MQSeries.net :: View topic - real-timeOptimizedFlow multicast information

Duke

Hello,

I have to provide some support for a pub/sub solution that used multicast and the message broker and I have tried to figure out how the multicast solution is handle in the broker but I am not really sure about my conclusions (there are a lot of documentation that explains how to configure it i haven't find some that explain how does it work).

First for the configuration on the broker side, to enable multicasting you mainly need to
-> deploy a flow with an real-timeOptimizedFlow node where you can specify a port. It is documented that this port is used to received publish and subscribe request.
-> you have to enable multicast and configure it onto the broker. Among the parameters to define there are: the minimum and maximum address range and the Data Port (UDP port to receive and send multicast packets).

I use these information to argue the way that I have understood how the broker handles the multicast.

And it is here that I really need someone to check if I am not mistaken:

A JMS subscribers subscribes for a topic to the broker, for the connection it uses the ip address of the broker and the TCP port defined on the node. The IP address of the JMS subscriber has to be in the range of the multicast group IP (defined on the broker property).
The broker checks that the topic exists and register the interrest.
A JMS publisher publish a message to the broker on the TCP port defined in the node. The broker then broadcasts the message to the registered subscriber using the UDP protocol and through the Port defined in the Data port.

Thanks for help !!
_________________
Pierre Richelle

Engineer
IBM Certified MQSeries Developper V5.3
IBM Certified WMQ Administration V6