Brocade Mobility RFS7000-GR Controller System Reference Guide (Supporting software release 4.1.0.0-040GR and later) - Manual (Page 246)

232 Brocade Mobility RFS7000-GR Controller System Reference Guide
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IGMP Snooping
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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
The IGMP Snoop Querier Config tab displays the following information:
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 accomodate any query loss due to a Multicast Router being
down or not accessible. It is also used to accomodate 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.
Enable The enable state of IGMP Snoop Querier on this VLAN.