Administration: Stack Management
Unit Failure in Stack
Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x 124
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The following shows an example of auto numbering when a master-enabled unit joins the
stack. There are two units with unit ID = 1. The master selection process selects the best unit to
be the master unit. The best unit is the unit with the higher uptime in segments of 10 minutes.
The other unit is made the backup.
Auto-numbered Master-enabled Unit
The following shows what happens when a user-assigned, master-enabled unit with Unit ID 1
joins a stack that already has a master unit with user-assigned unit ID 1. The newer Unit 1 does
not join the stack and is shutdown.
User-assigned Master-enabled Unit
Unit Failure in Stack
This section includes the following topics:
• Failure of Master Unit
• Master/Backup Switchover
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