IGMP router behavior during LMQT period

Hi,
   
  I had a question regarding the expected router behavior during the last member query timeout(LMQT) period. Consider 2 IGMPv3 hosts, H1 and H2 sitting on a LAN. Both have subscribed to a group G1. Host H1 now sends a leave for the group G1. On receiving this the querier would reduce its GMI to LMQT and schedule RV number of group specific queries to be sent, one every last member query interval (LMQI) seconds. Since IGMPv3 state change records are retransmitted by the host to guard against packet loss, H1 would retransmit its Leave (TO_INCLUDE{}) after the unsolicited report interval. What should the router do on receiving this leave? 
   
  a) Should it reset the group timer LMQT again and again send out RV number of group specific queries 
  OR
  b) Should it simply ignore this leave?
   
  If it is (b), what should it do if it gets a leave from the other host H2 also during this LMQT period(i.e. H2 leaves the group immediately after sending an overriding join in response to the first group specific query)? Shouldn't that be treated as described in (a)? But how can the router distinguish between leaves from 2 different hosts unless it is explicitly tracking hosts?
   
  Thanks,
  Princy

       
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