Powering Considerations - Cisco 3750 Installation Manuallines

Planning the Stack

Powering Considerations

Note
Catalyst 3750 Switch Hardware Installation Guide
3-12
supplier. For cable numbers see the
The "Recommended Cabling Configurations" section on page 3-14
examples of recommended configurations.
• Access to the rear ports for unrestricted cabling.
Make sure that there is access to the rear of the rack if you are planning to
stack the switches. If you do not have access to the rear panel, make sure you
cable the switches before you rack mount them.
For concepts and procedures to manage switch stacks, refer to the switch
•
software configuration guide.
Consider the following guidelines before you power the switches in a stack:
• The sequence in which the switches are initially powered on might affect the
switch that becomes the stack master.
If you want a particular switch to become the stack master, power on that
•
switch first. This switch becomes the stack master and remains the stack
master until a master re-election is required. After approximately 10 seconds
power on the remaining switches in the stack.
If you have no preference as to which switch becomes the stack master, power
•
on the all the switches in the stack within a 10-second timeframe. These
switches participate in the stack master election. Switches powered on after
the 10-second timeframe do not participate in the election.
Power off a switch before you add it to or remove it from an existing switch
•
stack.
For conditions that can cause a stack master re-election, or to manually elect the
stack master, refer to the "Managing Switch Stacks" chapter in the switch
software configuration guide.
Chapter 3
"StackWise Ports" section on page
Switch Installation
2-14.
provides
78-15136-01