Unit Failure In Stack - Cisco 500 series Administration Manual

Stack Management

Unit Failure in Stack

Unit Failure in Stack
Cisco 500 Series Stackable Managed Switch Administration Guide
Auto Number 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
Failure of Master Unit
If the Master fails, the backup unit takes over the master role and continues to
operate the stack normally.
In order for the backup to be able to take the place of the master, both units
maintain a warm standby at all times. In warm standby, the master and its backup
units are synchronized with the static configuration (contained in both the Startup
and Running configuration files). Backup configuration files are not synchronized.
The backup configuration file remains on the previous master.
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