backup access-link track bfd peer

Function

The backup access-link track bfd peer command configures a vBRAS-UP to track the status of a BFD session to detect access-side faults.

The undo backup access-link track bfd peer command restores the default configuration.

By default, a vBRAS-UP is not configured to track the status of a BFD session.

This command is supported only on the NetEngine 8000 F1A.

Format

backup access-link track bfd bfd-name peer

undo backup access-link track bfd bfd-name peer

Parameters

Parameter	Description	Value
bfd bfd-name	Specifies the name of a BFD session.	The value is a string of 1 to 64 characters.

Parameter

Description

Value

bfd bfd-name

Specifies the name of a BFD session.

The value is a string of 1 to 64 characters.

Views

CU-agent view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bras-control	write

Usage Guidelines

Usage Scenario

In the CU separation UP dual-device hot backup scenario, if link 1 between two switches goes Down, the vBRAS-CP cannot detect the Down event and therefore do not switch traffic to the secondary link. As a result, traffic is overloaded or lost. To enable the vBRAS-CP to detect access-side link faults, configure peer BFD association so that a vBRAS-UP tracks the BFD session status to detect access-side link faults.

Prerequisites

A BFD session has been created using the bfd bind peer-ip command in the system view.

Configuration Impact

After the backup access-link track bfd command is run, if the BFD session is Down and the states of two vBRAS-UP's access-side interfaces are both Up, each vBRAS-UP sends a request message for becoming the master device to the vBRAS-CP. As a result, two master devices exist, and two switches' users go online through their connected vBRAS-UPs, respectively.

Precautions

In VS mode, this command is supported only by the admin VS.

Example

# Configure a vBRAS-UP to track the status of a BFD session named test.

<HUAWEI> system-view
[~HUAWEI] cu-agent
[~HUAWEI-cu-agent] backup access-link track bfd test peer