This is the interval (in seconds) after which a Leave message is forwarded on either router port(if present) or on all ports of a bridge (if no router port present). when a leave message from a host for a group is received by the bridge, The bridge will form a group-specific query and sends it on the port on which the leave message is received. A timer is started by a bridge with a time interval equal to IgsLeaveProcessInterval. If a report message is received before above timer expires, Leave message is dropped.Otherwise Leave message is either forwarded on all ports of the bridge or only on router port depending upon the case.