multicast-vlan send-query prune-source-port

Format

multicast-vlan send-query prune-source-port

undo multicast-vlan send-query prune-source-port

Parameters

None

Views

VLAN view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
l2mc	write

Usage Guidelines

Usage Scenario

When the multicast VLAN and the user VLAN are configured on the same interface, general query packets are forwarded back through the interface by default. The source MAC address of the packet is not changed during the forwarding process. Therefore, the upstream device learns the MAC address table of the interface as the source MAC address. If the upstream device has learned the source MAC address from another interface, MAC address flapping occurs on the upstream device. To prevent MAC address flapping, run the pruning command to prune the Query messages sent from the source interface.

Prerequisites

Before running this command, create a VLAN, enable IGMP snooping in the system and LAN views, and run the mulitcast-vlan enable command in the VLAN.

Precautions

Before you run this command, run the multicast-vlan enable command in the VLAN view.

Before deleting the configuration of the multicast-vlan enable command, delete the configuration of this command.

Example

# Configure VLAN 100 to perform pruning for the query messages sent by the source port.

<HUAWEI> system-view
[~HUAWEI] igmp-snooping enable
[*HUAWEI] vlan 200
[*HUAWEI-vlan200] vlan 100
[*HUAWEI-vlan100] igmp-snooping enable
[*HUAWEI-vlan100] multicast-vlan enable
[*HUAWEI-vlan100] multicast-vlan user-vlan 200
[*HUAWEI-vlan100] multicast-vlan send-query prune-source-port