The value of vRtrMldIfGroupVer2HostTimer indicates
the time remaining until the local router will assume that
there are no longer any MLD version 2 members on the IP
subnet attached to this interface. Upon hearing any MLDv2
Membership Report, this value is reset to the group
membership timer. While this time remaining is non-zero,
the local router ignores any MLDv3 Leave messages for this
group that it receives on this interface.