ais link-status

Function

The ais link-status command enables alarm indication signal (AIS) to monitor an interface.

The undo ais link-status command disables AIS from monitoring an interface.

By default, AIS does not monitor an interface.

Format

ais link-status interface { interface-name | interface-type interface-number }

undo ais link-status interface { interface-name | interface-type interface-number }

Parameters

Parameter	Description	Value
interface interface-type interface-number	Specifies the type and number of an interface to be monitored by AIS.	-

Parameter

Description

Value

interface interface-type interface-number

Specifies the type and number of an interface to be monitored by AIS.

Views

MA view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
y1731	write

Usage Guidelines

Usage Scenario

In MD nesting scenarios, if the MEP of a low-level MD detects a fault, the MEP sends an alarm to the NMS. After a specified period elapses, if the MEP of a high-level MD also detects the fault, the MEP sends an alarm that is the same as the one sent by the MEP of the low-level MD to the NMS. In this case, the MEP of the high-level MD needs to be suppressed from sending alarms to the NMS. You can enable the AIS function for the low-level and high-level MDs.

To speed up the sending of AIS packets, run the ais link-status command to configure AIS to monitor interfaces. A MEP sends an AIS packet immediately after the monitored interface goes Down, instead of waiting for the timeout of continuity check messages (CCMs). This suppresses the MEP in a high-level MD from sending the same alarm to the NMS.

Prerequisites

An MD has been created using the cfm md command.
An MA has been created using the ma command.
The AIS function has been enabled using the ais enable command.

Precautions

In an MD:

Both inward- and outward-facing MEPs can receive AIS packets.
Outward-facing MEPs can send AIS along PWs, and inward-facing MEPs can send AIS packets along ACs.

Example

# Create an MD named md1, create an MA named ma1, and configure AIS to monitor GE 0/1/1 in ma1.

<HUAWEI> system-view
[~HUAWEI] cfm enable
[*HUAWEI] cfm md md1
[*HUAWEI-md-md1] ma ma1
[*HUAWEI-md-md1-ma-ma1] ais enable
[*HUAWEI-md-md1-ma-ma1] ais link-status interface GigabitEthernet0/1/1