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Catalyst 2960 and 2960-S Switch Software Configuration Guide
OL-8603-09
Chapter 7 Managing Switch Stacks
Configuring the Switch Stack
Beginning in privileged EXEC mode, follow these steps to enable persistent MAC address. This
procedure is optional.
Use the no stack-mac persistent timer global configuration command to disable the persistent MAC
address feature.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
stack-mac persistent timer [0 | time-value] Enable a time delay after a stack-master change before the stack
MAC address changes to that of the new stack master. If the previous
stack master rejoins the stack during this period, the stack uses that
MAC address as the stack MAC address.
• Enter the command with no value to set the default delay of
4 minutes. We recommend that you always configure a value.
• Enter 0 to use the MAC address of the current master
indefinitely.
• Enter a time-value from 1 to 60 to configure the time period (in
minutes) before the stack MAC address changes to the new
master.
Caution When you enter this command, a warning states that traffic
might be lost if the old master MAC address appears
elsewhere in the network domain.
If you enter the no stack-mac persistent timer command after a new
stack master takes over, before the time expires, the stack uses the
current master MAC address.
Step 3
end Return to privileged EXEC mode.
Step 4
show running-config
or
show switch
Verify that the stack MAC address timer is enabled.
The output shows
stack-mac persistent timer and the time in
minutes.
The output shows
Mac persistency wait time with the number of
minutes configured and the stack MAC address.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.