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Catalyst 3750-X and 3560-X Switch Software Configuration Guide

OL-25303-03

Chapter 1 Managing Switch Stacks

Configuring the Switch Stack

These sections contain this configuration information:

• Default Switch Stack Configuration, page 1-24

• Enabling Persistent MAC Address, page 1-24

• Assigning Stack Member Information, page 1-26

• Running a Rolling Stack Update, page 1-28

Default Switch Stack Configuration

Table 1-3 shows the default switch stack configuration.

Enabling Persistent MAC Address

The switch stack MAC address is determined by the MAC address of the stack master. When a stack

master is removed from the stack and a new stack master takes over, the default is for the MAC address

of the new stack master to immediately become the new stack MAC router address. However, you can

enable the persistent MAC address feature to allow a time delay before the stack MAC address changes.

During this time period, if the previous stack master rejoins the stack, the stack continues to use its MAC

address as the stack MAC address, even if the switch is now a stack member and not a stack master. If

the previous stack master does not rejoin the stack during this period, the switch stack takes the MAC

address of the new stack master as the stack MAC address.You can also configure stack MAC persistency

so that the stack never switches to the MAC address of the new stack master.

Note When you enter the command to configure this feature, a warning message appears containing the

consequences of your configuration. You should use this feature cautiously. Using the old stack master

MAC address elsewhere in the same domain could result in lost traffic.

You can configure the time period as 0 to 60 minutes.

• If you enter the command with no value, the default delay is 4 minutes. We recommend that you

always enter a value. If the command is entered without a value, the time delay appears in the

running-config file with an explicit timer value of 4 minutes.

• If you enter 0, the stack MAC address of the previous stack master is used until you enter the no

stack-mac persistent timer command, which immediately changes the stack MAC address to that

of the current stack master. If you do not enter the no stack-mac persistent timer command, the

stack MAC address never changes.

Table 1-3 Default Switch Stack Configuration

Feature Default Setting

Stack MAC address timer Disabled.

Stack member number 1

Stack member priority value 1

Offline configuration The switch stack is not provisioned.

Cisco Catalyst 3560-X User Manual

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