SMC Networks SMC7724M/VSW manual Multicast Configuration

MULTICAST CONFIGURATION

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 multicast filters accordingly.

•IGMP Query – A router, or multicast-enabled switch, can periodically ask their hosts if they want to receive multicast traffic. If there is more than one router/switch on the LAN performing IP multicasting, one of these devices is elected “querier” and assumes the role of querying the LAN for group members. It then propagates the service requests on to any adjacent multicast switch/router to ensure that it will continue to receive the multicast service.

Note: Multicast routers use this information, along with a multicast routing protocol such as DVMRP, to support IP multicasting across the Internet.

Fields and Attributes

•IGMP Status – When enabled, the switch will monitor network traffic to determine which hosts want to receive multicast traffic. This is also referred to as IGMP Snooping. (Default: Disabled.)

•Act as IGMP Querier – When enabled, the switch can serve as the Querier, which is responsible for asking hosts if they want to receive multicast traffic. (Default: Disabled.)

•IGMP Query Count – Sets the maximum number of queries issued for which there has been no response before the switch takes action to solicit reports. (Default: 2, Range: 2 - 10.)

•IGMP Query Interval – Sets the frequency (in seconds) at which the switch sends IGMP host-query messages. (Default: 125,

Range: 60 - 125.)

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