HP V1910 Switch Series User Manual page 52

Figure 26 Configure global parameters for the stack on Switch A
Type 192.168.1.1 in the text box of Private Net IP.

 Type 255.255.255.0 in the text box of Mask.
Select Enable from the Build Stack drop-down list.

Click Apply.

Now, switch A becomes the master switch.
# Configure a stack port on Switch A.
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