Example – Allied Telesis AR400 User Manual
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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
. For
convenience, the diagram is reproduced below.
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.
We do not need to receive this multicast, so we will filter it out.
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
------------------------------------------------------------------------
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