Good Day, hope you are well

I’m fairly new to Zabbix, please help.

I have loaded switches on zabbix as an Network Generic Device by SNMP. And I seem to get all alerts except the most crucial one for me.

I need to get a Link Down/ Up alert when interfaces/ports go off and on.

I seem to get alerts when the speed of the interface/port change but not if it goes off and on.

Changed Macros of interfaces/ports. No help.