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Catalyst 3750 Switch Software Configuration Guide
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Chapter 5 Managing Switch Stacks
Understanding Switch Stacks
Figure 5-1 Creating a Switch Stack from Two Standalone Switches
Figure 5-2 Adding a Standalone Switch to a Switch Stack
Stack Master Election and Re-Election
The stack master is elected or re-elected based on one of these factors and in the order listed:
1. The switch that is currently the stack master.
2. The switch with the highest stack member priority value.
Note We recommend assigning the highest priority value to the switch that you prefer to be the
stack master. This ensures that the switch is re-elected as stack master if a re-election occurs.
3. The switch not using the default interface-level configuration.
4. The switch with the higher priority switch software version. These switch software versions are
ordered from highest to lowest priority:
1. Cryptographic EMI software
2. Noncryptographic EMI software
3. Cryptographic SMI software
4. Noncryptographic SMI software
The Catalyst 3750 EMI cryptographic image has a higher priority than the Catalyst 3750 SMI image
during the master switch election in a stack. However, when two or more switches in the stack use
different software images, such as the SMI image for Cisco IOS Release 12.1(11)AX and the
86880
Stack member 1 Stack member 1
Stack member 1
Stack member 2
and stack master
86881
Stack member 1
Stack member 2
and stack master
Stack member 3
Stack member 4
Stack member 1
Stack member 2
and stack master
Stack member 3
Stack member 1
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