There is two nodes: A, B. They are in one group, then we cut off the network 
cable of A then we notice from the log that two of them are in a single group. 
After plug in back the network cable into the A then they merged together but 
none of them get the actual state of the other.

Our configuration:
<UDP send_on_all_interfaces="true" receive_on_all_interfaces="true" 
mcast_addr="228.1.2.3" mcast_port="48866"
                    ip_ttl="64" ip_mcast="true"
                    mcast_send_buf_size="150000" mcast_recv_buf_size="80000"
                    ucast_send_buf_size="150000" ucast_recv_buf_size="80000"
                    use_incoming_packet_handler="false" 
use_outgoing_packet_handler="false"
                    loopback="false"/>
                <PING timeout="2000" num_initial_members="3"
                    up_thread="true" down_thread="true"/>
                <MERGE2 min_interval="10000" max_interval="20000"/>
                    <FD shun="true" up_thread="true" down_thread="true"
                   timeout="2500" max_tries="5"/>
                <VERIFY_SUSPECT timeout="1500"
                    up_thread="false" down_thread="false"/>
                <pbcast.NAKACK gc_lag="50" 
retransmit_timeout="600,1200,2400,4800"
                    max_xmit_size="8192" up_thread="false" down_thread="false"/>
                <UNICAST timeout="600,1200,2400" window_size="100" 
min_threshold="10"
                    down_thread="false"/>
                <pbcast.STABLE desired_avg_gossip="20000"
                
                    up_thread="false" down_thread="false"/>
                <FRAG frag_size="8192"
                    down_thread="false" up_thread="false"/>
                <pbcast.GMS join_timeout="5000" join_retry_timeout="2000"
                    shun="true" print_local_addr="true"/>

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