timer ldp-sync hold-down

Function

The timer ldp-sync hold-down command sets the Hold-down time for all IS-IS interfaces within an IS-IS process so that these interfaces remain in the Hold-down state before LDP sessions are established.

The undo timer ldp-sync hold-down command restores the default Hold-down time.

The default Hold-down time is 10 seconds.

Format

timer ldp-sync hold-down value

undo timer ldp-sync hold-down

Parameters

Parameter	Description	Value
value	Specifies the period of time during which all IS-IS interfaces within an IS-IS process remain in the Hold-down state before LDP sessions are established.	The value is an integer ranging from 0 to 65535, in seconds.

Views

IS-IS view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

If an active link between two devices enabled with synchronization between LDP and IS-IS recovers from a fault, the IS-IS module enters the Hold-down state and starts a Hold-down timer. This timer allows the devices to create an LDP session and set up an IS-IS neighbor relationship at the same time. Traffic can be switched back to the active link over a reachable IS-IS route for an established LDP LSP.

To set the Hold-down time for all interfaces within an IS-IS process, run the timer ldp-sync hold-down command.

Precautions

If both the timer ldp-sync hold-down command and the isis timer ldp-sync hold-down command in the interface view are executed, the isis timer ldp-sync hold-down command takes effect.

Example

# Set the Hold-down time for all interfaces within an IS-IS process 100 to 15 seconds.

<HUAWEI> system-view
[HUAWEI] isis 100
[HUAWEI-isis-100] timer ldp-sync hold-down 15