Subscriber Interest

Whenever possible, publishers send messages only to interested subscribers. That is, publishers send only those messages that match at least one subscriber content matcher. This behavior can reduce bandwidth consumption and can enhance subscriber performance in some situations.

This behavior extends across a transport bridge when the transports support it end-to-end (see Transport Bridge).

This support is automatic for TCP, RDMA and shared memory transports.

For multicast transports, the configuration must explicitly require subscriber interest and you must also configure the transport’s multicast groups to support bi-directional communication (that is, inbound and outbound) on the transport bus (see Multicast Send Group Multicast Transport: Parameters Reference and Multicast Send Group Multicast Transport: Parameters Reference). The two directions need not use the same multicast group. See Multicast Send Group Multicast Transport: Parameters Reference.