Cisco 3750 - Catalyst EMI Switch Руководство по началу работы - Страница 10

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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.

If you don't specify the length of the StackWise cable, the 0.5-meter cable 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.

Note

For concepts and procedures to manage switch stacks, refer to the switch software

configuration guide.

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 20 seconds, power on the

remaining switches in the stack.

Note

Stack master elections occur over a 10-second timeframe on switches running releases earlier

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.

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.