This attribute indicates which trunk modes to consider during route
selection. The operational mode attribute of the Trunk
PathAdministrator (Trk Pa) component specifies the mode of the
trunk. When selecting a route, RouteSelector can either consider
trunks with any mode, or only trunks with mode set to mapping.
That is, the selected route may contain trunks with any mode, or all
trunks with mode set to mapping.