Use this tab to configure the address and port upon which the server instances in a cluster broadcast service availability and heart beat messages. It is most efficient to dedicate the multicast address and port to a single cluster, although multiple WebLogic Server clusters can share a single multicast address and port. No other applications should broadcast or subscribe to the multicast address and port used by your cluster or clusters.

Attribute Label	Description	Value Constraints
Multicast Address	Defines the multicast address used by cluster members to communicate with each other. MBean: weblogic.management. configuration.ClusterMBean Attribute: MulticastAddress	Default: "237.0.0.1" Configurable: yes Readable: yes Writable: yes
Multicast Port	Defines the multicast port used by cluster members to communicate with each other. MBean: weblogic.management. configuration.ClusterMBean Attribute: MulticastPort	Minimum: 1 Maximum: 65535 Default: 7001 Configurable: yes Readable: yes Writable: yes
Multicast Send Delay	Defines the number of milliseconds to delay sending message fragments over multicast in order to avoid OS-level buffer overflow. MBean: weblogic.management. configuration.ClusterMBean Attribute: MulticastSendDelay	Minimum: 0 Maximum: 100 Default: 12 Configurable: yes Readable: yes Writable: yes
Multicast TTL	Defines the number of network hops that a cluster multicast message is allowed to travel. 1 restricts the cluster to one subnet. MBean: weblogic.management. configuration.ClusterMBean Attribute: MulticastTTL	Minimum: 1 Maximum: 255 Default: 1 Configurable: yes Readable: yes Writable: yes
Multicast Buffer Size	Defines the multicast socket send/receive buffer size. MBean: weblogic.management. configuration.ClusterMBean Attribute: MulticastBufferSize	Units: kilobytes Minimum: 64 Default: 64 Readable: yes Writable: yes

Attribute Label

Description

Value Constraints

Multicast Address

Defines the multicast address used by cluster members to communicate with each other.

MBean: weblogic.management.
configuration.ClusterMBean

Attribute: MulticastAddress

Default: "237.0.0.1"

Configurable: yes

Readable: yes

Writable: yes

Multicast Port

Defines the multicast port used by cluster members to communicate with each other.

MBean: weblogic.management.
configuration.ClusterMBean

Attribute: MulticastPort

Minimum: 1

Maximum: 65535

Default: 7001

Configurable: yes

Readable: yes

Writable: yes

Multicast Send Delay

Defines the number of milliseconds to delay sending message fragments over multicast in order to avoid OS-level buffer overflow.

MBean: weblogic.management.
configuration.ClusterMBean

Attribute: MulticastSendDelay

Minimum: 0

Maximum: 100

Default: 12

Configurable: yes

Readable: yes

Writable: yes

Multicast TTL

Defines the number of network hops that a cluster multicast message is allowed to travel. 1 restricts the cluster to one subnet.

MBean: weblogic.management.
configuration.ClusterMBean

Attribute: MulticastTTL

Minimum: 1

Maximum: 255

Default: 1

Configurable: yes

Readable: yes

Writable: yes

Multicast Buffer Size

Defines the multicast socket send/receive buffer size.

MBean: weblogic.management.
configuration.ClusterMBean

Attribute: MulticastBufferSize

Units: kilobytes

Minimum: 64

Default: 64

Readable: yes

Writable: yes