Brocade Communications Systems RFS6000 System Reference Manual page 258

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The IGMP Snoop Querier is used to keep host memberships alive. It is primarily used in a network
where there is a Multicast Streaming Server and hosts that subscribe to the Multicast server and
there is no IGMP Querier present. The switch can perform the role of an IGMP Querier. An IGMP
Querier sends out periodic IGMP Query packets. Interested hosts reply with IGMP Report packet.
IGMP Snooping is only done on wireless portals. IGMP Multicast packets are flooded on wired
ports.
To view and configure IGMP Snoop Querier Configuration details:
1. Select Network > IGMP Snooping from the main menu tree.
2. Select the IGMP Snoop Querier Config tab
Max Response Time Specifies the maximum allowed time before sending a responding report. When no reports are received from a
portal, that portal information is removed from the Snooping Table. The switch will only forward Multicast Packets to
portals that are present in the Snooping Table. For IGMP reports from wired ports, the switch forwards these reports
to the Multicast Router Ports.
Version Sets the IGMP version compatibility. Select from IGMP v1, v2, or v3.
IP Address This address is applied as the source address in the IGMP Query packet. This value is used as the default VLAN
Querier IP address.
Present Timeout This is the time duration after which the switch's IGMP Querier is activated. A Querier is used to accommodate any
query loss due to a Multicast Router being down or not accessible. It is also used to accommodate any local network
query loss. The Querier generates IGMP queries on receipt of which the interested hosts reply with an IGMP report.
On receipt of an IGMP report, the Snooping Table on the switch is updated with the host's portal information. Any
IGMP packet from the Multicast Server is then forwarded to the particular portal.
Interval This is the common interval in seconds between two IGMP Queries generated by the IGMP Querier. This is valid for all
VLANs.
VLAN Index The index of the selected VLAN.
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The IGMP Snoop Querier Config tab displays the following information:
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