This object specifies the identity of the physical port whose state is to be monitored. Each bit is a port of the system. Default value is 0. If this object is configured then the Preference Level of this interface will be adjusted dynamically depending on the state of the Track Port. The interface's Preference Level is reduced by value of Preference Level parameter when the Track Port states first changes from UP to DOWN. When the Track Port next comes up the interface's Preference Level is increased by the amount specified by the Preference Level. The Chassis router FSRP Track port membership. (It was obsoleted after release 07100, replaced by snFsrpIfTrackPortList)