, connect them using the same pattern.
    • 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 a loss of data. Cabling GB and STK to the same network (broadcast domain) can cause a broadcast storm.
    • NOTE: Do not connect an active CMC to a standby CMC.
    • 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 has been lost and they may fail over to their redundant CMCs.
  6. To get started with CMC, see Installing Remote Access Software on a Management Station .

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