Hello Gokul,
Here is a procedure you could follow. (Note that here the master is switch1. But the procedure don't change much)
Before adding the new switch, ensure that you load the same IOS to the new switches so that there is no compatability issues arises when you connect them to stack.
Back up the current configuration.
Have a console cable connected to one of the switch in the stack which we are not going to replace
Do a wr memory to save any unsaved config
Issue show switch to verify the swithes configured priority.
------------------ show switch detail ------------------
Switch/Stack Mac Address : 2834.a221.2780
H/W Current
Switch# Role Mac Address Priority Version State
----------------------------------------------------------
*1 Master 2834.a221.2780 15 1 Ready
2 Member 4c00.82a7.0e00 12 1 Ready
3 Member 4c00.82a5.d080 6 1 Ready
4 Member 4c00.82b6.7700 3 1 Ready
Once it is done please follow the below for replacement.
Since we have to change the member and the master, i would advice to start it with member switch.
1. Power off the memberswitch to be removed
2. Remove the stack Wise cables from the member and install the new switch Powered off.
3. Connect the new switch to the stack using the stack cables.
4. Power on the newly added switch
5. Issue show switch to verify the new switch joined the stack once it is up.
Mater replacement
1. Power off the master switch . This will cause a re-election and switch 2 will become the master since it has next highest configured priority 12.
2. Remove the stack wise cables from it and install the new switch (powered off)
3. Reconnect the stack cables to add this switch to the stack
4. Power on the the switch and verify it joins the stack using sh switch.
5. If you want to make switch 1 back as master, relod the switch 2 (reload slot 2 or power off and power on switch 2) so that a master election takes place and switch 1 will come back as master switch since it has the highest configured priority.
Hope this helps and let me know if you need any more help.
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