Communication

In order for there to be a cluster, the servers must communicate among themselves. Member servers use the TCP/IP communication facilities provided by their host operating system to communicate within the cluster. Communication occurs in one of two ways:

  • Peer-to-peer sockets

  • IP multicast

Peer-to-Peer Sockets

IP sockets are used for all nonbroadcast cluster communication. This includes:

  • Transmitting HTTP session states between peer WebLogic Server instances

  • Accessing clustered objects on a remote server in some multtier architectures

  • RMI communication with the client programs

Because all the members of a cluster need to know how to talk to each other, it is not possible to create a cluster whose member servers rely on DHCP addresses. ...

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