The value of the object sapIgmpSnpgGrpV2HostExpTime indicates
the time remaining until the system will assume that
there are no longer any IGMPv2 members on the SAP.
Upon hearing any IGMPv2 Membership Report, this value is reset to the
group membership interval. While this time remaining is non-zero, the
system ignores any IGMPv3 'leave' messages for this group that it
receives on this SAP.