The index of the entry in the Port table to which
this path entry has been assigned. Unassigned entries
have a value of zero. This object allows adding and deleting
paths from ports.In order for any modifications to take
effect, the path(s) associated with this command must be
enabled(re-enabled if it is already enable).
Paths that have been assigned to the dialpool (pool of dynamic
dial paths) have port values of -1. For a read(get) operation,
a value of -1 will be returned if the path is not assigned to
any port but belongs to the dialpool. A write operation with
a value of -1 is not legal and will generate an error return.