(Optional) Configuring Delayed Transmission of Label Withdraw Messages

The label withdraw delay function prevents the entire LDP LSP from flapping.

Context

An LSP on a local node flaps because an LDP session between the node and its downstream peer flaps, a route flaps, or an LDP policy is modified. The local node repeatedly sends Label Withdraw and Label Mapping messages in sequence to upstream nodes. This causes the upstream nodes to repeatedly tear down and reestablish LSPs. As a result, the entire LDP LSP flaps. The label withdraw delay function prevents the entire LDP LSP from flapping.

Procedure

Access the system view.
```
system-view
```
Access the MPLS-LDP view.
```
mpls ldp
```
Enable the label withdraw delay function.
```
label-withdraw-delay
```
By default, the label withdraw delay function is disabled.
Set the delay time for a Label Withdraw message to be sent.
```
label-withdraw-delay timer  time
```
The default delay time is 5 seconds.