Enabling Persistent Mac Address - Cisco 3032 Software Configuration Manual

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Configuring the Switch Stack

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.

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 the entire switch stack reloads, it uses with the MAC address of the stack master as the stack MAC

Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide

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.

If you enter a time delay of 1 to 60 minutes, the stack MAC address of the previous stack master is

used until the configured time period expires or until you enter the no stack-mac persistent timer

Managing Switch Stacks

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