The SNMP trap that is generated when Dependent ports [oaPortLinSlavePorts] Link State became Up. as result of link reflection only. It should not be sent, when port became Up by physical connection or CLI command 'port state enable' - unlike standard LinkUp. In the case of [oaPortLinSymmetricStatus]='nonSymmetric' the Dependent ports are indeed the LIN Slave ports. But in the case of [oaPortLinSymmetricStatus]='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.