Asus GigaX2024SX - Manual (Page 162)

switches in your network, you can use IGMP Snooping and Query (page 3-134) to
monitor IGMP service requests passing between multicast clients and servers,
mically configure the switch ports which need to forward multicast traffic.
S uerier,
yo a multicast router/switch)
co age 3-137). This
in rted by the attached
sure that multicast traffic is passed to all appropriate interfaces
tatic IGMP Host Interface – For multicast applications that you need to control
more carefully, you can manually assign a multicast service to specific interfaces
on the switch (page 3-138).
Configuring IGMP Snooping and Query Parameters
You can configure the switch to forward multicast traffic intelligently. Based on the
IGMP query and report messages, the switch forwards traffic only to the ports that
request multicast traffic. This prevents the switch from broadcasting the traffic to
all ports and possibly disrupting network performance.
Command Usage
• IGMP Snooping – This switch can passively snoop on IGMP Query and Report
packets transferred between IP multicast routers/switches and IP multicast host
groups to identify the IP multicast group members. It simply monitors the IGMP
packets passing through it, picks out the group registration information, and
configures the multicast filters accordingly.
• IGMP Querier – A router, or multicast-enabled switch, can periodically ask their
hosts if they want to receive multicast traffic. If there is more than one
router/switch on the LAN performing IP multicasting, one of these devices is
elected “querier” and assumes the role of querying the LAN for group members. It
then propagates the service requests on to any upstream multicast switch/router
to ensure that it will continue to receive the multicast service.
Note: Multicast routers use this information, along with a multicast routing
protocol such as DVMRP or PIM, to support IP multicasting across the Internet.
Command Attributes
• IGMP Status — When enabled, the switch will monitor network traffic to
determine which hosts want to receive multicast traffic. This is also referred to as
IGMP Snooping. (Default: Enabled)
• Act as IGMP Querier — When enabled, the switch can serve as the Querier,
which is responsible for asking hosts if they want to receive multicast traffic.
(Default: Enabled)
• IGMP Query Count — Sets the maximum number of queries issued for which
there has been no response before the switch takes action to drop a client from
the multicast group. (Range: 2-10, Default: 2)
• IGMP Query Interval — Sets the frequency at which the switch sends IGMP
host-query messages. (Range: 60-125 seconds, Default: 125)
and dyna
tatic IGMP Router Interface – If IGMP snooping cannot locate the IGMP q
u can manually designate a known IGMP querier (i.e.,
nnected over the network to an interface on your switch (p
terface will then join all the current multicast groups suppo
router/switch to en
within the switch.
S
3-137