mpls l2vpn vccv bfd-cv-negotiation

Function

The mpls l2vpn vccv bfd-cv-negotiation command sets the BFD CV Type value in the VCCV field.

The undo mpls l2vpn vccv bfd-cv-negotiation command restores the BFD CV Type value in the VCCV field.

By default, the BFD CV Type value in the VCCV field is 0x08.

Format

mpls l2vpn vccv bfd-cv-negotiation { fault-detection-only | ach-fault-detection-only }

undo mpls l2vpn vccv bfd-cv-negotiation [ fault-detection-only | ach-fault-detection-only ]

Parameters

Parameter	Description	Value
fault-detection-only	Specifies the BFD CV Type as 0x04.	-
ach-fault-detection-only	Specifies the BFD CV Type as 0x10.	-

Parameter

Description

Value

fault-detection-only

Specifies the BFD CV Type as 0x04.

ach-fault-detection-only

Specifies the BFD CV Type as 0x10.

Views

MPLS-L2VPN view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
l2vpn	write

Usage Guidelines

Usage Scenario

VCCV is a mechanism to detect and diagnose end-to-end faults on PWs. VCCV is, in its simplest description, a control channel between a PW's ingress and egress over which connectivity verification messages can be sent. A Label Mapping packet uses the BFD CV Type field to indicate whether a PW supports BFD fault detection. The BFD CV Type can be 0x04, 0x08, or 0x10. By default, the BFD CV Type is 0x08.

0x04: supports BFD IP/UDP encapsulation, used in PW fault detection only. The keyword is fault-detection-only.
0x08: supports BFD IP/UDP encapsulation, used for PW fault detection and AC/PW status signaling.
0x10: supports BFD PW-ACH encapsulation, used for PW fault detection only. The keyword is ach-fault-detection-only.

You can run the mpls l2vpn vccv bfd-cv-negotiation command globally to control the BFD CV value sent to the remote peer.

The mpls l2vpn vccv bfd-cv-negotiation fault-detection-only command sets the BFD CV value to be sent to all remote peers to 0x04.
The mpls l2vpn vccv bfd-cv-negotiation ach-fault-detection-only command sets the BFD CV value to be sent to all remote peers to 0x10.
The undo mpls l2vpn vccv bfd-cv-negotiation [fault-detection-only | ach-fault-detection-only] command sets the BFD CV value to be sent to all remote peers to 0x08.

Configuration Impact

If the BFD CV Type used during the negotiation of a PW changes after the mpls l2vpn vccv bfd-cv-negotiation command is configured, the PW will be re-established, and services will be temporarily interrupted.

Precautions

The mpls l2vpn vccv bfd-cv-negotiation command applies to LDP VPLS PWs and LDP VPWS SS-PWs.
If the global BFD CV Type is different from the BFD CV Type specified for a remote peer, the BFD CV Type specified for the remote peer prevails.
When a Huawei device interconnects with a non-Huawei device, BFD CV must be set to 0x04 or 0x10.

Example

# Specify the BFD CV Type as 0x10 for Label Mapping packets to be sent to all remote peers.

<HUAWEI> system-view
[~HUAWEI] mpls
[*HUAWEI-mpls] quit
[*HUAWEI] mpls l2vpn
[*HUAWEI-l2vpn] mpls l2vpn vccv bfd-cv-negotiation ach-fault-detection-only

# Specify the BFD CV Type as 0x04 for Label Mapping packets to be sent to all remote peers.

<HUAWEI> system-view
[~HUAWEI] mpls
[*HUAWEI-mpls] quit
[*HUAWEI] mpls l2vpn
[*HUAWEI-l2vpn] mpls l2vpn vccv bfd-cv-negotiation fault-detection-only