igmp-snooping proxy

Function

The igmp-snooping proxy command enables IGMP Snooping Proxy in a VLAN.

The igmp-snooping proxy querier-disable command disables the querier function of IGMP Snooping Proxy in a VLAN or VSI.

The undo igmp-snooping proxy command disables IGMP Snooping Proxy in a VLAN.

By default, IGMP Snooping Proxy in a VLAN is disabled.

Format

igmp-snooping proxy

undo igmp-snooping proxy

Parameters

None

Views

VLAN view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
l2mc	write

Usage Guidelines

Usage Scenario

Forwarding entries are set up based on IGMP messages exchanged between a Layer 3 device and user hosts. If there are many user hosts, redundant IGMP messages increase the workload of the Layer 2 device.

IGMP Snooping Proxy can address this problem. IGMP Snooping Proxy provides two functions: querier function and uniform Report/Leave message transmission function. The querier function enables an IGMP Snooping Proxy-enabled device to replace the connected upstream device to send IGMP Query messages. The uniform Report/Leave message transmission function enables an IGMP Snooping Proxy-enabled device to process IGMP Report/Leave messages received from downstream user hosts. Configuring IGMP Snooping Proxy on a device effectively saves bandwidth between the device and the connected upstream device, and reduces the load of the connected upstream device.

Configuration Impact

After IGMP Snooping Proxy is enabled on a device, Report messages sent by users will be terminated on the device.

Precautions

The following conditions must be met before the igmp-snooping proxy command is run:

The querier function is configured on a device only after a static multicast group is configured on the connected upstream device. Otherwise, Report messages sent by user hosts cannot be forwarded to the upstream device. As a result, these user hosts cannot receive required multicast data.
If the paths from a multicast source to user hosts are in the same Layer 2 network, the querier function can be enabled on a Layer 2 device. This does not affect the normal receiving of multicast data packets.
The querier function fails to be run in the VLAN view in any of the following situations:
A Dot1q termination sub-interface has been added to the VLAN.
The VLAN has been bound to a VSI.
The querier function has been configured on the VLAN.
The igmp-snooping report-suppress command is used to configure IGMP Report message suppression in a VLAN.
The pim sm command is used to configure PIM-SM on a VLANIF interface in a VLAN.

Example

# Enable IGMP Snooping Proxy in VLAN 10.

<HUAWEI> system-view
[~HUAWEI] igmp-snooping enable
[*HUAWEI] vlan 10
[*HUAWEI-vlan10] igmp-snooping proxy