Changing the master switch in a stack

[rasmus.elmholt]

Hi

I have a stack of 2 Cat9200 switch and when they booted switch 2 became the master.

How do I change this without any downtime?

SW-1#show switch
Switch/Stack Mac Address : ****.****.**** - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
-------------------------------------------------------------------------------------
1 Standby ****.****.***0 10 V01 Ready
*2 Active ****.****.***1 1 V02 Ready

[balaji.bandi]

you need to set a priority so the switch 1 always become master

below command help you to change prioty ( make switch 1 as 15 and Switch 2 14)

switch stack-member-number priority new- priority-number

[luis_cordova · Accepted solution]

Hi @rasmus.elmholt,

Unfortunately, every change of active switch needs a reset of the switchs:

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9200/software/release/16-10/configuration_guide/stck_mgr_ha/b_1610_stck_mgr_ha_9200_cg/managing_switch_stacks.html#concept_j2w_shc_31b

Switch Stack Configuration Scenarios

Most of these switch stack configuration scenarios assume that at least two devices are connected through their StackWise ports.

Table 2. Configuration ScenariosScenarioResult

Active switchelection specifically determined by existing active switches	Connect two powered-on switch stacks through the StackWise ports.	Only one of the two active switchesbecomes the new active switch.
Active switchelection specifically determined by the stack member priority value	Connect two switches through their StackWise ports. Use the switch stack-member-number priority new-priority-number command to set one stack member with a higher member priority value. Restart both stack members at the same time.	The stack member with the higher priority value is elected active switch.
Active switchelection specifically determined by the configuration file	Assuming that both stack members have the same priority value: Make sure that one stack member has a default configuration and that the other stack member has a saved (nondefault) configuration file. Restart both stack members at the same time.	The stack member with the saved configuration file is elected active switch.
Active switchelection specifically determined by the MAC address	Assuming that both stack members have the same priority value, configuration file, and license level, restart both stack members at the same time.	The stack member with the lower MAC address is elected active switch .

Regards