Powering Considerations - Cisco Catalyst 3750 Hardware Installation Manual

Chapter 3 Switch Installation

Powering Considerations

Note
Cabling Considerations
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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.
The illustrations in this section display cabling configuration examples that show
the stack bandwidth and possible stack partitioning.
Figure 3-2 shows an example of a stack of Catalyst 3750 switches that provides
full bandwidth and redundant StackWise cable connections.
Figure 3-2 Example of a Stack with Full Bandwidth Connections
A
B
C
Catalyst 3750 Switch Hardware Installation Guide
Planning the Stack
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