Hi,
Please find my response:
Suppose if you are connecting 3rd switch to the topology as Daisy chain and starting replacing then you can replace switch 1 first but the probelm will occur when you will replace switch 2 because there would be no conncetivity between switch 1 switch 3.
Suppose you are implementing daisy chain as per the attachment:
Renumber the 3rd switch
irf member 1 renumber 3
save and reboot the 3rd switch.
Then you need below configuration:
Switch1:
++++++++
irf-port 1/1
port group interface Ten-GigabitEthernet1/0/49
#
save
irf-port-configuration active
Switch 2:
+++++++++
irf-port 2/1
port group interface Ten-GigabitEthernet2/0/49
#
irf-port 2/2
port group interface Ten-GigabitEthernet2/0/50
#
save
irf-port-configuration active
Switch 3:
+++++++++
irf-port 3/2
port group interface Ten-GigabitEthernet3/0/50
#
save
irf-port-configuration active
And if you want to change it to Ring topology then you need to connect Switch 3 interface tengig3/0/49 to Switch 1 interface tengig 1/0/50 and below configuration required (Pls refer attached diagram).
But pls make sure that for IRF ring we need more than 2 switches.
As I tested in LAB, in ring you can easily replace switch 1 & 2 one by one.
Switch 1:
+++++++++
irf-port 1/2
port group interface Ten-GigabitEthernet1/0/50
#
save
irf-port-configuration active
Switch 3:
+++++++++
irf-port 3/1
port group interface Ten-GigabitEthernet3/0/49
#
save
irf-port-configuration active
Thanks!