The UDP or TCP port number used as a destina-
tion port for all senders in this session. If
the IP protocol in use, specified by rsvpSen-
derProtocol, is 50 (ESP) or 51 (AH), this
represents a virtual destination port number.
A value of zero indicates that the IP protocol
in use does not have ports. This object may
not be changed when the value of the RowStatus
object is 'valid'.