LevelOne GEL-2670 User Manual page 158

| Configuring the Switch
C 4
HAPTER
MLD Snooping
P
ARAMETERS
These parameters are displayed:
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
router port, the switch will generate and send a group-specific (GS)
query to the member port which received the leave message, and then
start the last member query timer for that port.
When the conditions in the preceding item all apply, except that the
receiving port is a router port, then the switch will not send a GS-query,
but will immediately start the last member query timer for that port.
Proxy Enabled - Configures the switch to issue MLD host report
◆
messages on behalf of hosts discovered through standard MLD
interfaces. (Default: Disabled)
When MLD proxy is enabled, the switch exchanges MLD messages with
the router on its upstream interface, and performs the host portion of
the MLD task on the upstream interface as follows:
When queried, it sends multicast listener reports to the group.
■
When a host joins a multicast group to which no other host belongs,
■
it sends unsolicited multicast listener reports to that group.
When the last host in a particular multicast group leaves, it sends
■
an unsolicited multicast listener done report to the all-routers
address (FF02::2) for MLDv1.
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