Fail-over doesn't happen using fabric gateway-mq ?

Issue

1. using 3 windows 2008 r2 server each having a broker hosted in it (server1_b, server2_b, server3_b).

2. created a fabricroot and a gateway_mq container (server1_root, server1_gateway)

3. using the command fabric:join with zookeeper url joined all brokers and getway container to fabricroot.

4. create a child profile of replicated and assigned it to all the 3 brokers and gateway-mq's defaultVirtualHost pointing to above broker group.

5. now while sending messages to the gateway-mq url message created in server1_b ( broker1 ) and able to consume it also as it is the master . But when i stop the broker1 then the new master is server2_b (broker2 ) and server3_b (broker3) is its slave.

6. Now i am not able to send any message and also the pending messages from broker1 not replicating on broker2.