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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
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Chapter 5      Clustering Switches
Creating a Switch Cluster
Designating and Enabling Standby Command Switches
To create a standby group, display Cluster Manager, and select Cluster > 
Standby Command Configuration to display the Standby Command 
Configuration window (Figure 5-5).
Eligible switches are listed in the Candidates list according to an eligibility 
ranking. Candidate switches are ranked first by the number of links they have and 
second by the switch speed. If the switches have the same number of links and 
speed, they are listed alphabetically.
In the Selected list, the active command switch has the highest priority and is 
always at the top of the list. The standby switch with the next highest priority 
becomes the standby command switch. The standby command switch is listed 
after the active command switch, followed by the other standby switches 
according to their priority. The last switch has the lowest priority. If the primary 
command switch fails, the standby command switch becomes the primary 
command switch. The standby switch with the next highest priority then becomes 
the standby command switch.