Why Does the Subscriber Fail to Receive Messages After I Publish Messages to the Topic?

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After subscribing to a topic, the subscriber receives a confirmation notification. If not confirming the subscription, the subscriber cannot receive messages you published to the topic.



Other related questions:
Can I Delete a Published Message?

No. A message cannot be deleted once it is published.


Does an S series switch sends a Report message after receiving a Query message
If only IGMP snooping is enabled, an S series switch does not send Report messages after receiving Query messages. If IGMP snooping proxy or IGMP snooping Report suppression is also configured, the switch can construct and send Report messages according to existing entries after receiving Query messages.

Why is multicast forwarding interrupted on an interface after the interface receives Hello messages
After static IGMP groups are configured on an interface, the device uses the PIM protocol to set up multicast forwarding entries. Multicast data can be forwarded through the interface as long as the interface is included in the downstream interface list in the corresponding multicast forwarding entry. If the source address of a received PIM Hello message is larger than the interface address, or the DR priority of the PIM Hello message is larger than the priority of the interface, the switch can no longer function as the DR. All data packets on a shared network segment are forwarded by the DR is no Assert election occurs. Therefore, the device considers that multicast data packets will be forwarded by the new DR and then prunes the downstream interface.

Why the Picture in the Email Message I Received Cannot Be Displayed?

Some email clients disable automatic picture download from the Internet by default for the sake of privacy protection. If the picture cannot be displayed in the email, you need to enable automatic picture download.


How Many Messages Can Be Published to a Topic?

The number of messages published to a topic is not limited.


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