Fujitsu PRIMERGY 10/40GbE Connection Blade 18/8+2 Function Manual page 32

Points to be noted
Communication may not be possible when performing the multicast communication without using the

IGMP.
Set the port connected to the device where IGMP snoop is enabled as multicast router port by

configuration definition.
When more than 2 multicast routers are connected set the multicast router port by configuration

definition.
When multicast router port is not recognized correctly and Terminal where multicast router is connected in

the beginning may not be able to receive the multicast packet.
In this device, the group address which is registered once, does not delete the entry itself, even if the

listener terminal does not exist, and deletes only the information of output port.
When an unnecessary group address is registered, it can be deleted by the clear igmpsnoop group

command. Details are,
When the maximum number of multicast group address that can be registered exceeds, flooding is done

for all the excessive addresses in the same VLAN. Do not use the IGMP snoop function, when the group
addresses being handled exceed the maximum number that can be registered.
It cannot be used in the network where communication other than the IPv4 multicast (Example: IPv6

communication) is used.
Do not enable the IGMP snoop function.

In this device, lower rank 23 bits of IP address are recognized as same address as to 224.1.1.1, 225.1.1.1,

224.1.1.1 and 225.129.1.1.
Therefore, even when a different listener terminal matching these addresses exists, the packet of for both

addresses is forwarded.
The source address of IGMP snoop need not be set usually. Set only when there is a device which cannot

recognize the IGMP packet which has 0.0.0.0 as source address. Further, when multiple IGMP devices are
connected, do not set more than 2 source addresses of IGMP snoop in the same VLAN.
In the network wherein multicast router is not connected, set to 'do not disable' the Querier operation by

vlan igmpsnoop querier command.
The IGMP snoop function of VLAN ID belonging to IEEE802.1Q tunnel port changes to disable.

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