This table is a read-only table which gives the reserved port trigger information of the NAT module. Rows can neither be created nor be deleted using the rowstatus column. Rows are automatically created and deleted by NAT module. Port triggering is an important feature in NAT in which outbound traffic on predetermined ports ('triggering ports') causes inbound traffic on specific incoming ports to be dynamically forwarded to the initiating host. Reserved port Trigger table maintains the active port trigger session entries.