The igmp on-demand command configures entries of dynamically joined IGMP groups not to age on a specified interface.
The undo igmp on-demand command restores the default configuration.
By default, entries of dynamically joined IGMP groups age periodically on a specified interface
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Usage Scenario
igmp on-demand enables a host to become a static data receiver of a multicast group on a multicast device's interface connected to an access device, thus reducing packet exchanges and workloads of the multicast and access devices. To enable this function, run the igmp on-demand command, so that entries of dynamically joined IGMP groups will not age on a specified interface.
This command applies only to IGMPv2 and IGMPv3 interfaces connected to access devices, not to user hosts.Configuration Impact
The igmp on-demand command configuration does not take effect for existing entries of dynamically joined IGMP groups.
Precautions
After the igmp on-demand command is used on a multicast device directly connected to an IGMP proxy-capable access device, the following situations occur: