Cisco Catalyst 3650 Series, Command Reference Manual

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stack-mac update force
To update the stack MAC address to the MAC address of the active switch, use the stack-mac update force
command in EXEC mode on the active switch.
stack-mac update force
Syntax Description
This command has no arguments or keywords.
Command Default
None
Command Modes
User EXEC
Privileged EXEC
Command History
Modification Release
This command was introduced. Cisco IOS XE 3.3SECisco IOS XE 3.3SE
Usage Guidelines
By default, the stack MAC address is not changed to the MAC address of the new active switch during a high
availability (HA) failover. Use the
stack-mac update force command to force the stack MAC address to
change to the MAC address of the new active switch.
If the switch with the same MAC address as the stack MAC address is currently a member of the stack, the
stack-mac update force command has no effect. (It does not change the stack MAC address to the MAC
address of the active switch.)
If you do not change the stack MAC address, Layer 3 interface flapping does not occur. It also means that
a foreign MAC address (a MAC address that does not belong to any of the switches in the stack) could
be the stack MAC address. If the switch with this foreign MAC address joins another stack as the active
switch, two stacks will have the same stack MAC address. You must use the
stack-mac update force
command to resolve the conflict.
Note
Examples This example shows how to update the stack MAC address to the MAC address of the active switch:
Device> stack-mac update force
Device>
You can verify your settings by entering the show switch privileged EXEC command. The stack MAC address
includes whether the MAC address is local or foreign.
Command Reference, Cisco IOS XE Everest 16.5.1a (Catalyst 3650 Switches)
877
stack-mac update force