User`s manual

NPort S8000 Series Switch Featured Functions
6-34
IGMP (Internet Group Management Protocol)
Snooping Mode
Snooping Mode allows your switch to forward multicast packets only to the appropriate ports. The switch
“snoops” on exchanges between hosts and an IGMP device, such as a router, to find those ports that want to
join a multicast group, and then configures its filters accordingly.
Query Mode
Query mode allows the NPort S8000 to work as the Querier if it has the lowest IP address on the subnetwork
to which it belongs. IGMP querying is enabled by default on the NPort S8000 to help prevent interoperability
issues with some multicast routers that may not follow the lowest IP address election method. Enable query
mode to run multicast sessions on a network that does not contain IGMP routers (or queriers).
NOTE
The NPort S8000 is compatible with any device that conforms to
the IGMP v2 and IGMP v3 device protocol.
Configuring IGMP Snooping
IGMP Snooping provides the ability to prune multicast traffic so that it travels only to those end destinations
that require that traffic, thereby reducing the amount of traffic on the Ethernet LAN.
IGMP Snooping Settings
IGMP Snooping Enable
Setting Description Factory Default
Enable/Disable Select the option to enable the IGMP Snooping function
globally.
Disabled
Query Interval
Setting Description Factory Default
Numerical value input
by user
Set the query interval of the Querier function globally. Valid
settings are from 20 to 600 seconds.
125 seconds
IGMP Snooping
Setting Description Factory Default
Enable/Disable Select the option to enable the IGMP Snooping function per
VLAN.
Enabled if IGMP
Snooping Enabled
Globally
Querier
Setting Description Factory Default
Enable/Disable Select the option to enable the NPort S8000’s querier function. Enabled if IGMP