Name: SNMP_TRAP_LINK_DOWN Message: ifIndex <snmp-interface-index>, ifAdminStatus <admin-status>, ifOperStatus <operational-status>, ifName <interface-name> Help: linkDown trap was sent Description: The SNMP agent process (snmpd) generated a linkDown trap because the indicated interface changed state to 'down'. Type: Event: This message reports an event, not an error Severity: warning Facility: LOG_DAEMON
If this worked for you please flag my post as an "Accepted Solution" so others can benefit.
ifOperStatus down(2) indicates that you have an issue with your physical layer. So you need to check for issues related to cabling or sfp / port .Check the same things on the other side of the connection too.