discriminator (BFD session view)

Function

The discriminator command sets the local and remote discriminators of a static BFD session.

The undo discriminator command deletes the local and remote discriminators of a static BFD session.

By default, the discriminator of a static BFD session is not created.

Format

discriminator local discr-value

discriminator remote discr-value

undo discriminator local

undo discriminator remote

Parameters

Parameter	Description	Value
remote discr-value	Specifies the remote discriminator of a BFD session.	The value is an integer ranging from 1 to 4294967295.
local discr-value	Specifies the local discriminator of a BFD session.	The value is an integer ranging from 1 to 16384.

Parameter

Description

Value

remote discr-value

Specifies the remote discriminator of a BFD session.

The value is an integer ranging from 1 to 4294967295.

local discr-value

Specifies the local discriminator of a BFD session.

The value is an integer ranging from 1 to 16384.

Views

BFD session view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bfd	write

Usage Guidelines

Usage Scenario

During the establishment of a static BFD session, you must run the discriminator command to set the local and remote discriminators of the static BFD session; otherwise, the static BFD session cannot be established.

Discriminators identify different BFD sessions between virtual systems (VSs). During the negotiation of the BFD session, the two ends of the BFD session need to negotiate on the local and remote discriminators.

Prerequisites

A BFD session has been created.

Configuration Impact

Once the local and remote identifiers for the static BFD session are configured successfully, they can be modified.

Precautions

Only a static BFD session requires local and remote discriminators.
In a BFD session, the local discriminator of the local end must be the same as the remote discriminator of the remote end, and the remote discriminator of the local end must be the same as the local discriminator of the remote end. Otherwise, the BFD session cannot go Up.
The local discriminators of different virtual systems (VSs) must be different; otherwise, an error message will be displayed.
The local and remote discriminators set for a static BFD session can be changed.
Do not configure the same remote discriminator and local discriminator for different sessions on a device. - When a BFD session is Up, changing the local or remote discriminator causes the session to enter the administratively Down state. The BFD session recovers automatically without manual intervention.

Example

# Set the local discriminator of the BFD session to 80 and the remote discriminator to 800.

<HUAWEI> system-view
[~HUAWEI] bfd
[*HUAWEI-bfd] quit
[*HUAWEI] bfd s1 bind peer-ip 10.10.20.2
[*HUAWEI-session-s1] quit
[*HUAWEI] bfd s1
[*HUAWEI-bfd-session-s1] discriminator local 80
[*HUAWEI-bfd-session-s1] discriminator remote 800