a3ComPortPath
1.3.6.1.4.1.43.2.17.2.1.9
The Path which is assigned to this port. In some cases,
one or more Paths will be assigned to a single Port. This
object will return the lowest number Path in that case.
For those situations where more than one Port is assigned
to a single Path (e.g., nport), this object will return the
Path Index (or Parent Port).
This object must be specified when adding a new virtual port.
In the case where the dialpool (pool of dynamic dial paths)
is assigned to a port, a value of -1 will be used to indicate
that. When doing a get(read) of either a virtual or non-virtual
dial port, a return value of -1 indicates that the dialpool is
assigned to that port. A write(set) operation using a path number
value of -1 is required only in the case of creating a virtual
dynamic dial port; to create a non-virtual dynamic dial port,
setting this object is not required.