graceful-delete

Function

The graceful-delete command enables graceful LDP deletion.

The undo graceful-delete command disables graceful LDP deletion.

By default, graceful LDP deletion is disabled.

Format

graceful-delete

undo graceful-delete

Parameters

None

Views

MPLS-LDP view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
mpls-ldp	write

Usage Guidelines

Usage Scenario

On a network where both active and standby links are used and IGP-LDP synchronization is enabled, if an LDP session goes Down, upstream labels are withdrawn to delete an LSP, and IGP-LDP synchronization switches traffic to a new LSP established over the standby link using newly assigned labels. The traffic restoration is delayed. To speed up traffic restoration, graceful LDP deletion is used together with IGP-LDP synchronization. If an LDP session goes Down, upstream labels are not withdrawn during IGP convergence, and a new LSP is established over the standby link using these upstream labels, minimizing the traffic interruption time.

Prerequisites

MPLS LDP has been enabled globally using the mpls ldp command.

Configuration Impact

After the graceful-delete command is used, upstream labels are not withdrawn during IGP convergence if an LDP session goes Down, minimizing the traffic interruption time.

Follow-up Procedure

Run the graceful-delete timer command to set the time to retain upstream labels.

Example

# Enable graceful LDP deletion.

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