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Configuring the Switch
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• Multicast IP – The IP address for a specific multicast service
• Port or Trunk – Specifies the interface attached to a multicast router/switch.
Web – Click IGMP Snooping, IGMP Member Port Table. Specify the interface
attached to a multicast service (via an IGMP-enabled switch or multicast router),
indicate the VLAN that will propagate the multicast service, specify the multicast IP
address, and click Add. After you have completed adding ports to the member list,
click Apply.
Figure 3-135 IGMP Member Port Table
CLI – This example assigns a multicast address to VLAN 1, and then displays all the
known multicast services supported on VLAN 1.
IGMP Filtering and Throttling
In certain switch applications, the administrator may want to control the multicast
services that are available to end users. For example, an IP/TV service based on a
specific subscription plan. The IGMP filtering feature fulfills this requirement by
restricting access to specified multicast services on a switch port, and IGMP
throttling limits the number of simultaneous multicast groups a port can join.
IGMP filtering enables you to assign a profile to a switch port that specifies multicast
groups that are permitted or denied on the port. An IGMP filter profile can contain
one or more, or a range of multicast addresses; but only one profile can be assigned
to a port. When enabled, IGMP join reports received on the port are checked against
the filter profile. If a requested multicast group is permitted, the IGMP join report is
forwarded as normal. If a requested multicast group is denied, the IGMP join report
is dropped.
Console(config)#ip igmp snooping vlan 1 static 224.1.1.12
ethernet 1/12 4-288
Console(config)#exit
Console#show mac-address-table multicast vlan 1 4-291
VLAN M'cast IP addr. Member ports Type
---- --------------- ------------ -------
1 224.1.1.12 Eth1/12 USER
1 224.1.2.3 Eth1/12 IGMP
Console#