The value of the object eMplsTEPLblIgmpSnpgGrpSrcExpTime indicates the minimum amount of time remaining before this entry will be aged out. If the value of eMplsTEPLblIgmpSnpgGrpSrcExpTime is non-zero and the value of eMplsTEPLblIgmpSnpgGrpFilterMode corresponding to this entry is 'include(1)', it means that there are currently one or more systems which desire to receive multicast traffic for this Source. If this timer expires and the value of eMplsTEPLblIgmpSnpgGrpFilterMode is 'include(1)', the system concludes that traffic from this particular Source is no longer desired on the attached network, and deletes this entry. If the value of eMplsTEPLblIgmpSnpgGrpSrcExpTime is non-zero and the filter-mode for the group is 'exclude(2)', it means that at least one system desires to receive multicast traffic from this source. If the value of eMplsTEPLblIgmpSnpgGrpSrcExpTime is zero and the filter-mode for the group is 'exclude(2)', it means that no system desires to receive multicast traffic from this Source.