Allied Telesis AR400 manual IGMP filtering controlling multicast distribution, Example

IGMP filtering (controlling multicast distribution) > Example

IGMP filtering (controlling multicast distribution)

IGMP filtering lets you control the distribution of multicast services on each switch port. Filtering is useful for subscription services when clients must be explicitly authorised to view a multicast stream.

IGMP Filtering is available in Software Version 2.7.5 or later.

Example

This example 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

The network contains a Windows 2000 workstation that regularly sends SVRLOC messages (an IGMP Membership Report for 224.0.1.22). This group gets added to the list of groups in vlan100 on switch 1, as shown in the following output of the show ip igmp command.

Manager Switch 1> show ip igmp

IGMP Protocol

------------------------------------------------------------------------

Status	Enabled
Default Query Interval	125	secs
Default Timeout Interval	260	secs

...
Interface Name	vlan100	(DR)
Group List
Group. 224.0.1.22	Last Adv. 172.31.0.99	Refresh time 251 secs
Ports 1

------------------------------------------------------------------------

We do not need to receive this multicast, so we will filter it out.

Page 35 AlliedWare™ OS How To Note: IGMP