Configuring a Multicast Group Address

A multicast group address is an Internet Protocol (IP) address in the range 224.0.0.0 to 239.255.255.255 that identifies the members of an IP multicast group. To efficiently broadcast the same message to all members of an IP multicast group, you configure each recipient with the same multicast group address and send the message to that address.

Table 91-5 summarizes which coordinated caches support multicast group address configuration.

Table 91-5 Coordinated Cache Support for Multicast Group Address Configuration

Coordinated Cache	Using TopLink Workbench	Using Java
JMS Coordinated Cache
RMI Coordinated Cache
CORBA Coordinated Cache
Custom Coordinated Cache

Note: Ensure your host and network are configured to support multicast operation before configuring this option.

In addition to configuring the multicast group address, you must also configure the multicast port (see "Configuring a Multicast Port") for the coordinated cache types shown in Table 91-5.

Using TopLink Workbench

To specify the multicast group address, use this procedure:

1. Select a session or session broker in the Navigator. Its properties appear in the Editor.

2. Click the Cache Coordination tab. The Cache Coordination tab appears.

3. Ensure the Enable Cache Coordination option is selected, then select the appropriate coordinated cache Type (see Table 91-5). The cache coordination options appear on the tab.

   Figure 91-3 Cache Coordination Tab, Multicast Group Address Field

   
   Description of "Figure 91-3 Cache Coordination Tab, Multicast Group Address Field"
   
   

4. Enter the multicast group address in the range 224.0.0.0 to 239.255.255.255 to subscribe this session to a given coordinated cache.