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To do... Use the command... Remarks
Enable IGMP Snooping
querier
igmp-snooping querier
Required
By default, IGMP Snooping
querier is disabled.
Configuring IGMP query interval
Follow these steps to configure IGMP query interval:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter VLAN view
vlan vlan-id
—
Configure the IGMP query
interval
igmp-snooping query-interval
seconds
Optional
60 seconds by default.
Configuring the source address to be carried in IGMP queries
Follow these steps to configure the source address to be carried in IGMP queries:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter VLAN view
vlan vlan-id
—
Configure the source IP
address of IGMP general
queries
igmp-snooping general-query
source-ip { current-interface |
ip-address }
Optional
0.0.0.0 by default
Configure the source IP
address of IGMP
group-specific queries
igmp-snooping special-query
source-ip { current-interface |
ip-address }
0.0.0.0 by default
Suppressing Flooding of Unknown Multicast Traffic in a VLAN
With IGMP Snooping enabled in a VLAN, multicast traffic for unknown multicast groups is flooded within
the VLAN by default. This wastes network bandwidth and affects multicast forwarding efficiency.
With the unknown multicast flooding suppression function enabled, when receiving a multicast packet
for an unknown multicast group, an IGMP Snooping switch creates a nonflooding entry and relays the
packet to router ports only, instead of flooding the packet within the VLAN. If the switch has no router
ports, it drops the multicast packet.
Follow these steps to suppress flooding of unknown multicast traffic in the VLAN:
To do... Use the command... Remarks
Enter system view
system-view
—
Enable unknown
multicast flooding
suppression
igmp-snooping
nonflooding-enable
Required
By default, unknown multicast flooding
suppression
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