6-36
Configuring the Switch
IP Multicast (IGMP) Service Features—Multimedia Traffic Control
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.
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.).
Parameter Description
Sraswb.book : SIER_SW6.FM Page 36 Tuesday, June 30, 1998 12:20 PM
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