mpls l2vpn vccv bfd-cv-negotiation peer

Function

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

The undo mpls l2vpn vccv bfd-cv-negotiation peer 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 peer peer-address { enable | disable }

mpls l2vpn vccv bfd-cv-negotiation { ach-fault-detection-only | detection-and-signaling } peer peer-address enable

undo mpls l2vpn vccv bfd-cv-negotiation { fault-detection-only | ach-fault-detection-only | detection-and-signaling } peer peer-address

Parameters

Parameter	Description	Value
enable	Enables the function to send the BFD CV Type information to the remote peer.	-
disable	Restores the default BFD CV Type in the VCCV field.	-
ach-fault-detection-only	Specifies the BFD CV Type as 0x10.	-
detection-and-signaling	Specifies the BFD CV Type as 0x08.	-
peer peer-address	Specifies the IP address of a remote peer.	This value is in dotted decimal notation.
fault-detection-only	Specifies the BFD CV Type as 0x04.	-

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. If a remote peer does not support the 0x08 BFD CV Type, run the mpls l2vpn vccv bfd-cv-negotiation command to change the BFD CV Type in the Label Mapping packet.

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. The keyword is detection-and-signaling.
0x10: supports BFD PW-ACH encapsulation, used for PW fault detection only. The keyword is ach-fault-detection-only.
To set the value of the BFD CV Type field to be sent to remote peers, run the mpls l2vpn vccv bfd-cv-negotiation command. Note that:
Peer-based configuration:
The mpls l2vpn vccv bfd-cv-negotiation fault-detection-only peer <peer-address> enable command sets the BFD CV Type to 0x04 for Label Mapping packets to be sent to a specified remote peer.
The mpls l2vpn vccv bfd-cv-negotiation detection-and-signaling peer <peer-address> enable command sets the BFD CV Type to 0x08 for Label Mapping packets to be sent to a specified remote peer.
The mpls l2vpn vccv bfd-cv-negotiation ach-fault-detection-only peer <peer-address> enable command sets the BFD CV Type to 0x10 for Label Mapping packets to be sent to a specified remote peer.
The mpls l2vpn vccv bfd-cv-negotiation fault-detection-only peer <peer-address> disable command restores the BFD CV Type to 0x08 for Label Mapping packets to be sent to a specified remote peer.
The undo mpls l2vpn vccv bfd-cv-negotiation { fault-detection-only | ach-fault-detection-only | detection-and-signaling } peer <peer-ip> command applies the global BFD CV Type to Label Mapping packets to be sent to a specified remote peer.

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 only to static 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 remote peer at 10.10.10.10.

<HUAWEI> system-view
[~HUAWEI] mpls
[*HUAWEI-mpls] quit
[*HUAWEI] mpls l2vpn
[*HUAWEI-l2vpn] mpls l2vpn vccv bfd-cv-negotiation ach-fault-detection-only peer 10.10.10.10 enable

# Specify the BFD CV Type as 0x04 for Label Mapping packets to be sent to remote peer at 10.10.10.10.

<HUAWEI> system-view
[~HUAWEI] mpls
[*HUAWEI-mpls] quit
[*HUAWEI] mpls l2vpn
[*HUAWEI-l2vpn] mpls l2vpn vccv bfd-cv-negotiation fault-detection-only peer 10.10.10.10 enable