The operational status of the IGMP feature for this
port or trunk indicates whether any IGMP V2 Leaves
received for an IP Multicast group will cause the
group to be deleted after the
hpSwitchIgmpForcedLeaveInterval if no new IGMP V2
Reports are received for that group. Normal behavior
is for a group issuing a Leave to be deleted after
the Querier's Maximum Response time if no IGMP V2
Report is received.