Cluster not forming when using customize TCP stack in RH Data-Grid 8

Issue

1. All Nodes not forming cluster.
2. Nodes from clusterA trying to ping to other clusterB member.
3. Nodes still using MPING even TCPPING is define in Customize TCP Stack

To use Customize TCP stack, If default tcp stack is inherited using (stack name=”tcp-ping” extends=”tcp”) then adding only TCPPING will not work.

<jgroups> 
    <stack name="custom_tcp"> 
      <TCP bind_port="7800" port_range="30" recv_buf_size="20000000" send_buf_size="640000"/>
      <TCPPING
           initial_hosts="${jgroups.tcpping.initial_hosts:x.x.x.x[7800], x.x.x.x[7800], x.x.x.x[7800], 
            x.x.x.x[7800], x.x.x.x[7800], x.x.x.x7800]}" 
          port_range="0"/>
      <MERGE3 />
      <FD_SOCK />
      <FD_ALL timeout="3000" interval="1000" timeout_check_interval="1000" />
      <VERIFY_SUSPECT timeout="1000" />
      <pbcast.NAKACK2 use_mcast_xmit="false" xmit_interval="200" xmit_table_num_rows="50"
                      xmit_table_msgs_per_row="1024" xmit_table_max_compaction_time="30000" />
      <UNICAST3 xmit_interval="200" xmit_table_num_rows="50" xmit_table_msgs_per_row="1024"
                xmit_table_max_compaction_time="30000" conn_close_timeout="5000" />                                             
      <pbcast.STABLE desired_avg_gossip="2000" max_bytes="1M" />                   
      <pbcast.GMS print_local_addr="false" join_timeout="${jgroups.join_timeout:2000}" />
      <UFC max_credits="4m" min_threshold="0.40" />
      <MFC max_credits="4m" min_threshold="0.40" />
      <FRAG3 />
    </stack>
  </jgroups>

Node having above TCP stack configuration has below warning in server.log and not joining to form cluster.

WARN (MPING-5,node1address) [org.jgroups.protocols.MPING] : discarding discovery request for cluster 'CLUSTER A' from : our cluster name is ' CLUSTER A'. Please separate your clusters properly 

Also In server.conf ,the system properties "-Djboss.default.jgroups.stack and -Djboss.bind.address" that are set during your startup does not take any effect in RHDG 8.x.