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(Optional) Configuring the MLD Message Suppression Time
Context
Multicast Listener Discovery (MLD) periodically sends Query and Response messages to maintain group memberships. If multiple members join the same multicast group, they all send Report messages of the multicast group to the MLD querier. As a result, the MLD querier receives duplicate Report messages. To reduce the number of MLD messages processed by the MLD querier, the downstream Layer 2 multicast devices can suppress duplicate Report messages. The default MLD message suppression time is 10 seconds. You can change the MLD message suppression time using a command.
After you set the MLD message suppression time on a Layer 2 multicast device, the device acts as follows:
- After the Layer 2 device receives an MLD Report message, it does not forward identical MLD Report messages to the router port within the suppression time.
- If the Layer 2 device receives an MLD General Query message or Multicast-Address-Specific Query message within the suppression time, it does not suppress the first MLD Report message sent in response to the Query message. In addition, the Layer 2 device resets the suppression timer when receiving the first MLD Report message.