(Optional) Blocking Synchronization Between LDP and IS-IS on an Interface

This section describes how to block synchronization between LDP and IS-IS on an interface.

Context

The ldp-sync enable command run in an IS-IS process enables synchronization between LDP and IS-IS on all local IS-IS interfaces. On an IS-IS interface transmits importance services, LDP and IS-IS synchronization may affect service transmission. If the link is working properly and an LDP session over the link fails, IS-IS sends link state PDUs (LSPs) to advertise the maximum cost of the link. As a result, IS-IS does not select the route for the link, which affects important service transmission.

To prevent the preceding problem, block LDP and IS-IS synchronization on an IS-IS interface that transmits important services.

Procedure

Access the system view.
```
system-view
```
Access the view of an IS-IS-enabled interface.
```
interface interface-type interface-number
```
Block synchronization between LDP and IS-IS on an interface.
```
isis ldp-sync block
```