Allied Telesis AR400 - Manual (Page 40)

Page 40 | AlliedWare™ OS How To Note: IGMP
IGMP throttling (limiting the number of streams for each subscriber) > Example
IGMP throttling (limiting the number of streams
for each subscriber)
IGMP throttling allows you to limit the number of streams that subscribers may access at a
given time, for example, to protect from bandwidth oversubscription. When the number of
multicast group memberships associated with a switch port reaches the configured limit, the
port can either deny further Membership Reports, or replace an existing membership with
the new group.
IGMP filtering and throttling can be applied separately or together. The switch applies the
filters first, then subjects any multicast group memberships passed by the filter to the limits
imposed by throttling.
IGMP Throttling is available in Software Version 2.7.5 or later.
Example
This example builds on "IGMP filtering (controlling multicast distribution)" on page 35 and
uses the same network configuration as "IGMP snooping" on page 9 . For convenience, the
diagram is reproduced below.
Multicast Server
AT-8948
Switch 1:
Querier
Rapier 24i
Switch 2:
Snooper
Client 1
Rapier 24i
Switch 3:
Snooper
Client 2
port 1
port 2 port 3
port 25 port 25
port 26 port 26
port 50
(blocked by STP)
port 49
igmp-snooper.eps