SMC Networks SMC8624/48T manual Layer 2 Igmp Snooping and Query, 182

CONFIGURING THE SWITCH

Layer 2 IGMP (Snooping and Query)

IGMP Snooping and Query — If multicast routing is not supported on other switches in your network, you can use IGMP Snooping and Query (page 3-182)to monitor IGMP service requests passing between multicast clients and servers, and dynamically configure the switch ports which need to forward multicast traffic.

Static IGMP Router Interface — If IGMP snooping cannot locate the IGMP querier, you can manually designate a known IGMP querier (i.e., a multicast router/switch) connected over the network to an interface on your switch (page 3-186). This interface will then join all the current multicast groups supported by the attached router/switch to ensure that multicast traffic is passed to all appropriate interfaces within the switch.

Static IGMP Host Interface — For multicast applications that you need to control more carefully, you can manually assign a multicast service to specific interfaces on the switch (page 3-188).

Configuring IGMP Snooping and Query Parameters

You can configure the switch to forward multicast traffic intelligently. Based on the IGMP query and report messages, the switch forwards traffic only to the ports that request multicast traffic. This prevents the switch from broadcasting the traffic to all ports and possibly disrupting network performance.

Command Usage

•IGMP Snooping — This switch can passively snoop on IGMP Query and Report packets transferred between IP multicast routers/switches and IP multicast host groups to identify the IP multicast group members. It simply monitors the IGMP packets passing through it, picks out the group registration information, and configures the multicast filters accordingly.

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