Configuring Igmp Snooping Querier; Configuration Prerequisites; Enabling Igmp Snooping Querier - 3Com 4500G Family Configuration Manual

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...
Enter system view
Enter Ethernet port/Layer 2
aggregate port view or port
group view
Enable fast leave processing

Configuring IGMP Snooping Querier

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.

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:
To do...
Enter system view
Enter VLAN view
Enable IGMP Snooping querier
Use the command...
system-view
interface interface-type interface-number
port-group manual port-group-name
igmp-snooping fast-leave [ vlan vlan-list ]
Use the command...
system-view
vlan vlan-id
igmp-snooping querier
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Remarks
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Required
Use either approach
Required
Disabled by default
Remarks
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—
Required
Disabled by default