SMC Networks SMC8150L2 manual Igmp Filtering and Throttling, Igmp Member Port Table

Multicast Filtering 3

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 3-102 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.

Console(config)#ip igmp snooping vlan 1 static 224.1.1.12
ethernet 1/12				4-202
Console(config)#exit
Console#show mac-address-table multicast vlan 1				4-205
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#

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 multcast 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.

IGMP throttling sets a maximum number of multicast groups that a port can join at the same time. When the maximum number of groups is reached on a port, the switch can take one of two actions; either “deny” or “replace.” If the action is set to deny, any new IGMP join reports will be dropped. If the action is set to replace, the

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