Product guide

Multimedia Traffic Control with IP Multicast (IGMP)
How IGMP Operates
Configuring Delayed Group Flush
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
5300xl or 3400cl 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: igmp delayed-flush < time-period >
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. Range: 0 - 255; Default: Disabled (0).
Syntax: show igmp delayed-flush
Displays the current igmp delayed-flush setting.
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