igmp fastlearn
The fast learn option allows fast convergence of multicast traffic after a topology change. This command is
executed in the global config context.
Syntax:
[no] igmp fastlearn
port-list
This command enabled fast learn on the specified ports. The form of the command disables the fast learn function
on the specified ports.
Default: Disabled
To enable fastlearn on ports 5 and 6
switch(config)# igmp fastlearn 5-6
show igmp delayed-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 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:
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.
Preventing unjoined multicast traffic
For more information about unjoined multicast traffic, see
on page 34.
Syntax:
[no] igmp filter-unknown-mcast
Enables interface isolation for unjoined multicast groups. IGMP is configured so that each interface with IGMP
enabled will have a data-driven multicast filter associated with it, preventing unjoined IP multicast packets from
being flooded. A reboot is required for the change to take effect.
Default: Disabled
Configuring IGMP proxy (CLI)
For more information on IGMP proxy, see
IGMP general operation and features
on page 29.
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Aruba 3810 / 5400R Multicast and Routing Guide for ArubaOS-
Switch 16.08
