Configuring the Switch

IP Multicast (IGMP) Service Features—Multimedia Traffic Control

Parameter Description

Further Options

Available in the

Switch Console

By using the switch console, you can make these further changes to IGMP operation:

•On a per-port basis, block or forward all IP multicast traffic.

•For all ports on the switch, forward IP multicast traffic at high priority. (The default is for the switch to process IGMP traffic, along with other traffic, in the order received.)

•Change the querier configuration setting. (By default, the switch will act as a querier if a multicast router is not present to perform this function.)

For more information, refer to “Using the Switch Console to Configure IGMP” (page 6-36)and “How IGMP Operates” (page 6-38.).

Configuring the Switch

Using the Switch Console To Configure IGMP

In the factory default configuration, IGMP is disabled. When you use either the console or the web browser interface to enable IGMP on the switch, the switch forwards IGMP traffic only to ports belonging to multicast groups.

Using the console enables these additional options:

■Forward with High Priority. By default, this parameter is disabled, which causes the switch to process IP multicast traffic, along with other traffic, in the order received. If priority forwarding is supported by the network technology you are using, enabling this parameter causes the switch 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 6-38.

6-36