The value of vLdpServFec129NumInLabels gives the number of
labels that have been sent to the peer associated with this
FEC. This value also indicates whether vLdpServFec129InLabel1 entry
contain valid information i.e. if the value of
vLdpServFec129NumInLabels is 1 then vLdpServFec129InLabel1
will contain valid label information.