Filter
Top Products
Multimedia Traffic Control with IP Multicast (IGMP)
IGMP Operating Features
groups, and triggers updates of this information. With IGMP enabled,
the Series 5300XL switches use data from the Querier to determine
whether to forward or block multicast traffic on specific ports. When
the switch has an IP address on a given VLAN, it automatically
operates as a Querier for that VLAN if it does not detect a multicast
router or another switch functioning as a Querier. For more informa-
tion, refer to
“Querier Operation” on page 12-20.
IGMP Operating Features
In the factory default configuration, IGMP is disabled. If multiple VLANs are
not configured, you must configure IGMP on the default VLAN
(DEFAULT_VLAN; VID = 1). If multiple VLANs are configured, you must
configure IGMP on a per-VLAN basis for each VLAN in which you want IGMP
to operate’. When you use either the CLI 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 (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.
• Forward: Causes the switch to forward all IGMP and IP multicast
transmissions through 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.
12-4