AirLive SNMP-GSH2402 - Manual (Page 115)

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M Check:
Migration Check. It forces the port sending out an RSTP BPDU instead
of a legacy STP BPDU at the next transmission. The only benefit of this
operation is to make the port quickly get back to act as an RSTP port.
Click button to send a RSTP BPDU from the port you
specified.
Fig. 3-48