D-Link 16-Port 10/100/1000Mbps Gigabit Ethernet Switch + 2-Port Mini GBIC Web-Smart Switch DGS-1216T - Manual (Page 45)

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Configure SNMP Trap:
Figure 29. Configure SNMP Trap Setting
Trap authentication fail: When checked the dialog box of the
Trap authentication fail, when fail to authentication, the Switch
will trap the authentication fail even to the SNMP host.
Add Trap: To create a recipient of SNMP traps generated by the
Switch’s SNMP agent, press “Add Trap” button, and the SNMP
Trap Set window will pop out; you can fill in the community name
and trap IP address of the remote management station that will
serve as the SNMP host for the Switch and checked the events
selection to enabled selected event traps.
Figure 30. Add SNMP Trap