The value of tmnxOamVccvTrCtlSpokeSdpId specifies the spoke SDP
identifier to be used when performing a vccv-trace test on a FEC 129
pseudowire. This object is optional.
At most one of tmnxOamVccvTrCtlSdpIdVcId and
tmnxOamVccvTrCtlSpokeSdpId can be set to a non-default value on a
particular row.
A value of zero indicates that no spoke SDP identifier has been
configured.