Configuring igmp snooping querier, Configuration prerequisites, Enabling igmp snooping querier – H3C Technologies H3C S5120 Series Switches User Manual
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Configuring fast leave processing on a port or a group of ports
Follow these steps to configure fast leave processing on a port or a group of ports:
To do...
Use the command...
Remarks
Enter system view
system-view
—
interface interface-type interface-number
Enter Ethernet
interface/Layer 2 aggregate
interface view or port group
view
port-group manual port-group-name
Required
Use either approach
Enable fast leave processing igmp-snooping fast-leave [ vlan vlan-list ]
Required
Disabled by default
Configuring IGMP Snooping Querier
Configuration Prerequisites
Before configuring IGMP snooping querier, complete the following task:
z
Enable IGMP snooping in the VLAN.
Before configuring IGMP snooping querier, prepare the following data:
z
IGMP general query interval,
z
IGMP last-member query interval,
z
Maximum response time to IGMP general queries,
z
Source address of IGMP general queries, and
z
Source address of IGMP group-specific queries.
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 an 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:
To do...
Use the command...
Remarks
Enter system view
system-view
—
Enter VLAN view
vlan vlan-id
—
Enable IGMP snooping querier
igmp-snooping querier
Required
Disabled by default