C
HAPTER
4
| Configuring the Switch
MLD Snooping
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CONFIGURING GLOBAL
AND PORT-RELATED
SETTINGS FOR MLD
SNOOPING
Use the MLD Snooping Configuration page to configure global and port-
related settings which control the forwarding of multicast traffic. Based on
the MLD 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.
If multicast routing is not supported on other switches in your network, you
can use MLD Snooping and Query to monitor MLD service requests passing
between multicast clients and servers, and dynamically configure the
switch ports which need to forward multicast traffic.
Multicast routers use information from MLD snooping and query reports,
along with a multicast routing protocol such as PIMv6, to support IP
multicasting across the Internet.
CLI REFERENCES
◆ "MLD Snooping Commands" on page 497
PARAMETERS
The following parameters are displayed on the MLD Snooping Configuration
page:
Global Configuration
◆ Snooping Enabled - When enabled, the switch will monitor network
traffic to determine which hosts want to receive multicast traffic.
(Default: Disabled)
This switch can passively snoop on MLD Listener 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 MLD control packets passing through it, picks out
the group registration information, and configures the multicast filters
accordingly.
◆ Unregistered IPMCv6 Flooding Enabled - Floods unregistered
multicast traffic into the attached VLAN. (Default: Enabled)
Once the table used to store multicast entries for MLD snooping is
filled, no new entries are learned. If no router port is configured in the
attached VLAN, and Unregistered IPMCv6 Flooding is disabled, any
subsequent multicast traffic not found in the table is dropped,
otherwise it is flooded throughout the VLAN.
◆ Leave Proxy Enabled - Suppresses leave messages unless received
from the last member port in the group. (Default: Disabled)
MLD leave proxy suppresses all unnecessary MLD leave messages so
that a non-querier switch forwards an MLD leave packet only when the
last dynamic member port leaves a multicast group.
The leave-proxy feature does not function when a switch is set as the
querier. When the switch is a non-querier, the receiving port is not the
last dynamic member port in the group, and the receiving port is not a
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