Install guide

28 Software Reference
IGMP Throttling
IGMP throttling lets you manage the distribution of multicast services on each
switch port by limiting the number of multicast groups that a host on a switch
port can join.
IGMP throttling is applied to multicast streams forwarded by IGMP, IGMP
Snooping, or MVR.
IGMP filtering and throttling can be applied separately, or together, on the
same switch port. Filtering is applied first, and any multicast group
memberships passed by the filter are further subjected to the limits imposed by
throttling. For more information about IGMP filtering, see “IGMP Filtering” on
page 26.
IGMP throttling controls the maximum number of multicast groups that a port
can join. When the number of multicast group memberships associated with a
switch port reaches the limit set, further Membership Reports are subject to a
throttling action—deny or replace.
If you configure a throttling action of deny, when the multicast group
membership associated with the port reaches the set limit, additional
Membership Reports from that switch port are denied until old membership
entries are aged out.
If you configure a throttling action of replace, when the multicast group
membership associated with the port reaches the set limit, additional
Membership Reports from that switch port replace existing membership
entries.
Static associations of switch ports and multicast groups are counted in the
number of multicast group memberships, but they are not affected by the
throttling action.
Configuring IGMP
throttling
To enable IGMP throttling on a switch port, set the maximum number of group
memberships and the throttling action to take, by using the command:
set switch port={port-list|all} igmpmaxgroup=1..65535
igmpaction={deny|replace} [other-options...]
To disable IGMP throttling on a switch port, set the maximum number of
group memberships to none by using the command:
set switch port={port-list|all} igmpmaxgroup=none
[other-options...]
To display the IGMP throttling settings for a switch port, use the command:
show switch port[={port-list|all}]