loop-detect detection vid

Function

The loop-detect detection vid command sets a VLAN range for a sub-interface for dot1q VLAN tag termination and its main interface to send loop detection packets.

The undo loop-detect detection vid command deletes the VLAN range specified for a sub-interface for dot1q VLAN tag termination and its main interface to send loop detection packets.

By default, a sub-interface for dot1q VLAN tag termination can send loop detection packets to all VLANs configured on the sub-interface, whereas its main interface sends only untagged VLAN packets and packets with the VLAN ID being 0.

Format

loop-detect detection vid low-vid [ to high-vid ]

undo loop-detect detection vid low-vid [ to high-vid ]

Parameters

Parameter	Description	Value
low-vid	Specifies the start VLAN ID carried in loop detection packets.	The value is an integer ranging from 1 to 4094.
to high-vid	Specifies the end VLAN ID carried in loop detection packets.	The value is an integer ranging from 1 to 4094. The value of high-vid must be greater than that of low-vid.

Parameter

Description

Value

low-vid

Specifies the start VLAN ID carried in loop detection packets.

The value is an integer ranging from 1 to 4094.

to high-vid

Specifies the end VLAN ID carried in loop detection packets.

The value is an integer ranging from 1 to 4094. The value of high-vid must be greater than that of low-vid.

Views

Eth-Trunk sub-interface view, Eth-Trunk interface view, GE sub-interface view, GE interface view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
vlan	write

Usage Guidelines

Usage Scenario

The loop-detect detection vid command can be run on a sub-interface for dot1q VLAN tag termination and its main interface only after loop detection is enabled globally and the loop-detect enable command is run on the VPLS AC interface.

The loop-detect detection vid command applies only to sub-interfaces for dot1q VLAN tag termination and its main interface. By default, a sub-interface for dot1q VLAN tag termination sends loop detection packets to all configured VLANs to detect intra-VLAN loops. This command allows you to specify the VLAN range to which a sub-interface for dot1q VLAN tag termination can send loop detection packets. By default, a main interface sends only untagged VLAN packets and packets with the VLAN ID being 0. After this command is run on a main interface, the interface sends loop detection packets with a specified VLAN range in addition to the untagged VLAN packets and packets with the VLAN ID being 0.

Example

# Configure GE 0/1/0 to send loop detection packets with VLAN IDs ranging from 3 to 100.

<HUAWEI> system-view
[~HUAWEI] loop-detection enable
[*HUAWEI] interface GigabitEthernet 0/1/0
[*HUAWEI-GigabitEthernet0/1/0] loop-detect enable
[*HUAWEI-GigabitEthernet0/1/0] loop-detect detection vid 3 to 100

# Configure sub-interface for dot1q VLAN tag termination GE 0/1/0.1 to send loop detection packets with VLAN IDs ranging from 3 to 100.

<HUAWEI> system-view
[~HUAWEI] loop-detection enable
[*HUAWEI] interface GigabitEthernet 0/1/0.1
[*HUAWEI-GigabitEthernet0/1/0.1] control-vid 3 dot1q-termination
[*HUAWEI-GigabitEthernet0/1/0.1] dot1q termination vid 1 to 100
[*HUAWEI-GigabitEthernet0/1/0.1] loop-detect enable
[*HUAWEI-GigabitEthernet0/1/0.1] loop-detect detection vid 3 to 100