Supermicro SSE-G2252 User Manual page 481

NOTE: When the switch is configured to use IGMPv3 snooping, the snooping
version may be downgraded to version 2 or version 1, depending on the version
of the IGMP query packets detected on each VLAN.
NOTE: IGMP snooping will not function unless a multicast router port is enabled
on the switch. This can accomplished in one of two ways. A static router port
can be manually configured (see
Router" on page
and will continue to function until explicitly removed. The other method relies on
the switch to dynamically create multicast routing ports whenever multicast
routing protocol packets or IGMP query packets are detected on a port.
NOTE: A maximum of up to 255 multicast entries can be maintained for IGMP
snooping. Once the table is full, no new entries are learned. Any subsequent
multicast traffic not found in the table is dropped if unregistered-flooding is
disabled (default behavior) and no router port is configured in the attached
VLAN, or flooded throughout the VLAN if unregistered-flooding is enabled (see
"Configuring IGMP Snooping and Query Parameters" on page
Static IGMP Router Interface – If IGMP snooping cannot locate the IGMP querier, you
can manually designate a known IGMP querier (i.e., a multicast router/switch)
connected over the network to an interface on your switch
for a Multicast Router" on page
multicast groups supported by the attached router/switch to ensure that multicast traffic
is passed to all appropriate interfaces within the switch.
Static 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 ("Assigning Interfaces to Multicast Services" on page
IGMP Snooping with Proxy Reporting – The switch supports last leave, and query
suppression (as defined in DSL Forum TR-101, April 2006):
• When proxy reporting is disabled, all IGMP reports received by the switch are
forwarded natively to the upstream multicast routers.
• Last Leave: Intercepts, absorbs and summarizes IGMP leaves coming from IGMP
hosts. IGMP leaves are relayed upstream only when necessary, that is, when the
last user leaves a multicast group.
• Query Suppression: Intercepts and processes IGMP queries in such a way that
IGMP specific queries are never sent to client ports.
The only deviation from TR-101 is that the marking of IGMP traffic initiated by the switch
with priority bits as defined in R-250 is not supported.
"Specifying Static Interfaces for a Multicast
18-8). Using this method, the router port is never timed out,
18-8). This interface will then join all the current
18-3
Chapter 18: Multicast Filtering
18-4).
("Specifying Static Interfaces
18-10).