It depends whether IGMP snooping is enabled or not. If it is, you need to have a querier on the local subnet. It can either be a real router configured for multicast or a switch configured with the following command:
ip igmp snooping querier
This command will cause the switch to send IGMP queries on a regular interval. The interested workstations will respond with IGMP membership report message, which will keep IGMP snooping happy.
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