Group communication protocols are used in fault-tolerant systems to maintain strong replica consistency. The FaultTolerant Multicast Protocol (FTMP) described here is a group communicationprotocol specificallydesigned for the Common Object Request Broker Architecture (CORBA). FTMP operates over IP Multicast, and consists of the Reliable Multicast Protocol (RMP) that provides reliable source-ordered message delivery, the Reliable Ordered Multicast Protocol (ROMP) that provides reliable totallyordered message delivery, and the Processor Group Membership Protocol (PGMP) that provides processor group membership services.
Louise E. Moser, P. M. Melliar-Smith, Ruppert R. K