A10E/A28E/A28F Configuration Guide
When MVR is enabled, IGMP packet suppression can be enabled or disabled
respectively.
IGMP Querier
If a Layer 2 device is enabled with this function, it can actively send IGMP query packets to
query information about multicast members on the interface. If it is disabled with this function,
it only forwards IGMP query packets from routers.
When IGMP Snooping is enabled, IGMP Querier can be enabled or disabled
respectively.
Source IP address of query packets sent by IGMP Querier
IGMP querier sends the source IP address of query packets. By default, the IP address of IP
interface 0 is used. If the IP address is not configured, 0.0.0.0 is used. When receiving query
packets with IP address of 0.0.0.0, some hosts take it illegal and do not respond. Thus,
specifying the IP address for the query packet is recommended.
Query interval
It is the query interval for common groups. The query message of common group is
periodically sent by the Layer 2 device in multicast mode to all hosts in the shared network
segment, to query which multicast groups have members.
Maximum response time for query packets
The maximum response time for query packets is used to control the deadline for reporting
member relations by a host. When the host receives query packets, it starts a timer for each
added multicast group. The value of the timer is between 0 and maximum response time.
When the timer expires, the host sends the Report packet to the multicast group.
Interval for last member to send query packets
It is also called the specified group query interval. It is the interval for the Layer 2 device
continues to send query packets for the specified group when receiving IGMP Leave packet
for a specified group by a host.
The query packet for the specified multicast group is sent to query whether the group has
members on the interface. If yes, the members must send Report packets within the maximum
response time; after the Layer 2 device receives Report packets in a specie period, it continues
to maintain multicast forwarding entries of the group; If the members fail to send Report
packets within the maximum response time, the switch judges that the last member of the
multicast group has left and thus deletes multicast forwarding entries.
5.1.5 IGMP filtering
To control user access, you can set IGMP filtering. IGMP filtering contains the range of
accessible multicast groups passing filtering rules and the maximum number of groups.
IGMP filtering rules
To ensure information security, the administrator needs to limit the multicast users, such as
what multicast data are allowed to receive and what are not.
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