Installation guide

Chapter 2 Switch Installation
Planning the Stack
2-12
Catalyst 3750 Switch Hardware Installation Guide
OL-6336-01
Powering Considerations
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 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.
Note For conditions that can cause a stack master re-election or to manually elect the
stack master, see the “Managing Switch Stacks” chapter in the switch software
configuration guide.
Cabling Considerations
The illustrations in this section display cabling configuration examples that show
the stack bandwidth and possible stack partitioning.
Figure 2-1 shows an example of a stack of Catalyst 3750 switches that provides
full bandwidth and redundant StackWise cable connections.
Figure 2-1 Example of a Stack with Full Bandwidth Connections
86821
A
B
C