isis ldp-sync block

Function

The isis ldp-sync block command blocks synchronization between LDP and IS-IS on an interface.

The undo isis ldp-sync block command restores the default setting.

By default, synchronization between LDP and IS-IS is not blocked on an interface.

Format

isis ldp-sync block

undo isis ldp-sync block

Parameters

None

Views

Interface view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

The ldp-sync enable command run in the IS-IS view on a device 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, run the isis ldp-sync block command to block synchronization between LDP and IS-IS on the IS-IS interface that transmits important services.

Prerequisites

The IS-IS process has been started using the isis enable command in the interface view.

Example

# Block synchronization between LDP and IS-IS on VLANIF100.

<HUAWEI> system-view
[HUAWEI] interface vlanif 100
[HUAWEI-Vlanif100] isis enable 1
[HUAWEI-Vlanif100] isis ldp-sync block

# Block synchronization between LDP and IS-IS on GE0/0/1.

<HUAWEI> system-view
[HUAWEI] interface gigabitethernet 0/0/1
[HUAWEI-GigabitEthernet0/0/1] undo portswitch
[HUAWEI-GigabitEthernet0/0/1] isis enable 1
[HUAWEI-GigabitEthernet0/0/1] isis ldp-sync block