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Dell EMC Configuration Guide for the S3100 Series 9.14.2.4

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Stack Management Roles

The stack elects the management units for the stack management.

  • Stack master — primary management unit, also called the master unit.
  • Standby — secondary management unit.
  • Stack units — the remaining units in the stack, also called stack members. The system supports up to twelve stack units.
The master holds the control plane and the other units maintain a local copy of the forwarding databases. From the stack master you can configure:
  • System-level features that apply to all stack members.
  • Interface-level features for each stack member.
The master synchronizes the following information with the standby unit:
  • Stack unit topology
  • Stack running configuration (which includes ACL, LACP, STP, SPAN, and so on.)
  • Logs.
The master switch maintains stack operation with minimal impact in the event of:
  • Switch failure
  • Inter-switch stacking link failure
  • Switch insertion
  • Switch removal

If the master switch goes off line, the standby replaces it as the new master and the switch with the next highest priority or MAC address becomes standby.

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