Planet SGSW-24040 User Manual page 336

 Select the switch with ID=1 and assign a new ID for this unit, for example: ID=4
 Select the target switch and set up with lower priority "1", also re-assing the Switch ID=1 for it. After click Save,
click "Start Master Election" and save again.
Figure 4-17-14 Assing lower priority value fo the target switch
 Reflash the web browser, the switch with MAC address "00-30-4f-76-27-10" become the stack master now.
Figure 4-17-13 Assing new ID for current master
Figure 4-17-15 The result after master election
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User's Manual of SGSW-24040 / 24240 Series