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Configuring the Switch
IP Multicast (IGMP) Features—Multimedia Traffic Control
Configuring the Switch
Configuring IGMP from the Switch Console
In the factory default configuration, IGMP is disabled. If multiple VLANs are
configured, you can configure IGMP on a per-VLAN basis. When you use either
the console or the web browser interface to enable IGMP on the switch or a
VLAN, the switch forwards IGMP traffic only to ports belonging to multicast
groups. Using the console enables these additional options:
■ Forward with High Priority. Disabling this parameter (the default)
causes the switch or VLAN to process IP multicast traffic, along with other
traffic, in the order received. Enabling this parameter causes the switch
or VLAN to give a higher priority to IP multicast traffic than to other traffic.
■ Auto/Blocked/Forward: You can use the console to configure individual
ports to any of the following states:
• Auto (the 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 to block all outgoing IP Multicast packets for
that port. This has the effect of preventing IGMP traffic from moving
through specific ports.
• Forward: Causes the switch to forward all IGMP and IP multicast
transmissions through the port.
For more information, refer to “How IGMP Operates” on page 6-100.
To Access IGMP Service:
Use this procedure to configure or edit the IGMP settings for a switch or VLAN.
1. From the Main Menu, select:
3. Switch Configuration
5. Advanced Features
3. IP Multicast (IGMP) Service