loop-detect identifier

Function

The loop-detect identifier command configures an authentication identifier for L2VPN loop detection on an interface.

The undo loop-detect identifier command deletes the configured authentication identifier for L2VPN loop detection on an interface.

By default, no authentication identifier for L2VPN loop detection is configured on an interface.

Format

loop-detect identifier identifier-value

undo loop-detect identifier [ identifier-value ]

Parameters

Parameter	Description	Value
identifier-value	Specifies an authentication identifier.	The name is a string of 1 to 16 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string.

Parameter

Description

Value

identifier-value

Specifies an authentication identifier.

The name is a string of 1 to 16 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string.

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

L2VPN loop detection detects whether a loop exists between the AC interfaces of two PEs on a VPLS or VLL network when a CE is dual-homed to the PEs. To prevent an AC interface from being unexpectedly blocked, run the loop-detect identifier command on the two PEs to configure the same authentication identifier. After a PE receives a detection packet, it checks whether the identifier in the packet is the same as its local one. The PE considers the packet valid only when the identifiers are the same.

Prerequisites

L2VPN loop detection has been enabled globally and on an interface.

Precautions

The loop-detect identifier command takes effect only for L2VPN loop detection.

If an authentication identifier for L2VPN loop detection is configured in both the interface view and global view, the configuration in the interface view is preferentially used.

After an authentication identifier is configured on the local device, if the identifier in the detection packet received from a peer device is different from the local one, the local device discards the packet.

Example

# Configure abc as the authentication identifier for L2VPN loop detection in loose mode on the interface GE 0/1/0.1.

<HUAWEI> system-view
[~HUAWEI] loop-detection enable
[~HUAWEI] interface GigabitEthernet0/1/0.1
[~HUAWEI-GigabitEthernet0/1/0.1] loop-detect enable
[*HUAWEI-GigabitEthernet0/1/0.1] loop-detect identifier abc