seamless-bfd enable mode tunnel

Function

The seamless-bfd enable mode tunnel command configures seamless bidirectional forwarding detection (SBFD) for SR-MPLS BE tunnels.

The undo seamless-bfd enable mode tunnel command deletes the SBFD function for SR-MPLS BE tunnels.

By default, the SBFD function is disabled for SR-MPLS BE tunnels.

Format

seamless-bfd enable mode tunnel [ [ filter-policy ip-prefix ip-prefix-name ] | [ effect-sr-lsp ] ] ^*

undo seamless-bfd enable mode tunnel [ [ filter-policy ip-prefix ip-prefix-name ] | [ effect-sr-lsp ] ] ^*

Parameters

Parameter	Description	Value
filter-policy	Indicates a filter policy.	-
ip-prefix ip-prefix-name	Specifies an IP prefix list.	The name is a string of 1 to 169 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string.
effect-sr-lsp	Specify whether to affect the SR LSP. If the effect-sr-lsp parameter is specified, if SBFD Down, SEGR module cancels the SR LSP.	-

Parameter

Description

Value

filter-policy

Indicates a filter policy.

ip-prefix ip-prefix-name

Specifies an IP prefix list.

The name is a string of 1 to 169 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string.

effect-sr-lsp

Specify whether to affect the SR LSP.

If the effect-sr-lsp parameter is specified, if SBFD Down, SEGR module cancels the SR LSP.

Views

Segment routing view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
segr	write

Usage Guidelines

Usage Scenario

Bidirectional forwarding detection (BFD) techniques are mature. When a large number of BFD sessions are configured to monitor links, the negotiation time of the existing BFD state machine is lengthened. In this situation, seamless bidirectional forwarding detection (SBFD) can be configured to monitor SR tunnels. It is a simplified BFD state machine that shortens the negotiation time and improves network-wide flexibility. To enable SBFD to monitor SR-MPLS BE tunnels, run the seamless-bfd enable command.

Prerequisites

BFD and SBFD have been enabled using the bfd and sbfd commands, respectively.

Example

# Enable SBFD to monitor SR-MPLS BE tunnels.

<HUAWEI> system-view
[~HUAWEI] bfd
[*HUAWEI-bfd] quit
[*HUAWEI] sbfd
[*HUAWEI-sbfd] quit
[*HUAWEI] segment-routing
[*HUAWEI-segment-routing] seamless-bfd enable mode tunnel