igmp-snooping send-router-alert

Function

The igmp-snooping send-router-alert command configures a device to send IGMP messages that contain the Router-Alert option in the IP header to a VLAN.

The undo igmp-snooping send-router-alert command configures a device to send IGMP messages that do not contain the Router-Alert option in the IP header to a VLAN.

By default, a device sends IGMP messages that contain the Router-Alert option in the IP header to a VLAN.

Format

igmp-snooping send-router-alert

undo igmp-snooping send-router-alert

Parameters

None

Views

VLAN view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
l2mc	write

Usage Guidelines

Usage Scenario

Router-Alert is a mechanism used to identify protocol packets. Packets carrying Router-Alert options are delivered to the routing protocol layer for processing.

By default, devices do not check whether packets carry Router-Alert options for the sake of compatibility, and send all IGMP messages to the upper layer for processing. To improve device performance, reduce costs, and ensure protocol security, configure devices to send packets without Router-Alert options.

Precautions

The igmp-snooping send-router-alert command fails to be run in the VLAN view when a Dot1q termination sub-interface has been added to the VLAN.

Example

# Configure a device to send IGMP messages that do not contain the Router-Alert option in the IP header to VLAN 2.

<HUAWEI> system-view
[~HUAWEI] igmp-snooping enable
[*HUAWEI] vlan 2
[*HUAWEI-vlan2] undo igmp-snooping send-router-alert