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Planning Switch Stacks
Before connecting the Catalyst 3750 switches in a stack, keep in mind these planning considerations:
• The size of the switch—See the"Technical Specifications" appendix of the Catalyst 3750 Switch
Hardware Installation Guide for the switch dimensions.
size makes it easier to cable the switches.
• Length of cable—Depending on the configuration of your switch stack, you might need
different-sized cables.
is supplied. If you require the 1-meter cable or 3-meter cable, you can order it from your Cisco
supplier. For cable numbers, see the Catalyst 3750 Switch Hardware Installation Guide.
For concepts and procedures for managing switch stacks, refer to the switch software
Note
configuration guide.
Powering Considerations
Consider these 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 20 seconds, power on the
remaining switches in the stack.
Stack master elections occur over a 10-second timeframe on switches running releases earlier
Note
than Cisco IOS Release 12.2(20)SE3.
For more information on stack master elections, see the "Managing Switch Stacks" chapter
in the switch software configuration guide.
If you do not specify the length of the StackWise cable, the 0.5-meter cable
Stacking together switches of the same
•
If you have no preference for which switch
becomes the stack master, power on all the
switches in the stack within a 20-second
timeframe. These switches participate in the
stack master election. Switches powered on
after the 20-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.
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