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Clusters: Configuration: Multicast
Configuration Options Related Tasks Related Topics
This page allows you to define the messaging settings for this cluster. Clusters use messaging for sharing session, load balancing and failover, JMS, and other information between cluster members. Clusters can use either Unicast or Multicast messaging. Multicast is a simple broadcast technology that enables multiple applications to subscribe to a given IP address and port number and listen for messages, but requires hardware configuration and support. Unicast does not have these requirements.
Configuration Options
Name Description Messaging Mode Specifies the messaging type used in the cluster.
Multicast messaging, the default, is provided for backwards compatibility.
Unicast message is recommended for new clusters.
MBean Attribute:
ClusterMBean.ClusterMessagingMode
Unicast Broadcast Channel Specifies the channel used to handle communications within a cluster. If no channel is specified the default channel is used.
ClusterBroadcastChannel is only are supported if the unicast messaging type is used.
MBean Attribute:
ClusterMBean.ClusterBroadcastChannel
Changes take effect after you redeploy the module or restart the server.
Multicast Address The multicast address used by cluster members to communicate with each other.
The valid range is from from 224.0.0.0 to 239.255.255.255. The default value used by WebLogic Server is 239.192.0.0. You should avoid using multicast addresses in the range x.0.0.1
This address should be unique to this cluster and should not be shared by other applications.
MBean Attribute:
ClusterMBean.MulticastAddress
Changes take effect after you redeploy the module or restart the server.
Multicast Port The multicast port (between 1 and 65535) used by cluster members to communicate with each other.
Defines the multicast port used by cluster members to communicate with each other.
MBean Attribute:
ClusterMBean.MulticastPort
Minimum value:
1
Maximum value:
65535
Changes take effect after you redeploy the module or restart the server.
Multicast Send Delay The amount of time (between 0 and 250 milliseconds) to delay sending message fragments over multicast in order to avoid OS-level buffer overflow.
Defines the number of milliseconds to delay sending message fragments over multicast in order to avoid OS-level buffer overflow.
MBean Attribute:
ClusterMBean.MulticastSendDelay
Minimum value:
0
Maximum value:
250
Changes take effect after you redeploy the module or restart the server.
Multicast TTL The number of network hops (between 1 and 255) that a cluster multicast message is allowed to travel.
Defines the number of network hops that a cluster multicast message is allowed to travel. 1 restricts the cluster to one subnet.
MBean Attribute:
ClusterMBean.MulticastTTL
Minimum value:
1
Maximum value:
255
Changes take effect after you redeploy the module or restart the server.
Multicast Buffer Size The multicast socket send/receive buffer size (at least 64 kilobytes).
Returns the multicast socket send/receive buffer size.
MBean Attribute:
ClusterMBean.MulticastBufferSize
Minimum value:
64
Changes take effect after you redeploy the module or restart the server.
Idle Periods Until Timeout Maximum number of periods that a cluster member will wait before timing out a member of a cluster.
Maximum number of periods that a cluster member will wait before timing out a member of a cluster.
MBean Attribute:
ClusterMBean.IdlePeriodsUntilTimeout
Minimum value:
3
Changes take effect after you redeploy the module or restart the server.
Enable Data Encryption Enables multicast data to be incrypted. Only the multicast data is encrypted. Multicast header information is not encrypted.
MBean Attribute:
ClusterMBean.MulticastDataEncryption
Changes take effect after you redeploy the module or restart the server.
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