Cisco Systems 3750E manual Configuring the Switch Stack, Default Switch Stack Configuration

Chapter 5 Managing Switch Stacks

Configuring the Switch Stack

Configuring the Switch Stack

These sections contain this configuration information:

•Default Switch Stack Configuration, page 5-20

•Enabling Persistent MAC Address, page 5-20

•Assigning Stack Member Information, page 5-22

Default Switch Stack Configuration

Table 5-3shows the default switch stack configuration.

Table 5-3	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.

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.

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

5-20 OL-9775-02