graceful-delete timer

Function

The graceful-delete timer command sets a period of time to retain upstream labels if an LDP session goes Down.

The undo graceful-delete timer command restores the default time.

The default period of time is 5 seconds.

Format

graceful-delete timer timer

undo graceful-delete timer

Parameters

Parameter	Description	Value
timer	Sets the period of time to retain upstream labels after an LDP session goes Down.	The value is an integer ranging from 1 to 65535, in seconds.

Parameter

Description

Value

timer

Sets the period of time to retain upstream labels after an LDP session goes Down.

The value is an integer ranging from 1 to 65535, in seconds.

Views

MPLS-LDP view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
mpls-ldp	write

Usage Guidelines

Usage Scenario

On an MPLS network where both active and standby links are used and LDP-IGP synchronization is enabled, graceful LDP deletion allows upstream labels to retain a specified period of time after an LDP session goes Down. This allows traffic to switch to a new LSP over the standby link without upstream labels re-assigned, minimizing the traffic interruption time. The graceful-delete timer command is used to set a period of time to retain upstream labels after an LDP session goes Down.

Prerequisites

Graceful LDP deletion has been enabled globally.

Follow-up Procedure

After configuring a period of time to retain upstream labels if an LDP session goes Down, run the display mpls ldp command to verify the configuration.

Precautions

Setting a small value is recommended, preventing labels for the faulty LSP from retaining for a long period of time.

Example

# Retain upstream labels 10 seconds after an LDP session goes Down.

<HUAWEI> system-view
[~HUAWEI] mpls
[*HUAWEI-mpls] quit
[*HUAWEI] mpls ldp
[*HUAWEI-mpls-ldp] graceful-delete
[*HUAWEI-mpls-ldp] graceful-delete timer 10