Specifies the originating SDP-ID to be used for performing
a sdp-ping or mtu-ping operation. This parameter is required
only if tmnxOamPingCtlTestMode has a value of either 'sdpPing'
or 'mtuPing'.
The far-end address of the specified SDP-ID is the expected
responder-id within each OAM reply message received. The
specified SDP-ID defines the encapsulation of the SDP tunnel
encapsulation used to reach the far-end. This can be IP/GRE
or MPLS. The value of tmnxOamPingCtlFcName is used to define
the outgoing forwarding class used for the SDP encapsulation.
If the value of tmnxOamPingCtlOrigSdpId is invalid, or the SDP
is administratively down, or unavailable, the OAM Echo request
message probe is not sent and an appropriate error value is
written to tmnxOamPingHistoryStatus for that probe entry. Once
the interval timer expires, the next probe attempt will be made
if required.