Options

Disabling this parameter (the default) causes the switch or VLAN to process IP multicast traffic, along with other traffic, in the order received (usually, normal priority.) Enabling this parameter causes the switch or VLAN to give a higher priority to IP multicast traffic than to other traffic.

You can use the console to configure individual ports to any of the following states:

Auto

(Default) Causes the switch to interpret IGMP packets and to filter IP multicast traffic based on the IGMP packet information for ports belonging to a multicast group. This means that IGMP traffic will be forwarded on a specific port only if an IGMP host or multicast router is connected to the port.

Blocked

Causes the switch to drop all IGMP transmissions received from a specific port, and also blocks all outgoing IP Multicast packets for that port, thus preventing IGMP traffic from moving through specific ports.

Forward

Causes the switch to forward all IGMP and multicast transmissions through the port.

This feature helps to conserve IP addresses by enabling IGMP to run on VLANs that do not have an IP address. See Operation with or without IP addressing.

The switch performs querier function for IGMP on VLANs having an IP address when there is no other device in the VLAN acting as querier. See About using the switch as querier.