pim single-tag forward enable

Function

The pim single-tag forward enable command enables a QinQ/dot1q VLAN tag termination sub-interface to forward single-tagged PIM messages.

The undo pim single-tag forward enable command restores the default configuration.

By default, a QinQ/dot1q VLAN tag termination sub-interface is not enabled to forward single-tagged PIM messages.

Format

pim single-tag forward enable

undo pim single-tag forward enable

Parameters

None

Views

100ge sub-interface view, 10GE sub-interface view, 200GE sub-interface view, 25GE sub-interface view, 400GE sub-interface view, 40GE sub-interface view, 50GE sub-interface view, Eth-Trunk sub-interface view, GE sub-interface view, Global VE sub-interface view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
pim	write

Usage Guidelines

Usage Scenario

If a QinQ/dot1q VLAN tag termination sub-interface on the Router is connected to a downstream Router, run the pim single-tag forward enable command to enable the sub-interface to forward single-tagged PIM messages received from the downstream device.

Prerequisites

Multicast routing has been enabled using the multicast routing-enable command in the system view, and PIM-SM has been enabled on the sub-interface using the pim sm command.

Precautions

The pim single-tag forward enable command is mutually exclusive with the igmp enable and igmp static-group commands.

This command applies only to QinQ/dot1q VLAN tag termination sub-interfaces that are configured to terminate single-taggedPIM messages or are not configured to terminate any tagged PIM messages.

The pim single-tag forward enable command takes effect only when the QinQ/Dot1q termination sub-interface functions as the outbound interface.

After the undo pim single-tag forward enable command is run on a QinQ/dot1q VLAN tag termination sub-interface, QinQ/dot1q outbound interface entries of the sub-interface fail to be delivered to the sub-interface, causing multicast traffic forwarding failures.

Example

# Enable a QinQ/dot1q VLAN tag termination sub-interface to forward single-tagged PIM messages.

<HUAWEI> system-view
[~HUAWEI] multicast routing-enable
[*HUAWEI] interface GigabitEthernet 0/1/1.1
[*HUAWEI-GigabitEthernet0/1/1.1] encapsulation dot1q-termination
[*HUAWEI-GigabitEthernet0/1/1.1] dot1q termination vid 10
[*HUAWEI-GigabitEthernet0/1/1.1] pim single-tag forward enable