H3C Technologies H3C S3600 Series Switches - Manual (Page 459)

6-10
Configuring IGMP Snooping Querier
In an IP multicast network running IGMP, a multicast router is responsible for sending IGMP general
queries, so that all Layer 3 multicast devices can establish and maintain multicast forwarding entries,
thus to forward multicast traffic correctly at the network layer. This router or Layer 3 switch is called
IGMP querier.
Upon receiving an IGMP query with the source IP address 0.0.0.0 on a port, the switch does not enlist
that port as a dynamic router port. This may prevent multicast forwarding entries from being correctly
created at the data link layer and cause multicast traffic forwarding failure in the end. When a Layer 2
device acts as an IGMP-Snooping querier, to avoid the aforesaid problem, configure a non-all-zero IP
address as the source IP address of IGMP queries.
IGMP Snooping querier related configurations include:
z Enabling IGMP Snooping querier,
z Configuring the IGMP query interval, and
z Configuring the source address to be carried in IGMP general and group specific queries..
Enabling IGMP Snooping querier
Follow these steps to enable IGMP Snooping querier:
To do... Use the command... Remarks
Enter system view system-view —
Enable IGMP Snooping igmp-snooping enable
Required
By default, IGMP Snooping is
disabled.
Enter VLAN view vlan vlan-id —
Enable IGMP Snooping igmp-snooping enable
Required
By default, IGMP Snooping is
disabled.
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: