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Catalyst 3750 Switch Hardware Installation Guide
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Chapter 2 Switch Installation
Planning the Stack
• 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 up 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
Figure 2-2 shows an example of a stack of Catalyst 3750 switches with incomplete StackWise cabling
connections. This stack provides only half bandwidth and does not have redundant connections.
Figure 2-2 Example of a Stack with Half Bandwidth Connections
Figure 2-3 and Figure 2-4 show examples of stacks of Catalyst 3750 switches with failover conditions.
In Figure 2-3, the StackWise cable is bad in link B; therefore, this stack provides only half bandwidth
and does not have redundant connections. In Figure 2-4, link B is bad; therefore, this stack partitions into
two stacks, and switch 1 and switch 3 are stack masters.
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