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◆
Snooping Enabled
– When enabled, the switch will monitor network traffic to determine
which hosts want to receive multicast traffic. (Default: Enabled)
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.
◆
Unregistered IPMC Flooding Enabled
– Floods unregistered multicast traffic into the
attached VLAN. (Default: Disabled)
Once the table used to store multicast entries for IGMP snooping is filled, no new entries
are learned. If no router port is configured in the attached VLAN, and Unregistered IPMC
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)
IGMP leave proxy suppresses all unnecessary IGMP leave messages so that a non-querier
switch forwards an IGMP 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,
the receiving port is not a router port, and no IGMPv1 member port exists in the group, 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.
Leave proxy is also included in the general proxy function described below. Therefore if
Leave Proxy Enabled is not selected, but Proxy Enabled is selected, leave proxy will still be
performed.
◆
Proxy Enabled
– Enables IGMP Snooping with Proxy Reporting. (Default: Disabled)
When proxy reporting is enabled with this command, the switch performs “IGMP Snooping
with Proxy Repor
ting” (as defined in DSL Forum TR-101, April 2006), including report
suppression, last leave, and query suppression.
Report suppression intercepts, absorbs and summarizes IGMP reports coming from
downstream hosts. Last leave sends out a proxy query when the last member leaves a
multicast group, and query suppression means that neither specific queries nor general
queries are forwarded from an upstream multicast router to hosts downstream from this
device.
When proxy reporting is disabled, all IGMP reports received by the switch are forwarded
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