The port number associated with the last HRE-X Filtering
COMMIT trap; the value depends on the value of the last
xylanFltLastCommitTrapReason. These are:
0 - The data is invalid.
1 - This data item is unused.
2 - This data item is unused.
3 - This data item is unused.
4 - The port that was assigned to two services.
5 - This data item is unused.
6 - This data item is unused.