graceful-delete (MPLS-LDP-VPN instance view)

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-VPN instance 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and standby links are used and IGP-LDP synchronization is enabled, if an LDP session goes Down, upstream labels are withdrawn to delete an LSP, and IGP-LDP synchronization switches traffic to a new LSP established over the standby link using newly assigned labels.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 If an LDP session goes Down, upstream labels are not withdrawn during IGP convergence, and a new LSP is established over the standby link using these upstream labels, minimizing the traffic interruption time.

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After the graceful-delete command is used, upstream labels are not withdrawn during IGP convergence if an LDP session goes Down, minimizing the traffic interruption time.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

<HUAWEI> system-view
[~HUAWEI] mpls
[~HUAWEI-mpls] quit
[~HUAWEI] mpls ldp vpn-instance vpn1
[~HUAWEI-mpls-ldp-vpn-instance-vpn1] graceful-delete