Cisco Catalyst 3560E-24TD Przewodnik Instalacji Pobierz pdf (Strona 41)

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Catalyst 3750-E and Catalyst 3560-E Switch Hardware Installation Guide

OL-9774-04

Chapter 2 Switch Installation

Stack Cabling Configurations

Figure 2-7 and Figure 2-8 show examples of stacks of Catalyst 3750-E switches with failover conditions.

In Figure 2-7, the StackWise cable is bad in link B; therefore, this stack provides only half bandwidth

and does not have redundant connections. In Figure 2-8, link B is bad; therefore, this stack partitions into

two stacks, and switch 1 and switch 3 are stack masters.

Figure 2-7 Example of a Stack with a Failover Condition

Figure 2-8 Example of a Partitioned Stack with a Failover Condition

Power On Sequence for Switch Stacks

Consider these guidelines before you power on the switches in a stack:

• 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

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 a 1-minute timeframe. These switches participate in the stack master election.

Switches powered on after the 1-minute 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, see the

“Managing Switch Stacks” chapter in the switch software configuration guide on Cisco.com.

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Cisco Catalyst 3560E-24TD Przewodnik Instalacji Strona 41