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MultiCast Address and Port

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  • Java
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MulticastTest  tool:
http://download.oracle.com/docs/cd/E11035_01/wls100/admin_ref/utils.html#wp1199798

Setting up WebLogic Clusters
http://download.oracle.com/docs/cd/E11035_01/wls100/cluster/setup.html#wp700950

Cluster Multicast Address and Port
Identify the address and port you will dedicate to multicast communications for your cluster. A multicast address is an IP address between 224.0.0.0 and 239.255.255.255.

Note: The default multicast value used by WebLogic Server is 239.192.0.0. You should not use any multicast address with the value x.0.0.1.

Server instances in a cluster communicate with each other using multicast?athey use multicast to announce their services, and to issue periodic heartbeats that indicate continued availability.

The multicast address for a cluster should not be used for any purpose other than cluster communications. If the machine where the cluster multicast address exists hosts or is accessed by cluster-external programs that use multicast communication, make sure that those multicast communications use a different port than the cluster multicast port.

Multicast and Multiple Clusters
Multiple clusters on a network may share a multicast address and multicast port combination if necessary.

Multicast and Multi-Tier Clusters
If you are setting up the Recommended Multi-Tier Architecture, described in Cluster Architectures, with a firewall between the clusters, you will need two dedicated multicast addresses: one for the presentation (servlet) cluster and one for the object cluster. Using two multicast addresses ensures that the firewall does not interfere with cluster communication.

Multicast and Multiple Clusters
Multiple clusters on a network may share a multicast address and multicast port combination if necessary.

Troubleshooting Multicast Configuration
http://download.oracle.com/docs/cd/E11035_01/wls100/cluster/multicast_configuration.html


Connect cluster instead of sperate managed servers:
http://fixunix.com/weblogic/220928-clustering-set-up-question.html


WebLogic Server Communication in a Cluster
http://blog.csdn.net/pyliu8621/archive/2005/03/08/314920.aspx



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