Configuring Igmp Snooping Querier; Enabling Igmp Snooping Querier - H3C S7500E Series Operation Manual

Operation Manual – Multicast
H3C S7500E Series Ethernet Switches
Caution:
If fast leave processing is enabled on a port to which more than one host is attached,
when one host leaves a multicast group, the other hosts attached to the port and
interested in the same multicast group will fail to receive multicast data for that group.

2.5 Configuring IGMP Snooping Querier

2.5.1 Configuration Prerequisites
Before configuring IGMP Snooping querier, complete the following task:
Enable IGMP Snooping in the VLAN.
Before configuring IGMP Snooping querier, prepare the following data:
IGMP general query interval,
IGMP last-member query interval,
Maximum response time to IGMP general queries,
Source address of IGMP general queries, and
Source address of IGMP group-specific queries.

2.5.2 Enabling IGMP Snooping Querier

In an IP multicast network running IGMP, a multicast router or Layer 3 multicast switch
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.
However, a Layer 2 multicast switch does not support IGMP, and therefore cannot send
general queries by default. By enabling IGMP Snooping on a Layer 2 switch in a VLAN
where multicast traffic needs to be Layer-2 switched only and no multicast routers are
present, the Layer 2 switch will act as the IGMP Snooping querier to send IGMP
queries, thus allowing multicast forwarding entries to be established and maintained at
the data link layer.
Follow these steps to enable IGMP Snooping querier:
Enter system view
Enter VLAN view
Enable IGMP Snooping
querier
To do...
system-view
vlan vlan-id
igmp-snooping querier
Chapter 2 IGMP Snooping Configuration
Use the command...
2-14
Remarks
—
—
Required
Disabled by default