The value of the object sdpBndMldSnpgGrpV1HostExpTime indicates
the time remaining until the system will assume that
there are no longer any MLDv1 members on this SDP Bind.
Upon hearing any MLDv1 Membership Report, this value is reset to the
group membership interval. While this time remaining is non-zero,
the system ignores any MLDv2 'leave' messages for this
group that it receives on this SDP Bind.