The query function in IGMP can cause some unintended flooding in N:1 IPoE deployment model with AN in the IGMP snooping mode. By maintaining IGMP session states per host, it is assumed that the IGMP interaction between multicast receivers and the BNG are on a one-to-one basis. Upon arrival of an IGMP leave from a host for a specific multicast group, the IGMP querier would normally multicast a group-specific query (fast-leave). In N:1 model with SAP replication mode enabled, the 7750 SR and 7450 ESS sends a group-specific query (fast-leave) only when it receives the IGMP leave message for the last group shared amongst all subscribers on this SAP.