pw-aps (System view)

Function

The pw-aps command creates a PW APS instance.

The undo pw-aps command deletes a PW APS instance.

By default, no PW APS instance is configured in the system.

Format

pw-aps apsId [ frr ]

undo pw-aps apsId [ frr ]

Parameters

Parameter	Description	Value
apsId	Specifies the number of a PW APS instance on the local end.	The value is an integer ranging from 1 to 16384.
frr	Indicates pseudowire Fast Protection Switching (PW FPS) for VPWS reliability.In dual-homing protection scenarios where E-LAN services are deployed,PW FPS can be configured for VPWS reliability. PW FPS is the single-ended switching mode of PW APS. When PW FPS is used, the PEs at the two ends of a PW do not exchange APS negotiation packets. Instead, they select the primary and secondary PWs based on the local PW priority and PW OAM detection status.	-

Parameter

Description

Value

apsId

Specifies the number of a PW APS instance on the local end.

The value is an integer ranging from 1 to 16384.

frr

Indicates pseudowire Fast Protection Switching (PW FPS) for VPWS reliability.In dual-homing protection scenarios where E-LAN services are deployed,PW FPS can be configured for VPWS reliability. PW FPS is the single-ended switching mode of PW APS. When PW FPS is used, the PEs at the two ends of a PW do not exchange APS negotiation packets. Instead, they select the primary and secondary PWs based on the local PW priority and PW OAM detection status.

Views

System view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
l2vpn	write

Usage Guidelines

Usage Scenario

PW APS can be used to ensure the reliability of LDP and SVC PWs. In PW APS networking, the PW APS instance status determines the protection switching in a PW protection group. Therefore, you need to run the pw-aps command to create a PW APS instance first.

Prerequisites

MPLS and MPLS L2VPN have been enabled in the system view.

Configuration Impact

If you run the undo pw-aps command to delete a PW APS instance that has been associated with PW protection groups, an interactive prompt will be displayed, requiring your confirmation. Enter Y if you want to dissociate the PW APS instance from the PW protection groups and delete the PW APS instance. Enter N if you want to cancel the operation and retain the association.

Follow-up Procedure

Configure the attributes of a PW APS instance as needed, such as its description, switchback mode, WTR time, manual operation, and switching delay time.

In an E-PW APS scenario, you need to run the role and remote-aps commands to configure inter-device protection.

Precautions

The default role of a PW APS instance is PW APS. In an E-PW APS scenario, you need to run the role command to specify the master or slave role for a PW APS instance.

If a PW APS instance has been bound to PW protection groups, deleting the PW APS instance causes all the binding relationships between the PW APS instance and the PW protection groups to be removed. Therefore, exercise caution when performing this operation.

Only the NetEngine 8000 F1A supports this command.

Example

# Create a PW APS instance numbered 1 (in single-ended PW APS mode) in the system view.

<HUAWEI> system-view
[~HUAWEI] mpls
[*HUAWEI-mpls] quit
[*HUAWEI] mpls l2vpn
[*HUAWEI-l2vpn] quit
[*HUAWEI] pw-aps 1 frr

# Create a PW APS instance numbered 1 in the system view.

<HUAWEI> system-view
[~HUAWEI] mpls
[*HUAWEI-mpls] quit
[*HUAWEI] mpls l2vpn
[*HUAWEI-l2vpn] quit
[*HUAWEI] pw-aps 1