Reference Guide

204 | Stacking
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Figure 17-15. A Two-Aggregator Stack
Stack Management Roles
The stack elects the management units for the stack management:
• Stack master: primary management unit
• Standby: secondary management unit
The master holds the control plane and the other units maintain a local copy of the forwarding databases.
From 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 LACP, SNMP, etc.)
• 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.
Note: For the Aggregator, the entire stack has only one management IP address.