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Chapter 2 Cisco Catalyst Blade Switch 3120 for HP Cisco IOS Commands
stack-mac persistent timer
Use the stack-mac persistent timer global configuration command on the switch stack or on a standalone
switch to enable the persistent MAC address feature. When this feature is enabled, if the stack master
changes, the stack MAC address does not change for approximately four minutes, for an indefinite time
period, or for a configured time value. If the switch that was previously the stack master rejoins the stack
during this period, the stack continues to use its MAC address as the stack MAC address, even if the
switch is now a stack member. Use the no form of this command to return to the default setting.
This command is supported only on stacking-capable switches.
Note
Syntax Description
0
time-value
Defaults
Persistent MAC address is disabled. The MAC address of the stack is always that of the stack master.
When the command is entered with no value, the default time before the MAC address changes is
4 minutes. We recommend that you configure an explicit value for this command.
Command Modes
Global configuration
Command History
Release
12.2(40)EX1
Usage Guidelines
The MAC address of the switch stack is determined by the MAC address of the stack master. In the
default state (persistent MAC address disabled), if a new switch becomes stack master, the stack MAC
address changes to the MAC address of the new stack master.
When persistent MAC address is enabled, the stack MAC address does not change for approximately
four minutes. During that time, if the previous stack master rejoins the stack as a stack member, the stack
retains its MAC address for as long as the switch that has that MAC address is in the stack. If the
previous stack master does not rejoin the stack, the switch stack takes the MAC address of the new stack
master as the stack MAC address.
If the whole stack reloads, when it comes back up, the MAC address of the stack master is the stack MAC
address.
OL-12248-03
stack-mac persistent timer [0 | time-value]
no stack-mac persistent timer
(Optional) Enter to continue using the MAC address of the current stack master
after a new stack master takes over.
(Optional) Set the time period in minutes before the stack MAC address
changes to that of the new stack master. The range is 1 to 60 minutes. When no
value is entered, the default is 4 minutes. We recommend that you configure an
explicit value for this command.
Modification
This command was introduced.
Cisco Catalyst Blade Switch 3120 for HP Command Reference
stack-mac persistent timer
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