Description: Each Entry is created as a row in the cl2natInterfaceConfigTable table when a user applies an instance to an interface/vlan combination, and removed when that instance is removed. A value of 0 in cl2natInterfaceVlanIndex indicates that this attachment is for untagged traffic. The result of this lookup is actually an index that is used to lookup the cl2natInstanceTable which gives the actual config of the instance attached.