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Data Stack Cabling Configurations
Figure 2-5
1
Figure 2-6
Figure
does not have redundant connections. In
two stacks, and the top and bottom switches become stack masters.
Figure 2-6
1
2
Figure 2-7
1
2
Power On Sequence for Switch Data Stacks
Consider these guidelines before you power on the switches in a stack:
•
•
•
•
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 on Cisco.com.
Catalyst 3750-X and 3560-X Switch Hardware Installation Guide
2-8
Example of a Data Stack with Half Bandwidth Connections
STACK 1
STACK 2
STACK 1
STACK 2
STACK 1
STACK 2
2
and
Figure 2-7
show data stacks of Catalyst 3750-X switches with failover conditions. In
2-6, the StackWise cable is bad in link 2. Therefore, this stack provides only half bandwidth and
Example of a Data Stack with a Failover Condition
STACK 1
STACK 2
STACK 1
STACK 2
3
STACK 1
STACK 2
Example of a Partitioned Data Stack with a Failover Condition
STACK 1
STACK 2
STACK 1
STACK 2
STACK 1
STACK 2
The sequence in which the switches are first 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
1 minute, power on the other 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 1 minute. These switches participate in the stack master election. Switches powered
on after 1 minute do not participate in the election.
Power off a switch before you add it to or remove it from an existing switch stack.
Figure
2-7, link 2 is bad. Therefore, this stack partitions into
Chapter 2
Switch Installation
OL-19593-03
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