H3C S5120-EI Series User Manual

1-11
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 port/Layer 2
aggregate port 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
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.
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 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.

H3C S5120-EI Series Specifications

General

Brand	H3C
Model	S5120-EI Series
Category	Switch
Language	English