igmp-snooping (VLAN view)

Function

The igmp-snooping command sets a multicast group model in a VLAN.

The undo igmp-snooping command restores the default configuration.

By default, the multicast group model is ASM-SSM and both ASM and SSM packets are supported in a VLAN.

Format

igmp-snooping { ssm-only | asm-only | asm-ssm }

undo igmp-snooping { ssm-only | asm-only }

Parameters

Parameter	Description	Value
ssm-only	Indicates that entries with the group address type of SSM are learned.	-
asm-only	Indicates that entries with the group address type of ASM are learned.	-
asm-ssm	Indicates that entries with the group address type of ASM or SSM are learned.	-

Parameter

Description

Value

ssm-only

Indicates that entries with the group address type of SSM are learned.

asm-only

Indicates that entries with the group address type of ASM are learned.

asm-ssm

Indicates that entries with the group address type of ASM or SSM are learned.

Views

VLAN view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
l2mc	write

Usage Guidelines

Usage Scenario

There are two multicast group models: any-source multicast (ASM) and source-specific multicast (SSM). The igmp-snooping command can be used to configure a device to forward data only for multicast groups of the ASM or SSM model in a VLAN.

Prerequisites

The igmp-snooping enable command has been run to enable IGMP snooping globally and in a VLAN.

Configuration Impact

If asm-only is specified in the igmp-snooping command, only (*, G) messages are processed, and other packets are discarded.

Example

# Set the multicast group model to ASM-only in VLAN 2.

<HUAWEI> system-view
[~HUAWEI] igmp-snooping enable
[*HUAWEI] vlan 2
[*HUAWEI-vlan2] igmp-snooping enable
[*HUAWEI-vlan2] igmp-snooping asm-only