H3C S5120-EI Series User Manual

1-13
Configuring IGMP queries and responses in a VLAN
Follow these steps to configure IGMP queries and responses in a VLAN:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter VLAN view
vlan vlan-id
—
Configure IGMP general query
interval
igmp-snooping query-interval
interval
Optional
60 seconds by default
Configure the maximum
response time to IGMP general
queries
igmp-snooping max-response-time
interval
Optional
10 seconds by default
Configure the IGMP
last-member query interval
igmp-snooping
last-member-query-interval interval
Optional
1 second by default
In the configuration, make sure that the IGMP general query interval is larger than the maximum
response time for IGMP general queries. Otherwise, multicast group members may be deleted by
mistake.
Configuring Source IP Address of IGMP Queries
Upon receiving an IGMP query whose source IP address is 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, you are commended to
configure a non-all-zero IP address as the source IP address of IGMP queries.
Follow these steps to configure source IP address of IGMP queries:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter VLAN view
vlan vlan-id
—
Configure the source 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 }
Optional
0.0.0.0 by default
The source address of IGMP query messages may affect IGMP querier selection within the segment.

H3C S5120-EI Series Specifications

General

Brand	H3C
Model	S5120-EI Series
Category	Switch
Language	English