Multicast troubleshooting

The following hints and tips are in no significant order, and might be added to when new versions of the documentation are released. They are subjects that, if relevant to the work that we are doing, might save you time.

• Testing multicast applications on a non-multicast network
  Use this information to learn how to test IBM MQ Multicast applications locally instead of over a multicast network.
• Set the appropriate network for multicast traffic
  When developing or testing multicast applications, after testing them locally, you might want to test them over a multicast enabled network. If the application only transmits locally, you might have to edit the MQClient.ini file as shown later in this section. If the machine setup is using multiple network adapters, or a virtual private network (VPN) for example, the Interface parameter in the MQClient.ini file must be set to the address of the network adapter we want to use.
• Multicast topic string is too long
  If the IBM MQ Multicast topic string is rejected with reason code MQRC_TOPIC_STRING_ERROR, it might be because the string is too long.
• Multicast topic topology issues
  Use these examples to understand why certain IBM MQ Multicast topic topologies are not recommended.

Parent topic: IBM MQ Troubleshooting and support