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IGMP Global Setting
Web Smart switch interface
To manage IGMP Snooping global settings,
1. Click Configuration, IGMP Snooping, IGMP Snooping Setting.
2. Enable IGMP Snooping on the switch.
3. Modify other IGMP global settings as required.
4. Click Update.
Hint§
The following parameters are shown on the IGMP Snooping global settings page:
■ IGMP Snooping - When enabled, the switch will monitor network traffic to determine which hosts want to
receive multicast traffic. (Default: Disabled) 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. The switch monitors the IGMP packets passing through it, picks out the group registration information,
and configures the multicast filters accordingly.
■ IGMP Fast-Leave - Immediately deletes a member port of a multicast service if a leave packet is received on
that port. Fast Leave can improve bandwidth usage for a network which frequently experiences many IGMP host
add and leave requests. (Default: Disabled)
■ Unknown Multicast - When the table used to store multicast entries for IGMP snooping is filled, no new
entries are learned. If no router port is configured in the attached VLAN, any subsequent multicast traffic not
found in the table is either dropped or flooded throughout the VLAN. (Default: Drop)
■ Query Interval - Sets the frequency at which the switch sends IGMP host-query messages. (Range: 60-600
seconds, Default: 125)
■ Response Time - Set the time between receiving an IGMP Report for an IP multicast address on a port before
the switch sends an IGMP Query out of that port and removes the entry from its list. (Range: 10-25 seconds,
Default: 10)
■ Router Timeout - On a multicast network running IGMP, a Layer 3 multicast switch may exist that serves as
an IGMP querier responsible for sending IGMP query messages. The time the switch waits after the previous
querier stops before it considers it to have expired. (Range: 60-600 seconds, Default: 125)
■ Last Member Query Interval - The interval to wait for a response to a group-specific or
group-and-source-specific query message. (Range: 1-25 seconds, Default: 1 second)
■ Robustness Variable - Specify the robustness or expected packet loss for interfaces. The robustness value is
used in calculating the appropriate range for other IGMP variables. (Range: 1-255, Default: 2)
■ Host Timeout - The time the switch waits for an IGMP report from a host for a multicast group. When IGMP
reports are not received, host ports are removed from the member list of that multicast group.
■ Querier Election Time - The time the switch waits to receive IGMP queries from other routers. If no queries
are received, the switch itself will become the querier (when enabled).