Omron SYSMAC CJ1W-EIP21 - Manual (Page 306)

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Adjusting the Communications Load Section 10-2
The Usage of Capacity values also indicate that the Usage of Capacity has
increased (from 39.67% to 43.00%) for all of the other devices, which connect
with devices 192.168.250.1 and 192.168.250.10.
In this case, if there is no multicast filter, the value becomes 106.33%. If there
is no multicast filter for a switching hub, communications errors may occur
depending on the communications load of the EtherNet/IP Unit or built-in Eth-
erNet/IP Unit port.