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Chapter 4
Configuration Using the Web-based Utility
29
Business Series Smart Gigabit Ethernet Switch
Multicast
Multicast configuration options include IGMP Snooping,
Bridge Multicast, and Bridge Multicast Forward All.
Multicast > IGMP Snooping
Multicast > IGMP Snooping
When IGMP Snooping is enabled globally, all IGMP packets
are forwarded to the CPU. The CPU analyzes the incoming
packets and determines:
Which ports want to join which Multicast groups
Which ports have Multicast routers generating IGMP
queries
Which routing protocols are forwarding packets and
Multicast traffic
Ports requesting to join a specific Multicast group issue an
IGMP report, specifying that Multicast group is accepting
members. This results in the creation of the Multicast
filtering database.
The Bridge Multicast Forward All screen contains two
sections, IGMP Global and VLAN IGMP Settings. These
sections and the fields they contain are described below.
IGMP Global
Enable IGMP Snooping Select this option to enable
IGMP Snooping on the device. IGMP Snooping can be
enabled only if Bridge Multicast Filtering is enabled. The
default is disabled (option not selected).
VLAN IGMP Settings
VLAN ID Select the VLAN ID from the drop-down menu.
IGMP Status Select this option to enable IGMP snooping
on the VLAN. Default is disabled (option not selected).
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Auto Learn Select this option to enable Auto Learn on the
device. If Auto Learn is enabled, the device automatically
learns where other Multicast groups are located. The
default is enabled (option is selected).
Host Timeout Indicates the amount of time host waits to
receive a message before timing out. The default time is
260 seconds.
MRouter Timeout Indicates the amount of the time the
Multicast router waits to receive a message before it times
out. The default value is 300 seconds.
Leave Timeout Indicates the amount of time the host
waits, after requesting to leave the IGMP group and not
receiving a Join message from another station, before
timing out. If a Leave Timeout occurs, the switch notifies
the Multicast device to stop sending traffic The Leave
Timeout value is either user-defined, or an immediate
leave value. The default timeout is 10 seconds.
Click Update to update the screen with your changes.
Click Save Settings to save the changes, or Cancel
Changes to cancel the changes.
Multicast > Bridge Multicast
The Bridge Multicast screen displays the ports and LAGs
attached to the Multicast service group in the Ports and
LAGs tables. The Port and LAG tables also reflect the
manner in which the port or LAGs joined the Multicast
group.
Multicast > Bridge Multicast
Ports can be added either to existing groups or to new
Multicast service groups. The Bridge Multicast screen
permits new Multicast service groups to be created. The
Bridge Multicast screen also assigns ports to a specific
Multicast service address group.
The Bridge Multicast screen contains the following fields:
VLAN ID Identifies a VLAN to be configured to a Multicast
service.