Cisco SF500-24 Administration Manual page 85

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• One or more duplicate unit IDs exist. Auto numbering resolves conflicts and
assigns unit IDs. In case of manual numbering, only one unit retains its unit ID
and the other(s) are shutdown.
• The number of units in the stack exceeds the maximum number of units
allowed. The new units that joined the stack are shut down, and a SYSLOG
message is generated and appears on the master unit.
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 an example of auto numbering when a new unit joins the
stack. The existing units retain their ID. The new unit receives the lowest available
ID.
Auto Number Unit
Cisco 500 Series Stackable Managed Switch Administration Guide Release 1.3
Administration: Stack Management
Stack Changes