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Catalyst 3750 Switch Software Configuration Guide
OL-8550-02
Chapter 5 Managing Switch Stacks
Configuring the Switch Stack
as the stack MAC address, even if the switch is now a stack member and not a stack master. You can also
configure stack MAC persistency so that the stack MAC address never changes to the new stack master
MAC address.
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 domain could result in lost traffic.
Beginning with Cisco IOS Release 12.2(35)SE, you can set 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 only option prior to this
release), 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 does not change.
• 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
command.
If the previous stack master does not rejoin the stack during this period, the switch stack uses the MAC
address of the new stack master as the stack MAC address.
Note If the entire switch stack reloads, it comes up with the MAC address of the stack master as the stack
MAC address.
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