tMacFilterType specifies which type of entries this mac filter
can contain.
If tMacFilterType is set to 'normal(1)', all match criteria
are accepted except the criteria mentioned below that belong to type
isid(2) and vid(3).
if tMacFilterType is set to 'isid(2)' the only accepted match
criteria for the filter entries are:
- tMacFilterParamsLowISID
- tMacFilterParamsHighISID
If tMacFilterType is set to vid(3) the only accepted match
criteria for the filter entries are:
- tMacFilterParamsInnerTagValue
- tMacFilterParamsInnerTagMask
- tMacFilterParamsOuterTagValue
- tMacFilterParamsOuterTagMask
tMacFilterType can only be changed if the filter is not applied
and has no entries.