The SNMP trap that is generated when Dependent ports [mrvPortLinSlavePorts] Link State became Down as result of link reflection only. It should not be sent, when port became Down by physical disconnection or CLI command 'port state disable' - unlike standard LinkDown. In the case of [mrvPortLinSymmetricStatus]='nonSymmetric' the Dependent ports are indeed the LIN Slave ports. But in the case of [mrvPortLinSymmetricStatus]='symmetric' the Dependent ports list has only one port which can be Master port or Slave port, because in this case these both ports are equivalent.