(Optional) Setting the Hold-down Timer Value

This section describes how to set the hold-down timer. The timer is an interval during which an interface waits for the setup of an LDP session without setting up an IGP neighbor relationship.

Context

On a device that has LDP-IGP synchronization enabled, if the active physical link recovers, an IGP enters the Hold-down state, and a Hold-down timer starts. Before the Hold-down timer expires, the IGP delays establishing an IGP neighbor relationship until an LDP session is established over the active link so that the LDP session over and IGP route for the active link can become available simultaneously.

If IS-IS is used, you can set the value of the Hold-down timer on a specified interface or set the value of the Hold-down timer for all IS-IS interfaces in the IS-IS view.

If different Hold-down values on an interface and in an IS-IS process are set, the setting on the interface takes effect.

Procedure

If OSPF is used as an IGP, perform the following steps on an interface:
1. Access the system view.
```
system-view
```
2. Access the interface view.
```
interface interface-type interface-number
```
3. Set the Hold-down timer to enable an OSPF interface to delay establishing an OSPF neighbor relationship until an LDP session is established.
```
ospf timer ldp-sync hold-down value
```
  The default Hold-down time is 10s.
If IS-IS is used as an IGP, perform the following steps:
Set the Hold-down timer on a specified IS-IS interface.
1. Access the system view.
```
system-view
```
2. Access the interface view.
```
interface interface-type interface-number
```
3. Set the Hold-down timer to enable an IS-IS interface to delay establishing an IS-IS neighbor relationship until an LDP session is established.
```
isis timer ldp-sync hold-down value
```
  The default Hold-down time is 10s.
Set the Hold-down timer on all IS-IS interfaces in a specified IS-IS process.
1. Access the system view.
```
system-view
```
2. Access the IS-IS process view.
```
isis [ process-id ]
```
3. Set the Hold-down timer to enable all IS-IS interfaces within an IS-IS process to delay establishing IS-IS neighbor relationships until LDP sessions are established.
```
timer ldp-sync hold-down value
```
  The default Hold-down time is 10s.