For information about forced fast-leave, see Forced fast-leave IGMP.
Syntax:
Enables IGMP forced fast-leave on the specified ports in the selected VLAN, even if they are cascaded.
The
noform of the command disables forced fast-leave on the specified ports in the selected VLAN.Use
show runningto display the ports per-VLAN on which forced fast-leave is enabled.
The fast learn option allows fast convergence of multicast traffic after a topology change. This command is executed in the global config context.
Syntax:
When enabled, this feature continues to filter IGMP groups for a specified additional period of time after IGMP leaves have been sent. The delay in flushing the group filter prevents unregistered traffic from being forwarded by the server during the delay period. In practice, this is rarely necessary on the switches, which support data-driven IGMP. (Data-driven IGMP, which is enabled by default, prunes off any unregistered IGMP streams detected on the switch.)
Syntax:
Where leaves have been sent for IGMP groups, enables the switch to continue to flush the groups for a specified period of time. This command is applied globally to all IGMP-configured VLANs on the switch.
Syntax:
For more information about unjoined multicast traffic, see Unjoined multicast traffic.