Answer Posted / supreetyadav
WebLogic Server uses IP multicast for all one-to-many
communications among server instances in a cluster. This
communication includes:
Cluster-wide JNDI updates—Each WebLogic Server instance in
a cluster uses multicast to announce the availability of
clustered objects that are deployed or removed locally.
Each server instance in the cluster monitors these
announcements and updates its local JNDI tree to reflect
current deployments of clustered objects. For more details,
see Cluster-Wide JNDI Naming Service.
Cluster heartbeats— Each WebLogic Server instance in a
cluster uses multicast to broadcast regular "heartbeat"
messages that advertise its availability. By monitoring
heartbeat messages, server instances in a cluster determine
when a server instance has failed. (Clustered server
instances also monitor IP sockets as a more immediate
method of determining when a server instance has failed.)
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