The value of the internetwork layer address used as the transport address for LDP Hello messages in the global label space and for messages originating on unnumbered interfaces in RSVP. This must be an IPv4 address. See dcLmgrLsrEntityIpv6TranAddr, below, for the equivalent field for use in IPv6 networks. If the transport address is not set, then _lsr_id_ must be set to zero. In this case, the transport address and LSR ID are taken from an address on the Interface Information Interface. The IPv4 transport address provides the default ASON SC PC SCN address for this node. This is used in a UNI 2.0-capable system. To interact with a UNI 1.0-capable system, the IPv4 transport address must be identical to _lsr_id_.