Planet Technology MGSW-004 - Manual (Page 25)

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IF this function of a port is enabled, then the most significant 6 bits of the TOS (these 6 bits are
also known as the DiffServ Code Point "DSCP" field, value from 0 to 63) are used to assign a
priority to the packet received from this port. Please check the corresponding mapping
checkbox to assign a high priority or uncheck that to assign a low priority.
4.12 IGMP
IGMP is used in multicast communication network applications where one or more servers, for
example, video servers, generate multicast traffic. If you want your switch to support
multimedia and IP multicast, enable this option (default is enabled). When this option is
enabled, this switch only directs the multicast data packets to the ports where needed, saving
bandwidth. If "Forward with high priority" option is enabled, then the IP multicast traffic will
have a higher priority than other traffic.