isis bfd enable

Function

The isis bfd enable command enables BFD on a specified IS-IS interface.

The undo isis bfd enable command disables BFD on a specified IS-IS interface.

By default, BFD is not enabled on an IS-IS interface.

Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this command.

Format

isis bfd enable

undo isis bfd enable

Parameters

None

Views

Interface view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

BFD can provide millisecond-level fault detection, help IS-IS to detect the faults that occur on neighboring devices or links more rapidly, and instruct IS-IS to recalculate routes for correct packet forwarding. The isis bfd enable command can be used to enable BFD on a specified IS-IS interface and establish BFD sessions by using default parameters.

Prerequisites

IS-IS has been enabled on the interface using the isis enable command.

Precautions

If global BFD is not enabled, you can configure BFD parameters on an interface but cannot establish a BFD session.

The BFD priority of the interface is higher than the BFD priority of the process. If BFD of the interface is enabled, the BFD session is set up based on the BFD parameters on the interface.

If the isis bfd block, isis bfd enable, and isis bfd static commands are run, only the last command takes effect.

Example

# Enable BFD on VLANIF100.

<HUAWEI> system-view
[HUAWEI] isis
[HUAWEI-isis-1] network-entity 01.0000.0000.0001.00
[HUAWEI-isis-1] quit
[HUAWEI] interface vlanif 100
[HUAWEI-Vlanif100] isis enable 1
[HUAWEI-Vlanif100] isis bfd enable

# Enable BFD on GE0/0/1.

<HUAWEI> system-view
[HUAWEI] isis
[HUAWEI-isis-1] network-entity 01.0000.0000.0001.00
[HUAWEI-isis-1] quit
[HUAWEI] interface gigabitethernet 0/0/1
[HUAWEI-GigabitEthernet0/0/1] undo portswitch
[HUAWEI-GigabitEthernet0/0/1] isis enable 1
[HUAWEI-GigabitEthernet0/0/1] isis bfd enable