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Configuring the MLD Version
Context
A multicast router can identify Multicast Listener Discovery (MLD) messages of a version earlier than its own MLD version but cannot identify MLD messages of a later version. To ensure normal MLD operation, ensure that the router runs the same MLD version as receiver hosts or a later MLD version.
If there are multiple multicast routers on a shared network segment of hosts, all host-side interfaces of these multicast routers must run the same MLD version. If they are running different MLD versions, MLD cannot function normally on the network.