Milan Technology MIL-SM2401M-STK - Manual (Page 109)

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65535. The switches must be assigned the same stacking group ID to be
stacked as a group.
6-3-8-8. IP Stacking Mode
Select one of the 3 modes to enable or disable the stacking function. To
configure the switch in the stacking group, use the Web GUI configuration
interface.
Disable: The stacking function is not enabled.
Master: One switch must be selected to control all other switches in stacking
group. Only one switch can be assigned to be the master switch in one stacking
group. Once the stacking group is set up, the master switch will control all
switches in the stacking group.
Slave: All remaining switches in a stacking group must be configured to slave
mode. Once the stacking group is set up, the slave switches can only be
configured through the master switch.
Note:
1. Before configuring the stacking function, make sure all stack switches are in
the same network.
2. To configure the stacking function, enable the master switch first.
3. After you have configured the stacking function, use Cat. 5 cable to connect
every switch in the stacking group.
4. To remove the master switch from stacking group, the slave switches must
be removed first. When all slave switches are removed, the master switch
can be removed from the stacking group.