Allied Telesis AR400 manual Example, 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
	port 1	AT-8948
			Switch 1:
			Querier
	port 50	port 49
	(blocked by STP)
	port 26		port 26
Switch 2:	Rapier 24i		Rapier 24i	Switch 3:
Snooper	port 25		port 25	Snooper
	port 2		port 3
	Client 1		Client 2
				igmp-snooper.eps

Page 40 AlliedWare™ OS How To Note: IGMP