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Multimedia Traffic Control with IP Multicast (IGMP)

IGMP General Operation and Features

IGMP Operating Features

Basic Operation

In the factory default configuration, IGMP is disabled. To enable IGMP

■ If multiple VLANs are not configured, you configure IGMP on the default

VLAN (DEFAULT_VLAN; VID = 1).

■ If multiple VLANs are configured, you configure IGMP on a per-VLAN

basis for every VLAN where this feature is to be used.

Enhancements

With the CLI, you can configure these additional options:

■ Forward with High Priority. Disabling this parameter (the default)

causes the switch or VLAN to process IP multicast traffic, along with ot her

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.

■ 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.

■ Operation With or Without IP Addressing: This feature helps to

conserve IP a ddresses by en abling IGMP to run on VLA Ns that do not have

an IP address. See “Operation With or Without IP Addressing” on page

2-13.

■ Querier Capability: The switch performs this function for IGMP on

VLANs having an IP address when there is no other device in the VLAN

acting as querier. See “Using the Switch as Querier” on page 2-26.

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ProCurve 2900 Betriebsanweisung Seite 29