HI Srinivas,
JMX console shows details about only 1 server at a time, however if you have servers running in cluster then you have to open that number of JMX consoles say you have two servers running in a cluster all_node1 running on port 8180 and all_node2 running on port 8280 then the URL for them would be like as follows
all_node1
http://localhost:8180/jmx-console/
all_node2
http://localhost:8280/jmx-console/
However if you need only one console to monitor all the nodes then JON which is
JBoss Operations Network would be the best options for you.